PWA offers app-like experience with features like offline access, installation, push notifications, while a web app is accessed via browser with internet connection.

PWA vs Web App: Key Differences and Which One to Choose?

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PWA vs Web App: Key Differences, Use Cases & How to Choose

TanStack Router has end-to-end type safety (params/search params) with route-first data loading, while React Router offers nested routes and error boundaries.

TanStack Router vs React Router: Which One Fits Your App?

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TanStack Router vs React Router: Which One is Better?

AI assistants need a standard way to call into your app to run a report, fetch status, create a ticket. Building a custom integration per vendor doesn't scale. The <a href="https://reliasoftware.com/blog/what-is-model-context-protocol" rel="dofollow">Model Context Protocol (MCP)</a> gives you one contract: tools, resources, and prompts that any MCP client can discover and call.&nbsp;
This guide is practical: you'll build a minimal MCP server and a React client that talks to it, using the stack you already use (Next.js, Vite + Express, or browser-only). By the end you'll have a runnable server, a React UI that invokes tools, and a clear path to production.
A small note that just keep using <a href="https://reliasoftware.com/blog/react-server-actions" rel="nofollow">React Server Actions</a> or your framework's data layer for normal user-facing data. MCP is for the AI-facing surface.
&gt;&gt;&nbsp;Read more: How to <a href="https://reliasoftware.com/blog/react-chatbot-ui" rel="dofollow">Build a React Chatbot UI with Vite, Tailwind, Shadcn</a>?
<h2>What You'll Build?</h2>
You'll build two pieces:
<ol>
<li>A minimal MCP-style server (Node): one HTTP server that exposes two tools (e.g. <code>get_status</code> and <code>run_report</code>). Each tool accepts arguments and returns a result in the usual MCP content shape. You run it once (e.g. on port 3001).</li>
<li>A React app that calls those tools: a button or form that sends a request (tool name + arguments) and displays the response. How the request gets to the server depends on the method:
<ul>
<li>Method 1 (Next.js): React calls a Next.js API route; the route proxies the request to the MCP server.</li>
<li>Method 2 (Vite + Express): React (Vite) calls an Express server; Express proxies to the MCP server.</li>
<li>Method 3 (Browser-only): React calls the MCP server directly over HTTP (CORS must allow your app origin).</li>
</ul>
</li>
</ol>
The server we build is minimal on purpose: it uses a simple HTTP JSON API that mirrors the MCP tool response shape for learning. It is not a full MCP server (real MCP uses JSON-RPC 2.0 over stdio or HTTP). When you're ready, swap it for a full <a href="https://github.com/modelcontextprotocol/sdk">MCP SDK</a> server and keep the same client-side pattern.
&gt;&gt;&nbsp;Explore further: How to <a href="https://reliasoftware.com/blog/nodejs-chatbot-ai">Build a Node.js Chatbot Backend with Express and OpenAI</a>?
<h2>Prerequisites</h2>
<ul>
<li>Node.js 18+ and npm (or pnpm).</li>
<li>Basic React (components, <code>useState</code>, <code>fetch</code>).</li>
<li>One of: Next.js (App Router), Vite + Express, or a plain <a href="https://reliasoftware.com/blog/how-to-create-react-app-using-vite">Vite React app</a> for the browser-only method.</li>
</ul>
&gt;&gt;&nbsp;You might need: A Full Guide to <a href="https://reliasoftware.com/blog/migrate-react-router-to-tanstack-router">Migrate from React Router to TanStack Router</a>
<h2>Build the Minimal MCP Server</h2>
Create a small Node project that exposes two tools over HTTP. The response shape mirrors the MCP tool result format (<code>{ content: [{ type: "text", text: "&hellip;" }] }</code>)&mdash;useful for learning, though real MCP clients use JSON-RPC 2.0 (see the SDK link below).
<h3>Step 1:&nbsp;Create the project</h3>
<pre class="language-javascript"><code>mkdir mcp-server &amp;&amp; cd mcp-server
npm init -y
npm install express cors</code></pre>
<h3>Step 2: Add the server file</h3>
Create <code>server.mjs</code> (we use the <code>.mjs</code> extension so Node treats it as an ES module; if you prefer <code>server.js</code>, add <code>"type": "module"</code> to your <code>package.json</code>):
<pre class="language-javascript"><code>import express from "express";
import cors from "cors";

const app = express();
app.use(cors());
app.use(express.json());

const tools = {
 get_status() {
 return { content: [{ type: "text", text: "OK &ndash; server is running. Time: " + new Date().toISOString() }] };
 },
 run_report({ scope = "week" } = {}) {
 const report = `Report (${scope}): generated at ${new Date().toISOString()}. Add your real logic here.`;
 return { content: [{ type: "text", text: report }] };
 },
};

app.post("/mcp/tools", (req, res) =&gt; {
 const { name, arguments: args } = req.body || {};
 const fn = tools[name];
 if (!fn) {
 return res.status(400).json({ error: "Unknown tool", content: [{ type: "text", text: "Unknown tool: " + name }] });
 }
 try {
 const result = tools[name](args || {});
 res.json(result);
 } catch (e) {
 res.status(500).json({ content: [{ type: "text", text: "Error: " + e.message }] });
 }
});

const PORT = 3001;
app.listen(PORT, () =&gt; console.log("MCP server on &lt;http://localhost&gt;:" + PORT));</code></pre>
<h3>Step 3: Run it</h3>
<pre class="language-javascript"><code>node server.mjs</code></pre>
Leave it running. You'll point your React app (or proxy) at <code>http://localhost:3001/mcp/tools</code> with POST body <code>{ "name": "get_status", "arguments": {} }</code> or <code>{ "name": "run_report", "arguments": { "scope": "week" } }</code>.
<blockquote>
Pro Tip: For production you'd use the official MCP SDK (stdio or HTTP transport) and register tools with proper schemas. This minimal server keeps the tutorial focused on the React side.
</blockquote>
<h2>3 Methods to Integrate MCP Tools into a React UI</h2>
<h3>Method 1: Next.js (API Route Proxy)</h3>
Most <a href="https://reliasoftware.com/blog/what-is-next-js">React apps use Next.js</a>. Here the browser never talks to the MCP server directly; it calls a Next.js API route that forwards the request.
1. Create the Next app
<pre class="language-javascript"><code>npx create-next-app@latest my-mcp-app --typescript --app --no-src-dir
cd my-mcp-app</code></pre>
2. Add the API route
Create <code>app/api/mcp/tools/route.ts</code>:
<pre class="language-javascript"><code>import { NextRequest, NextResponse } from "next/server";

const MCP_SERVER = process.env.MCP_SERVER_URL ?? "&lt;http://localhost:3001&gt;";

export async function POST(request: NextRequest) {
 const body = await request.json();
 try {
 const res = await fetch(`${MCP_SERVER}/mcp/tools`, {
 method: "POST",
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify(body),
 });
 if (!res.ok) {
 return NextResponse.json({ error: "MCP server error" }, { status: res.status });
 }
 const data = await res.json();
 return NextResponse.json(data);
 } catch {
 return NextResponse.json({ error: "MCP server unreachable" }, { status: 502 });
 }
}</code></pre>
3. Add a page that calls the route
In <code>app/page.tsx</code> (or a new page):
<pre class="language-javascript"><code>"use client";

import { useState } from "react";

type MCPResult = { content?: Array&lt;{ type: string; text?: string }&gt; };

async function callMCPTool(name: string, args: Record&lt;string, unknown&gt; = {}): Promise&lt;string&gt; {
 const res = await fetch("/api/mcp/tools", {
 method: "POST",
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ name, arguments: args }),
 });
 if (!res.ok) throw new Error("MCP call failed");
 const data: MCPResult = await res.json();
 return data.content?.[0]?.text ?? "";
}

export default function Home() {
 const [result, setResult] = useState&lt;string | null&gt;(null);
 const [loading, setLoading] = useState(false);

 const handleGetStatus = async () =&gt; {
 setLoading(true);
 try {
 const text = await callMCPTool("get_status");
 setResult(text);
 } finally {
 setLoading(false);
 }
 };

 const handleRunReport = async () =&gt; {
 setLoading(true);
 try {
 const text = await callMCPTool("run_report", { scope: "week" });
 setResult(text);
 } finally {
 setLoading(false);
 }
 };

 return (
 &lt;main style={{ padding: "2rem" }}&gt;
 &lt;h1&gt;React + MCP (Next.js)&lt;/h1&gt;
 &lt;div style={{ display: "flex", gap: "0.5rem", marginBottom: "1rem" }}&gt;
 &lt;button type="button" onClick={handleGetStatus} disabled={loading}&gt;
 Get status
 &lt;/button&gt;
 &lt;button type="button" onClick={handleRunReport} disabled={loading}&gt;
 Run report
 &lt;/button&gt;
 &lt;/div&gt;
 {result != null &amp;&amp; &lt;pre style={{ background: "#f4f4f4", padding: "1rem" }}&gt;{result}&lt;/pre&gt;}
 &lt;/main&gt;
 );
}</code></pre>
4. Run both
<ul>
<li>Terminal 1: <code>node server.mjs</code> (from the MCP server folder).</li>
<li>Terminal 2: <code>npm run dev</code> in the Next app. Set <code>MCP_SERVER_URL=http://localhost:3001</code> if the server is not on the same host.</li>
</ul>
So: the browser only sees <code>/api/mcp/tools</code>. Your Next.js backend owns auth, rate limiting, and logging before calling the MCP server.
<h3>Method&nbsp;2: Vite + Express (Express Proxy)</h3>
If your stack is Vite for the frontend and Express for the backend, run the React app and Express on different ports; Express proxies to the MCP server.
1. Create Vite React app
<pre class="language-javascript"><code>npm create vite@latest my-mcp-client -- --template react-ts
cd my-mcp-client
npm install</code></pre>
2. Install proxy dependencies and create the Express proxy
In the same repo or a sibling folder, install Express and CORS for the proxy, then add a small server file (e.g. <code>server.mjs</code> in the project root or in a <code>server/</code> folder):

<pre class="language-javascript"><code>npm install express cors</code></pre>
<pre class="language-javascript"><code>import express from "express";
import cors from "cors";

const app = express();
app.use(cors({ origin: "&lt;http://localhost:5173&gt;" }));
app.use(express.json());

const MCP_SERVER = process.env.MCP_SERVER_URL ?? "&lt;http://localhost:3001&gt;";

app.post("/api/mcp/tools", async (req, res) =&gt; {
 try {
 const r = await fetch(`${MCP_SERVER}/mcp/tools`, {
 method: "POST",
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify(req.body),
 });
 if (!r.ok) return res.status(r.status).json({ error: "MCP server error" });
 const data = await r.json();
 res.json(data);
 } catch {
 res.status(502).json({ error: "MCP server unreachable" });
 }
});

app.listen(3002, () =&gt; console.log("Proxy on &lt;http://localhost:3002&gt;"));</code></pre>
3. <a href="https://reliasoftware.com/blog/react-component-library">React component</a>
In <code>src/App.tsx</code>, reuse the same component markup from method 1&mdash; only <code>callMCPTool</code> changes (point it to the Express proxy on port 3002):

<pre class="language-javascript"><code>const API = "&lt;http://localhost:3002/api/mcp/tools&gt;";

async function callMCPTool(name: string, args: Record&lt;string, unknown&gt; = {}): Promise&lt;string&gt; {
 const res = await fetch(API, {
 method: "POST",
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ name, arguments: args }),
 });
 if (!res.ok) throw new Error("MCP call failed");
 const data = await res.json();
 return data.content?.[0]?.text ?? "";
}</code></pre>
Run the MCP server on 3001, the proxy on 3002, and Vite on 5173. The React app only talks to 3002; Express adds a single place for auth and rate limiting.
<h3>Method 3: Browser-Only (Direct HTTP + CORS)</h3>
For local dev or demos, React can call the MCP server directly if the server allows your app's origin. The minimal server in the previous section already uses <code>cors()</code> with no origin restriction, so it will accept requests from any origin (suitable only for development).
1. Use the same MCP server (with <code>cors()</code> enabled).
2. Create a Vite React app (or any React app) and call the server URL:
<pre class="language-javascript"><code>const MCP_URL = "&lt;http://localhost:3001&gt;";

async function callMCPTool(name: string, args: Record&lt;string, unknown&gt; = {}): Promise&lt;string&gt; {
 const res = await fetch(`${MCP_URL}/mcp/tools`, {
 method: "POST",
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ name, arguments: args }),
 });
 if (!res.ok) throw new Error("MCP call failed");
 const data = await res.json();
 return data.content?.[0]?.text ?? "";
}</code></pre>
3. Run the server and the app. Open the app in the browser (e.g. <code>http://localhost:5173</code>). Buttons that call <code>callMCPTool("get_status")</code> and <code>callMCPTool("run_report", { scope: "week" })</code> will work as long as the server is on 3001 and CORS allows the page origin.
<blockquote>
Warning: Do not expose this setup to the internet without auth and a strict CORS policy. For production, use method 1 or 2 so the browser never talks to the MCP server directly.
</blockquote>
<h2>When to Use vs Not to Use MCP with React?</h2>
When to use with React:
<ul>
<li>You want Cursor, Copilot, or another client to trigger actions or read data from your app.</li>
<li>You prefer one standard integration instead of custom plugins per vendor.</li>
<li>You're building internal tools or dashboards that should be AI-friendly (e.g. "create ticket", "run report" as tools).</li>
</ul>
When not to: Your app is purely user-facing with no need for AI to call back, or you only call external AI APIs from React, use normal fetch or an SDK for that. MCP is for the AI-facing surface, not for replacing React Server Actions or your data layer.
<h2>FAQs</h2>
How is MCP different from a REST API?
A REST API is designed for app-to-app communication with custom endpoints you define. MCP is a standardised protocol that lets AI systems discover and call your tools automatically, one integration instead of one custom endpoint per vendor. See the&nbsp;<a href="https://modelcontextprotocol.io/">official MCP documentation</a> and the <a href="https://github.com/modelcontextprotocol">MCP SDK on GitHub</a> for the full spec.
Why use MCP with React?
So AI assistants can use your app's data and actions through one standard protocol instead of custom integrations per vendor.
Does React run the MCP server?
Usually not. The MCP server runs in Node or your backend. Your React app calls your own API (Next.js or Express), which then talks to the MCP server. That keeps auth and security in one place.
Is MCP production-ready?
The protocol is used in production by several vendors. Your implementation (auth, rate limiting, CORS) must be production-ready; the protocol does not enforce that for you.
How do I secure MCP in production?
Authenticate callers, use a backend proxy so the browser never talks to the MCP server directly, add rate limiting, and log tool calls for audit.
&gt;&gt;&nbsp;Read more: <a href="https://reliasoftware.com/blog/react-production-ready-ai-chatbot">Build A Production-Ready React AI Chatbot with Streaming, RAG, &amp; More</a>
Can I use MCP in the browser?
Yes, if the server is exposed over HTTP and CORS allows your origin. For production, prefer a backend proxy (method 1 or 2).
Does MCP replace my React data fetching?
No. MCP is for AI systems to call into your app. Use your normal data fetching (Server Actions, <a href="https://reliasoftware.com/blog/graphql-with-react">GraphQL</a>, fetch) for user-driven flows.
Why do tool descriptions matter?
LLMs use the tool's schema and description when deciding what to call. Clear descriptions and actionable error messages improve reliability.

<h2>Conclusion</h2>
You built a minimal MCP-style server and a React client that calls it via three patterns: Next.js API route proxy, Vite + Express proxy, or browser-only HTTP. Use the method that matches your stack; in production, use a proxy (Next.js or Express) and add auth, CORS, and rate limiting. Start with one or two tools, validate the flow, then expand.
Next Steps:
<ul>
<li>Swap to the official MCP SDK for full JSON-RPC 2.0 support, tool schemas, and resources/prompts.</li>
<li>Add SSE or streaming transport so tools can push progress updates to the client.</li>
<li>Register tools with JSON Schema descriptions so LLMs can discover and choose tools automatically.</li>
</ul>
<div id="article_content" class="inner_article__entries__X3PKd">
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!
</div>

Learn how to build a minimal MCP server and a React client that talks to it, using Next.js, Vite + Express, or browser-only with a clear path to production.

How to Build an MCP Server and Integrate it with a React App?

 Build an MCP Server and Integrate it with a React App

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React MCP Guide: Build an MCP Server and Connect It to a React UI

Moving an existing React Router app to TanStack Router can feel daunting, but you don't need a full rewrite. A TanStack Router migration done step-by-step: auditing routes and loaders, mappingg definitions, moving data loading, then searching params to keep risk low and let you ship incrementally.
This guide walks through when migration makes sense, how to audit and map your current setup, how to migrate loaders and search params, and how to test and go-live. For setup and API (createRootRoute, createRoute, createRouter, loaders), see the&nbsp;<a href="https://tanstack.com/router/latest/docs" rel="noopener noreferrer">TanStack Router docs</a>.
&gt;&gt;&nbsp;You may need: <a href="https://reliasoftware.com/blog/tanstack-router-vs-react-router">TanStack Router vs React Router</a>: Which One is Better?
<h2>When Migration Makes Sense?</h2>
Migrate to TanStack Router when type-safe params and search, or integrated loaders and caching, would materially improve your app. You're already paying the cost of maintaining routes and loaders; moving to a single, typed route tree and first-class loaders can reduce bugs and simplify data flow.
Howerver, keep staying on React Router when your team is productive and you're not hitting type-safety or data-loading pain. Migration takes time; if the current setup works, defer. Use a framework (e.g. Next.js) when you need <a href="https://reliasoftware.com/blog/react-server-side-rendering-best-practices">server-side rendering</a>, file-based routing, or framework-specific features
<blockquote>
Key Takeaway: Migrate when the benefits (type safety, loader/cache DX) outweigh the cost. When in doubt, try one feature area (e.g. one section of routes) first.
</blockquote>
<h2>5 Steps to Migrate React Router app to TanStack Router</h2>
<h3>Step 1: Audit Your Current Routes and Loaders</h3>
Before changing code, list what you have. In a React Router app, routes are usually defined as a component tree (e.g. <code>createBrowserRouter</code> with <code>Route</code> elements). For each route, note:
<ul>
<li>Path (including dynamic segments, e.g. <code>/users/:userId</code>).</li>
<li>Loader: what it fetches and what it returns.</li>
<li>Dependencies: parent loaders, search params, or redirects.</li>
</ul>
Write a short table or doc: route path, component, loader signature, and any search params the route reads or sets. That becomes your migration map. Identify the root route and the nesting structure so you can mirror it in TanStack Router.
<blockquote>
Best Practice: Audit the routes you'll migrate first (e.g. one product area). Leave the rest on React Router until that slice is done, or plan a phased cutover.
</blockquote>
<h3>Step 2: Map Route Definitions: Component Tree vs Code/File-Based</h3>
React Router uses a component tree: you nest <code>&lt;Route&gt;</code> elements and pass <code>path</code>, <code>element</code>, and <code>loader</code>. TanStack Router uses code-based route definitions (or file-based with <code>@tanstack/router-vite-plugin</code>): you call <code>createRootRoute</code>, <code>createRoute</code>, and build a route tree with <code>addChildren</code>.
Map each React Router route to a TanStack route:
<ul>
<li>Root &rarr; <code>createRootRoute()</code>.</li>
<li>Each child route &rarr; <code>createRoute({ getParentRoute: () =&gt; parent, path: '&hellip;' })</code>.</li>
<li>Dynamic segments: in React Router you use <code>:id</code>; in TanStack Router you use <code>$id</code> (e.g. <code>/users/$userId</code>).</li>
</ul>
Example: from a React Router tree with <code>/</code>, <code>/users</code>, and <code>/users/:userId</code>, you get:
<pre class="language-typescript"><code>import { createRootRoute, createRoute, createRouter } from '@tanstack/react-router';

const rootRoute = createRootRoute();

const indexRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/',
});

const usersRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/users',
});

const userRoute = createRoute({
 getParentRoute: () =&gt; usersRoute,
 path: '$userId',
});

const routeTree = rootRoute
 .addChildren([indexRoute, usersRoute.addChildren([userRoute])]);

export const router = createRouter({ routeTree });
</code></pre>
The structure mirrors your current nesting; only the API shape changes. Use the same path strings so URLs stay identical. When migrating, lazy-load route components and <a href="https://reliasoftware.com/blog/react-suspense">add a Suspense boundary</a> at the route level so heavy screens don't block the initial bundle.
Optionally align route files with a feature-based layout (e.g.&nbsp;<code>routes/</code> with feature entry points) so the migrated app matches modern frontend structure.
<h3>Step 3: Migrate Loaders and Data Dependencies</h3>
In React Router, loaders are functions that receive <code>{ params, request }</code> and return data. In TanStack Router, loaders are attached to the route and receive a context that includes <code>params</code> (and search when you add validation). Move each loader body over and adapt the argument shape.
React Router example:
<pre class="language-typescript"><code>// React Router: loader on route
export async function loader({ params }: { params: { userId: string } }) {
 const res = await fetch(`/api/users/${params.userId}`);
 if (!res.ok) throw new Error('Failed to load user');
 return res.json();
}
</code></pre>
Move that logic into the route's <code>loader</code> in TanStack Router. The fetch and error handling stay the same; only the registration and param typing change.
TanStack Router equivalent:
<pre class="language-typescript"><code>const userRoute = createRoute({
 getParentRoute: () =&gt; usersRoute,
 path: '$userId',
 loader: async ({ params }) =&gt; {
 const res = await fetch(`/api/users/${params.userId}`);
 if (!res.ok) throw new Error('Failed to load user');
 return res.json() as Promise&lt;{ id: string; name: string }&gt;;
 },
});
</code></pre>
Keep the same fetch logic and error handling; only the way the loader is registered and how params are typed changes. During migration, ensure loaders that need multiple fetches use parallel requests (e.g. <code>Promise.all</code>) instead of sequential awaits to avoid waterfalls; see the TanStack Router guide for loader patterns.
In the route component, use the router's loader data (e.g. from route context or <code>useLoaderData</code>) instead of React Router's hook. Parent/child loader dependencies map to TanStack's parent route loaders. Child routes then read parent loader data from route context.
<h3>Step 4: Search Params and Validation</h3>
React Router exposes raw search params (e.g. <code>useSearchParams()</code>); you parse and validate in components. TanStack Router lets you define a search schema on the route with <code>validateSearch</code>. Centralize parsing and validation there so components get a typed object.
Example: a users list with <code>page</code> and <code>sort</code>:
<pre class="language-typescript"><code>const usersListRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/users',
 validateSearch: (search: Record&lt;string, unknown&gt;) =&gt; {
 const page = Number(search.page);
 const sort = String(search.sort || 'name');
 return {
 page: Number.isFinite(page) &amp;&amp; page &gt;= 1 ? page : 1,
 sort: ['name', 'created'].includes(sort) ? sort : 'name',
 };
 },
});
</code></pre>
Then in components, read and set search via the router's typed APIs so you never pass invalid values. Migrate one route at a time: add <code>validateSearch</code>, then switch the component to use the router's search API instead of <code>useSearchParams</code>.
<blockquote>
Pro Tip: <a href="https://reliasoftware.com/blog/zod-schema-validation-react-tutorial">Use Zod library</a> (or another schema lib) inside <code>validateSearch</code> for complex shapes and clear error handling. TanStack Router works with any function that returns the validated shape or throws.
</blockquote>
<h3>Step 5: Test and Go-Live</h3>
After mapping routes, loaders, and search params, test the migrated slice end-to-end. Click through every link and form that affects the URL or loader data. Check that:
<ul>
<li>URLs match the old app (same paths and query strings).</li>
<li>Loader data loads and displays correctly.</li>
<li>Search params are read and written with the validated shape.</li>
<li>Error and loading states still work (TanStack Router supports error boundaries and pending state).</li>
</ul>
Run your existing tests; update any that depend on React Router (e.g. wrapper or mock router). Then deploy behind a feature flag or migrate one section at a time so you can roll back if needed. Once the TanStack Router migration is stable, remove React Router and the old route tree.
<h2>Conclusion</h2>
A TanStack Router migration from React Router is manageable when you break it into steps: decide when it's worth it, audit routes and loaders, map route definitions to TanStack's API, migrate loaders and search params, then test and go-live.
You don't need a full rewrite; you can move one area of the app first and keep the rest on React Router until you're ready. Hope this guide will help you!
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!

Migrating from React Router to TanStack Router done by: 1: Auditing routes and loaders; 2: Mapping definitions; 3: Moving data loading: 4: Searching params.

A Full Guide to Migrate from React Router to TanStack Router

Migrate from React Router to TanStack Router

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This guide shows you how to migrate your React SPA to Astro with practical Astro React integration to reduce 60-80% bundle size and improve Core Web Vitals scores.

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Transform your simple React AI chatbot into a production-ready AI assistant with streaming responses, RAG, plugin integrations, accessibility, SEO, and more.

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Build a Node.js chatbot AI backend with Express to connect chatbot with OpenAI or Gemini, handle API requests securely, and deploy it to production.&nbsp;

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<a href="https://reliasoftware.com/blog/best-free-ai-chatbot" target="_blank" rel="noopener noreferrer">AI chatbots</a> are popping up everywhere, from customer support to internal tools and SaaS dashboards. But spinning one up from scratch? That&rsquo;s a time sink, especially if you just want to test an idea or ship <a href="https://reliasoftware.com/blog/mvp-in-software-development" target="_blank" rel="noopener noreferrer">a quick MVP</a>.
The good news: the React ecosystem has your back. With the rise of open-source tools and GPT-powered APIs, you can now deploy polished, functional chatbots in minutes, not weeks.
In this blog, we&rsquo;ll explore 5 plug-and-play React AI chatbot templates that are open-source, fast to deploy, and perfect for everything from personal side projects to startup prototypes. No need to worry about routing, <a href="https://reliasoftware.com/blog/react-state-management-libraries" target="_blank" rel="noopener noreferrer">state management</a>, or even the UI, these templates handle the heavy lifting so you can focus on customizing and shipping.
&gt;&gt; Read more: 
<ul>
<li>Top 9&nbsp;<a href="https://reliasoftware.com/blog/chatbot-development-frameworks" target="_blank" rel="noopener noreferrer">Best Chatbot Development Frameworks</a></li>
<li>How to <a href="https://reliasoftware.com/blog/react-mcp">Build an MCP Server and Integrate it with a React App</a>?</li>
</ul>
<h2>5 React AI Chatbot Templates</h2>
I've handpicked 5 open-source React chatbot templates that strike a great balance between clean design, powerful features, and fast setup. Each one works out of the box and can be tweaked to match your use case, whether you're building a support bot, internal tool, or AI assistant. Let&rsquo;s break them down.
<h3>Vercel Next.js AI Chatbot</h3>
Tech Stack: Next.js App Router, <a href="https://reliasoftware.com/blog/tailwind-css-react" target="_blank" rel="noopener noreferrer">Tailwind CSS</a>, OpenAI
What Makes It Stand Out: Built by the Vercel team, this template is a reference-grade example of modern React + GPT integration. It uses <a href="https://reliasoftware.com/blog/react-server-actions" target="_blank" rel="noopener noreferrer">Server Actions</a> and <a href="https://reliasoftware.com/blog/react-server-components" target="_blank" rel="noopener noreferrer">React Server Components</a> for seamless streaming and is optimized for instant Vercel deployment.
Ideal For: Developers exploring Next.js 13+ features or looking to prototype a full-stack AI app fast.
Why You&rsquo;ll Like It: Minimal setup, no need for client-side fetching, and native support for OpenAI&rsquo;s streaming responses.
GitHub: <a href="https://github.com/vercel-labs/ai-chatbot">vercel/nextjs-ai-chatbot</a>
<figure class="image image_resized align-center" style="width: 90%;"><img src="https://api.reliasoftware.com/uploads/vercel_next_js_ai_chatbot_563f5b02bb.webp" alt="Vercel Next.js AI Chatbot" width="700" height="420">
<figcaption>Vercel Next.js AI Chatbot</figcaption>
</figure>
<h3>Horizon UI &ndash; ChatGPT AI Template</h3>
Tech Stack: React, Chakra UI, OpenAI API
What Makes It Stand Out: This template brings a polished, professional dashboard-style interface with modular Chakra UI components. It&rsquo;s clean, mobile-responsive, and built for teams that care about UX out of the gate.
Ideal For: Internal tools, admin dashboards, or any app where a chatbot is one part of a broader interface.
Why You&rsquo;ll Like It: Dead-simple structure, great out-of-the-box styles, and easy to scale into more complex layouts.
GitHub: <a href="https://github.com/horizon-ui/chatgpt-ai-template">horizon-ui/chatgpt-ai-template</a>
<figure class="image image_resized align-center" style="width: 90.08%;"><img src="https://api.reliasoftware.com/uploads/horizon_ui_chatgpt_ai_template_35412c1ecb.webp" alt="Horizon UI &ndash; ChatGPT AI Template" width="700" height="420">
<figcaption>Horizon UI &ndash; ChatGPT AI Template</figcaption>
</figure>
<h3>Fireship React Firebase Chat</h3>
Tech Stack: React + Firebase Auth + Firestore
What Makes It Stand Out: Built by Fireship, this template offers a clean, production-ready setup for Firebase-powered real-time chat. It includes Google authentication and live Firestore updates out of the box.
Ideal For: MVPs, internal tools, or any <a href="https://reliasoftware.com/blog/react-project-ideas" target="_blank" rel="noopener noreferrer">React projects</a> that uses Firebase for authentication and real-time data sync.
Why You&rsquo;ll Like It: No backend setup required, you get instant login, user management, and chat persistence. It&rsquo;s minimal, well-documented, and easy to extend with GPT functionality.
GitHub: <a href="https://github.com/fireship-io/react-firebase-chat">fireship-io/react-firebase-chat</a>
<figure class="image image_resized align-center" style="width: 91.74%;"><img src="https://api.reliasoftware.com/uploads/fireship_react_firebase_chat_2855af7f80.webp" alt="Fireship React Firebase Chat" width="700" height="420">
<figcaption>Fireship React Firebase Chat</figcaption>
</figure>
<h3>React ChatGPT Clone</h3>
Tech Stack: React, Vite, OpenAI API
What Makes It Stand Out: Lightweight and easy to understand, this template strips things down to the essentials. No fancy styling or complex state logic, just a simple GPT-powered chat UI.
Ideal For: Developers learning how to work with GPT APIs or <a href="https://reliasoftware.com/blog/proof-of-concept-poc" target="_blank" rel="noopener noreferrer">building a quick proof-of-concept</a>.
Why You&rsquo;ll Like It: Super clean architecture. Perfect for experimentation, hacking together new ideas, or building teaching demos.
GitHub: <a href="https://github.com/uigywnkiub/react-chatgpt-clone">uigywnkiub/react-chatgpt-clone</a>
<figure class="image image_resized align-center" style="width: 90.35%;"><img src="https://api.reliasoftware.com/uploads/react_chatgpt_clone_03003a8e99.webp" alt="React ChatGPT Clone" width="700" height="420">
<figcaption>React ChatGPT Clone</figcaption>
</figure>
<h3>Chatbot UI &ndash; Custom GPT Assistant Interface</h3>
Tech Stack: React, Tailwind CSS, (optional) LangChain.js
What Makes It Stand Out: Inspired by ChatGPT itself, this template goes beyond basic Q&amp;A. It supports assistant personas, function calling, and streaming, all in a clean, extensible interface.
Ideal For: Building full-fledged <a href="https://reliasoftware.com/blog/what-is-agentic-ai" target="_blank" rel="noopener noreferrer">AI agents</a>, developer tools, or assistants with specialized knowledge and custom logic.
Why You&rsquo;ll Like It: Highly customizable, feature-rich, and battle-tested by the open-source community. It&rsquo;s arguably the most scalable foundation on this list.
GitHub: <a href="https://github.com/mckaywrigley/chatbot-ui">mckaywrigley/chatbot-ui</a>
<figure class="image image_resized" style="width: 90.28%;"><img src="https://api.reliasoftware.com/uploads/chatbot_ui_custom_gpt_assistant_interface_2a9a6eb56b.webp" alt="Chatbot UI &ndash; Custom GPT Assistant Interface" width="700" height="420">
<figcaption>Chatbot UI &ndash; Custom GPT Assistant Interface</figcaption>
</figure>
&gt;&gt; Read more:
<ul>
<li>Top 6 <a href="https://reliasoftware.com/blog/ai-agent-frameworks" target="_blank" rel="noopener noreferrer">Open-source AI Agent Frameworks</a></li>
<li>What Are <a href="https://reliasoftware.com/blog/ai-agent-vs-chatbot" target="_blank" rel="noopener noreferrer">Differences Between AI Agent and Chatbot</a>?</li>
</ul>
<h2>React AI Chatbot Use Case Matching</h2>
Not all templates serve the same goal. Here&rsquo;s a quick breakdown to help you choose the right one based on your project type, need for authentication, and flexibility in extending features:
<figure class="table">
<table style="border-color: hsl(0, 0%, 0%); border-style: solid;">
<tbody>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Template</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Best For</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Auth Support</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Extensibility</td>
</tr>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Vercel AI Chatbot</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">General-purpose apps, demos, server components</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">❌</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">⭐⭐⭐⭐</td>
</tr>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Horizon UI ChatGPT</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Dashboards, internal tools, polished UIs</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">❌</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">⭐⭐⭐⭐</td>
</tr>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Fireship</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Firebase-backed apps, user-based experiences</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">✅</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">⭐⭐⭐</td>
</tr>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">React ChatGPT Clone</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Learning projects, lightweight MVPs</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">❌</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">⭐⭐</td>
</tr>
<tr>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Chatbot UI</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Custom AI agents, function calling, GPT tooling</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">Optional</td>
<td style="border-color: hsl(0, 0%, 0%); border-style: solid; text-align: center;">⭐⭐⭐⭐⭐</td>
</tr>
</tbody>
</table>
</figure>
What This Table Tells You?
<ul>
<li>Auth Support: Whether the template includes or supports user authentication out of the box.</li>
<li>Extensibility: How easily you can scale or customize the template&rsquo;s architecture for more advanced use cases.</li>
<li>Best For: The primary context in which the template shines. This can save you from over-building or under-delivering.</li>
</ul>
If you&rsquo;re just exploring GPT or working on a side project, make it simple. If you&rsquo;re aiming for something production-ready or tailored to a specific workflow (like internal tools or assistant interfaces), lean toward extensibility and auth-ready setups.
<h2>Integration Guide</h2>
Most of these templates are ready to run in under 10 minutes. Here's a typical setup flow you can follow across the board, whether you're deploying to Vercel or running locally for testing.
1. Clone the Repository
Start by grabbing the codebase from GitHub:
<pre class="language-typescript"><code>git clone https://github.com/your-chosen-template
cd your-chosen-template
</code></pre>
Make sure to review the <code>README.md</code>&mdash;most templates include project-specific notes or environment setup tips.
2. Install Dependencies
Install required packages:
<pre class="language-typescript"><code>npm install
# or use
pnpm install
</code></pre>
Templates <a href="https://reliasoftware.com/blog/how-to-create-react-app-using-vite" target="_blank" rel="noopener noreferrer">built with Vite</a> or Next.js may also require some peer dependencies, so keep an eye on the terminal output.
3. Get Your OpenAI API Key
To connect your chatbot to GPT:
<ol>
<li>Go to <a href="https://platform.openai.com/account/api-keys">https://platform.openai.com/account/api-keys</a></li>
<li>Sign in or create an OpenAI account</li>
<li>Click Create new secret key</li>
<li>Copy it and store it securely&mdash;you won&rsquo;t see it again</li>
</ol>
Paste it into a <code>.env.local</code> file like this: &nbsp;&nbsp;
<pre class="language-typescript"><code># .env.local
OPENAI_API_KEY=sk-xxxx...
</code></pre>
Some templates (like Fireship) may need Firebase credentials as well. Follow the docs for those. If you're using a hosted environment (like Vercel), add it via the dashboard under Project Settings &rarr; Environment Variables.
4. Run the App Locally
Kickstart your development server:
<pre class="language-typescript"><code>npm run dev</code></pre>
You should see the chatbot UI up and running. From here, test prompts, refine the UX, and make it your own.
5. Customize the Experience
The best part of using these templates is that they&rsquo;re not opinionated. You can:
<ul>
<li>Tweak styles and themes (Tailwind, Chakra, or plain CSS)</li>
<li>Swap out the GPT prompt logic</li>
<li>Add authentication layers (e.g., Firebase, Auth0)</li>
<li>Hook into your own data APIs or databases</li>
</ul>
These templates are built to be extended. Feel free to think outside the box.
&gt;&gt; Explore further:
<ul>
<li>Top 10 Best <a href="https://reliasoftware.com/blog/ai-development-tools" target="_blank" rel="noopener noreferrer">AI Development Tools</a> for Software Developers</li>
<li>Top 19 <a href="https://reliasoftware.com/blog/ai-app-ideas" target="_blank" rel="noopener noreferrer">AI App Ideas For Businesses by Industry</a></li>
</ul>
<h2>Conclusion</h2>
You don&rsquo;t need to start from scratch or spend weeks configuring boilerplate to build a smart, user-friendly chatbot. React empowers developers to harness powerful AI tools like GPT with ease. With these templates, you can skip the setup hassle and go straight to building value.
<ul>
<li>They&rsquo;re all free and open-source</li>
<li>Ready for instant deployment</li>
<li>Simple to customize and extend</li>
</ul>
Pick the template that aligns with your stack and goals&mdash;and let the innovation begin.
Start building now, and focus on what truly matters: solving problems with great user experiences.
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!

Vercel AI Chatbot, Horizon UI ChatGPT, Fireship React Firebase Chat, React ChatGPT Clone, and Chatbot UI are 5 React AI chatbot templates you can deploy in minutes.

Top 5 React AI Chatbot Templates You Can Deploy in Minutes

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Top 5 React AI Chatbot Templates You Should Know

Digital clock, simple image slider, age calculator, recipe book app, e-commerce product page, etc, are popular Javascript project ideas for developers.

Top 10+ Best JavaScript Project Ideas For Developers

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10+ JavaScript Project Ideas for Beginners to Advanced Coders

In this tutorial, we'll learn the process of building a real-time React chat app using React for the front-end and Socket.io for handling WebSocket communication.

How to Build Real-Time React Chat App with Socket.io? | Relia Software

How to Build Real-Time React Chat App with Socket.io?

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This guide implements a complete product recommendation system for a React machine learning app using TensorFlow and mentions performance optimization strategies.

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How to Implement Machine Learning in Your React App?

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Implement Machine Learning in Your React App for Better UX

Modern web development needs speed, scalability, and security. JAMstack meets these needs by decoupling the content layer from the presentation layer, so that pre-rendered pages to be served via CDNs while dynamic content is fetched through APIs.
With the&nbsp;<a href="https://reliasoftware.com/blog/nextjs-15-new-features">recent updates to Next.js</a>, which now runs seamlessly with <a href="https://reliasoftware.com/blog/new-features-and-improvements-in-react-19">React 19</a>, we can build lightweight yet powerful web applications that load fast and are easy to maintain. In this guide, I'll take advantage of these benefits to build a JAMstack site with Next.js.
&gt;&gt; Explore more: <a href="https://reliasoftware.com/blog/next-js-typescript">Using Next.js with TypeScript</a> to Upgrade Your React Development
<h2>Starting Your Project from Scratch</h2>
Begin by creating a fresh Next.js project that supports both file‑based routing and modern rendering strategies such as Static Site Generation (SSG) and Incremental Static Regeneration (ISR).
Run the following commands:
<pre class="language-typescript"><code># Create a new project using the latest create-next-app
npx create-next-app my-jamstack-site
cd my-jamstack-site
# Optionally, if you want to experience the blazing-fast development mode:
npm run dev -- --turbo
</code></pre>
This will launch a local development server. You can verify the setup by visiting http://localhost:3000, where you should see your default landing page.
<h2>Organizing Routes and Pages</h2>
Next.js uses a file‑based routing system. You can choose between the traditional <code>/pages</code> directory or adopt the new <code>/app</code> folder for enhanced features like nested layouts. Here&rsquo;s a unique example using the <code>/pages</code> directory for a homepage:
<pre class="language-typescript"><code>// pages/index.tsx
import Link from 'next/link';
export default function HomePage() {
 return (
 &lt;main style={{ padding: "2rem", fontFamily: "sans-serif" }}&gt;
 &lt;h1&gt;Welcome to the JAMstack Revolution&lt;/h1&gt;
 &lt;p&gt;This page is pre-rendered at build time for maximum speed.&lt;/p&gt;
 &lt;Link href="/about"&gt;
 &lt;a&gt;Learn more about JAMstack&lt;/a&gt;
 &lt;/Link&gt;
 &lt;/main&gt;
 );
}
</code></pre>
For dynamic routes, you can generate pages using SSG with revalidation. For example, create a product detail page:
<pre class="language-typescript"><code>// pages/products/[id].tsx
export default async function ProductPage({ params }: { params: { id: string } }) {
 const response = await fetch(`https://api.example.com/products/${params.id}`, { cache: 'force-cache' });
 const product = await response.json();
 return (
 &lt;article style={{ padding: "2rem" }}&gt;
 &lt;h1&gt;{product.name}&lt;/h1&gt;
 &lt;p&gt;{product.description}&lt;/p&gt;
 &lt;/article&gt;
 );
}
export async function getStaticPaths() {
 const res = await fetch('https://api.example.com/products');
 const products = await res.json();
 const paths = products.map((p: any) =&gt; ({ params: { id: p.id.toString() } }));
 return { paths, fallback: 'blocking' };
}
export async function getStaticProps({ params }: { params: { id: string } }) {
 const response = await fetch(`https://api.example.com/products/${params.id}`, { cache: 'force-cache' });
 const product = await response.json();
 return {
 props: { product },
 revalidate: 60,
 };
}
</code></pre>
<h2>Integrating with a Headless CMS</h2>
To keep content management separate from code, many projects integrate <a href="https://reliasoftware.com/blog/custom-cms-development">a headless CMS</a>. In this example, we&rsquo;ll use Sanity to demonstrate a fresh approach to headless integration.
<h3>Setting Up Sanity</h3>
<ul>
<li>Install the Sanity CLI (if you haven&rsquo;t already):</li>
</ul>
<pre class="language-typescript"><code>npm install -g @sanity/cli
</code></pre>
<ul>
<li>Create a new Sanity project:</li>
</ul>
<pre class="language-typescript"><code>sanity init --coupon nextjs2025
</code></pre>
<ul>
<li>Configure your project and set up your content schema via the Sanity Studio.</li>
</ul>
<h3>Connecting Sanity to Your Next.js App</h3>
In your Next.js project, install the Sanity client:
<pre class="language-typescript"><code>npm install @sanity/client @portabletext/react
</code></pre>
Then, create a helper file for your Sanity configuration:
<pre class="language-typescript"><code>// lib/sanityClient.ts
import sanityClient from '@sanity/client';
export const client = sanityClient({
 projectId: process.env.NEXT_PUBLIC_SANITY_PROJECT_ID || 'yourProjectId',
 dataset: process.env.NEXT_PUBLIC_SANITY_DATASET || 'production',
 apiVersion: '2025-02-24', // use current date for latest API version
 useCdn: true,
});
</code></pre>
Use this client in your pages to fetch and render data. For instance, a blog listing page might look like this:
<pre class="language-typescript"><code>// pages/blog.tsx
import { client } from '../lib/sanityClient';
export default function Blog({ posts }: { posts: any[] }) {
 return (
 &lt;section style={{ padding: "2rem" }}&gt;
 &lt;h1&gt;Our Blog&lt;/h1&gt;
 &lt;ul&gt;
 {posts.map((post) =&gt; (
 &lt;li key={post._id}&gt;
 &lt;a href={`/blog/${post.slug.current}`}&gt;{post.title}&lt;/a&gt;
 &lt;/li&gt;
 ))}
 &lt;/ul&gt;
 &lt;/section&gt;
 );
}
export async function getStaticProps() {
 const posts = await client.fetch(`*[_type == "post"]{ _id, title, slug }`);
 return {
 props: { posts },
 revalidate: 60,
 };
}
</code></pre>
<h2>Build Optimization &amp; Dynamic Content Handling</h2>
Modern sites need to balance static content with dynamic interactivity. With the latest improvements, non-interactive components can be rendered on the server, reducing the client-side bundle size. Consider this example of a non-interactive pricing table:
<pre class="language-typescript"><code>// pages/pricing.tsx
export default async function Pricing() {
 const response = await fetch('https://api.example.com/pricing', { cache: 'force-cache' });
 const pricing = await response.json();
 return (
 &lt;div style={{ padding: "2rem" }}&gt;
 &lt;h1&gt;Pricing&lt;/h1&gt;
 &lt;table&gt;
 &lt;thead&gt;
 &lt;tr&gt;
 &lt;th&gt;Plan&lt;/th&gt;
 &lt;th&gt;Price&lt;/th&gt;
 &lt;/tr&gt;
 &lt;/thead&gt;
 &lt;tbody&gt;
 {pricing.map((plan: any) =&gt; (
 &lt;tr key={plan.id}&gt;
 &lt;td&gt;{plan.name}&lt;/td&gt;
 &lt;td&gt;{plan.price}&lt;/td&gt;
 &lt;/tr&gt;
 ))}
 &lt;/tbody&gt;
 &lt;/table&gt;
 &lt;/div&gt;
 );
}
</code></pre>
By pre-rendering static elements and using client components only where necessary, you ensure that pages load quickly and efficiently.
<h2><a href="https://reliasoftware.com/blog/deployment-strategy">Deployment Strategies</a></h2>
<h3>Hosting Options</h3>
For production deployments, platforms such as Vercel and Netlify are the go-to choices. They offer native support for incremental static regeneration and edge caching, ensuring your site remains fast worldwide.
Vercel Example
<ul>
<li>Push your code to GitHub.</li>
<li>Import your repository in Vercel.</li>
<li>Deploy with automatic configurations: Vercel detects your Next.js setup and applies optimized build and cache settings.</li>
</ul>
<h3>Performance Tuning</h3>
<ul>
<li>Image Optimization: Use the built-in image component to automatically resize and serve images in modern formats.</li>
<li>Caching &amp; Revalidation: Leverage explicit caching options in your fetch calls and set up ISR to balance fresh content with performance.</li>
<li>Monitoring: Integrate observability tools (like Vercel Analytics or Lighthouse) to keep track of <a href="https://reliasoftware.com/blog/product-metrics-in-software-engineering">performance metrics</a> and user experience.</li>
</ul>
<h2>Conclusion</h2>
In this guide, we explored the power of JAMstack using the latest <a href="https://reliasoftware.com/blog/what-is-next-js">Next.js framework</a>. By setting up a modern project, integrating a headless CMS like Sanity, optimizing for both static and dynamic content, and deploying on leading platforms, you can build fast, scalable, and secure web applications.
By following these guidelines and leveraging the latest improvements, you&rsquo;ll be well on your way to creating a state-of-the-art JAMstack site that delights users and simplifies your development process.

Additional Resources &amp; Checklist
<ul>
<li><a href="https://nextjs.org/docs" rel="nofollow noreferrer">Official Next.js Documentation</a></li>
<li><a href="https://www.sanity.io/guides" rel="nofollow noreferrer">Sanity Integration Guide</a></li>
<li><a href="https://vercel.com/docs" rel="nofollow noreferrer">Vercel Deployment Guide</a></li>
<li><a href="https://nextjs.org/docs/app/building-your-application/upgrading" rel="nofollow noreferrer">Upgrade Checklist for Next.js</a></li>
</ul>
<div id="article_content" class="inner_article__entries__X3PKd">
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!
</div>

Steps to build Next.js JAMstack sites: 1: Setup a new project; 2: Organize pages &amp; implement SSG/ISR; 3: Integrate a headless CMS; 4: Optimize performance; 5: Deploy.

The Ultimate Guide to Building JAMstack Sites with Next.js | Relia Software

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How to Build JAMstack Sites with Next.js? Code Sample Included

Server Actions, React Server Components, Dynamic HTML Streaming, Partial Prerendering (Experimental), next/after API (Experimental) are key Next.js 15 features.

What's New in Next.js 15? Next.js 15 Upgrade Guide | Relia Software

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What are New Features in Next.js 15? Next.js 15 Upgrade Guide

Web development has grown rapidly, with <a href="https://reliasoftware.com/blog/building-front-end-applications-with-react">React being a top front-end framework</a> thanks to its component-based design, virtual DOM, and declarative UI. As applications grow more complex, developers need frameworks that prioritize&nbsp;scalability, performance, and productivity.And, <a href="https://reliasoftware.com/blog/what-is-next-js">Next.js is the go-to framework</a> for solving these needs. It seamlessly integrates static site generation (SSG), <a href="https://reliasoftware.com/blog/react-server-side-rendering-best-practices">server-side rendering (SSR)</a>, and incremental static regeneration (ISR). Especially, when combined with TypeScript, Next.js offers:<ul><li><a href="https://reliasoftware.com/blog/build-a-type-safe-backend-with-nestjs-prisma-pothos-graphql">Type safety</a> for error-free code.</li><li>Scalability for enterprise-level applications.</li><li>Improved productivity with IDE integrations and advanced code navigation.</li><li>Better maintainability for large, collaborative teams.</li></ul>In this guide, we will explore:<ul><li>Why Next.js and TypeScript are the perfect pair.</li><li>Setting up TypeScript in a Next.js project for optimal development.</li><li>Leveraging Next.js’s key features in TypeScript to build scalable and secure applications.</li><li>Best practices for testing, debugging, and performance monitoring.</li></ul>Let’s dive into the details.&gt;&gt;&nbsp;You may be interested in:<ul><li><a href="https://reliasoftware.com/blog/nextjs-15-new-features">What are New Features in Next.js 15</a>? Next.js 15 Upgrade Guide</li><li>Optimize <a href="https://reliasoftware.com/blog/nextjs-ecommerce-optimization-for-better-seo-and-performance">Next.js E-commerce Sites for Better SEO and Performance</a></li></ul><h2>Why Next.js with TypeScript?</h2><h3>The Rise of TypeScript</h3>TypeScript has become the de facto standard for large-scale JavaScript applications. Its statically typed language helps developers catch errors before runtime, making codebases more reliable and easier to maintain.Key benefits include:<ul><li>Type Inference: Reduces boilerplate code while maintaining type safety.</li><li>IDE Support: IntelliSense, auto-completion, and real-time error detection speed up development.</li><li>Compile-Time Error Checking: Prevents runtime failures by validating data structures early.</li><li>Refactoring Confidence: Enables large-scale code changes without fear of breaking functionality.</li></ul><h3>Next.js Enhances TypeScript Benefits</h3>Next.js builds upon React’s strengths and introduces powerful features designed for performance and scalability, including:<ul><li>Experimental <a href="https://reliasoftware.com/blog/react-compiler">React Compiler</a>: Automatically optimizes components so you no longer need to manually manage performance tweaks like memoization.</li><li>Modern Build Tools: Advanced bundlers (such as Turbopack) drastically reduce build times and improve refresh speeds.</li><li>Enhanced Caching Strategies: Innovative, tag-based revalidation simplifies dynamic and static content handling.</li><li><a href="https://reliasoftware.com/blog/react-server-components">Server Components</a> and Secure Actions: Offload rendering to the server and secure critical operations with automatically generated, unguessable endpoints.</li><li>Native TypeScript Support: From configuration files to application code, Next.js integrates seamlessly with TypeScript, ensuring robust type checking and improved developer confidence.</li></ul>Together, Next.js and TypeScript create an environment that is error-resistant, developer-friendly, and future-proof.<h2>How to Set Up TypeScript in Next.js?</h2><h3>Project Initialization</h3>To set up a Next.js project with TypeScript, run:<pre><code class="language-typescript">npx create-next-app my-next-app --typescript
cd my-next-app
</code></pre>This command generates a TypeScript-ready project with essential configurations in place.<h3>Validating Configuration</h3>Examine the <code>tsconfig.json</code> file:<pre><code class="language-typescript">{
 "compilerOptions": {
 "target": "es5",
 "module": "esnext",
 "strict": true,
 "jsx": "preserve",
 "esModuleInterop": true,
 "resolveJsonModule": true,
 "noImplicitAny": true,
 "strictNullChecks": true
 },
 "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
 "exclude": ["node_modules"]
}
</code></pre>This configuration enforces strict type checking and ensures compatibility with modern JavaScript standards.<h2>How TypeScript Strengthens Next.js’s Performance and Security Features?</h2><h3>React Compiler: Type-Safe Performance Optimizations</h3>Next.js now includes experimental compiler features that automatically optimize components, reducing the need for manual performance tweaks. Previously, developers might have wrapped expensive components in <a href="https://reliasoftware.com/blog/react-usememo-vs-usecallback-hooks"><code>useMemo</code> or <code>useCallback</code> hooks</a> to prevent unnecessary re-renders.With the React Compiler, you can write straightforward code while optimizations are applied behind the scenes.&nbsp;TypeScript helps these optimizations are type-safe, reducing unexpected runtime errors.Here's a practical example:<pre><code class="language-typescript">// Without automatic optimizations
function ExpensiveComponent({ data }: Props) {
 return useMemo(() =&gt; (
 &lt;div className="expensive-component"&gt;
 {/* Complex rendering logic */}
 &lt;/div&gt;
 ), [data]);
}

// With the React Compiler optimizations
function ExpensiveComponent({ data }: Props) {
 return (
 &lt;div className="expensive-component"&gt;
 {/* Complex rendering logic */}
 &lt;/div&gt;
 );
}
</code></pre>This advancement lets you focus on clean, maintainable code while Next.js handles performance improvements automatically.<h3>Enhanced Security for Server Actions</h3>Next.js revolutionizes server-side security with its enhanced <a href="https://reliasoftware.com/blog/react-server-actions">server actions</a> system. The framework now automatically generates unique, unguessable endpoints for each server action, protecting your APIs from unauthorized access. This security layer integrates seamlessly with TypeScript, ensuring that data handling remains type-safe from client to server.For example:<pre><code class="language-typescript">// app/actions.ts
'use server'

interface UpdateUserData {
 userId: string;
 name: string;
 email: string;
}

export async function updateUser({ userId, name, email }: UpdateUserData) {
 // Next.js automatically secures this endpoint
 try {
 const result = await db.user.update({
 where: { id: userId },
 data: { name, email }
 });
 return { success: true, data: result };
 } catch (error) {
 // Error handling with type safety
 return { success: false, error: 'Failed to update user' };
 }
}
</code></pre>By combining secure server actions with TypeScript’s type system, you build a robust security barrier that protects your application at multiple levels.<h3>Turbopack: Faster Builds and Refreshes</h3>Next.js leverages modern build tools like Turbopack, which dramatically reduce build times by using intelligent caching and incremental compilation strategies. When you change your code, Turbopack rebuilds only the affected modules, leading to near-instantaneous updates during development.For example, consider this simple configuration:<pre><code class="language-typescript">// next.config.ts
import { type NextConfig } from 'next'

const config: NextConfig = {
 experimental: {
 turbo: {
 rules: {
 // Custom rules for Turbopack
 '*.css': ['style-loader', 'css-loader']
 }
 }
 }
}

export default config
</code></pre>This streamlined configuration helps you spend less time waiting for builds and more time iterating on your code, leading to faster <a href="https://reliasoftware.com/blog/software-development-life-cycle-sdlc">development cycles</a> and improved productivity.&nbsp;<h3>Smarter Caching Strategies</h3>Next.js introduces innovative caching strategies through tag-based revalidation. Instead of relying solely on time-based cache invalidation, you can now use smart labels to control precisely when content needs refreshing. This flexible approach enables efficient updates, ensuring that only the affected parts of your application are refreshed.For instance, consider this caching pattern:<pre><code class="language-typescript">// utils/fetch-wrapper.ts
interface CacheConfig {
 revalidate?: number;
 tags?: string[];
}

// Enhanced fetch wrapper demonstrating modern caching patterns
async function fetchWithCache&lt;T&gt;(
 url: string,
 config: CacheConfig = {}
): Promise&lt;T&gt; {
 const response = await fetch(url, {
 next: {
 // Combine time-based and tag-based strategies
 revalidate: config.revalidate,
 tags: config.tags
 }
 });

 if (!response.ok) {
 throw new Error(`HTTP error! status: ${response.status}`);
 }

 return response.json();
}
</code></pre>And applied in a real-world scenario:<pre><code class="language-typescript">// Practical application in an e-commerce context
async function ProductPage({ id }: { id: string }) {
 // Fetch product data with intelligent caching
 const product = await fetchWithCache&lt;Product&gt;(
 `/api/products/${id}`,
 {
 // Refresh cache every minute as a baseline
 revalidate: 60,
 // Enable precise updates when this product changes
 tags: [`product-${id}`]
 }
 );

 return &lt;ProductDisplay product={product} /&gt;;
}
</code></pre>This strategy ensures that when a product's information changes, only the relevant cached data is revalidated, maintaining optimal performance. You can see, TypeScript enforces data consistency, ensuring cache strategies work reliably.&nbsp;<h3>Testing and Quality Assurance</h3>Testing in Next.js with TypeScript is intuitive and covers both client and server-side functionality. The framework’s robust testing capabilities enable you to verify complex behaviors, from server component rendering to advanced data fetching patterns.For example, a comprehensive test suite might look like this:<pre><code class="language-typescript">// __tests__/components/ServerComponent.test.tsx
import { render, screen } from '@testing-library/react'
import { ServerComponent } from '@/components/ServerComponent'

describe('ServerComponent', () =&gt; {
 it('handles server-side data fetching correctly', async () =&gt; {
 const mockData = {
 title: 'Professional Camera X100',
 price: 999.99,
 inStock: true
 };

 global.fetch = jest.fn(() =&gt;
 Promise.resolve({
 ok: true,
 json: () =&gt; Promise.resolve(mockData)
 })
 ) as jest.Mock;

 render(await ServerComponent());

 expect(screen.getByText(mockData.title)).toBeInTheDocument();
 expect(screen.getByText(`$${mockData.price}`)).toBeInTheDocument();
 expect(screen.getByText('In Stock')).toBeInTheDocument();
 });

 it('gracefully handles error states', async () =&gt; {
 global.fetch = jest.fn(() =&gt;
 Promise.reject(new Error('Network error'))
 ) as jest.Mock;

 render(await ServerComponent());

 expect(screen.getByText('Unable to load product')).toBeInTheDocument();
 });
});
</code></pre><h3>Performance Monitoring</h3>Next.js provides enhanced instrumentation capabilities that give you deep insights into your application’s behavior. By setting up performance monitoring, you can capture actionable metrics to guide your optimization efforts.For example:<pre><code class="language-typescript">// instrumentation.ts
export async function register() {
 if (process.env.NEXT_RUNTIME === 'nodejs') {
 const { registerMetric } = await import('@vercel/analytics');

 // Track critical user experience metrics
 registerMetric('Time To First Byte', async () =&gt; {
 const timing = performance.getEntriesByType('navigation')[0];
 return timing.responseStart - timing.requestStart;
 });

 // Monitor server-side rendering performance
 registerMetric('Server Render Time', async () =&gt; {
 const timing = performance.getEntriesByType('server')[0];
 return timing.duration;
 });

 // Track client-side hydration
 registerMetric('Hydration Time', async () =&gt; {
 const hydration = performance.getEntriesByType('hydration')[0];
 return hydration ? hydration.duration : 0;
 });
 }
}
</code></pre>&nbsp;This setup provides a sophisticated dashboard of performance metrics, helping you identify and address bottlenecks quickly.&gt;&gt;&nbsp;Read more:&nbsp;<ul><li>Enhanced <a href="https://reliasoftware.com/blog/performance-optimization-in-react">Techniques for Performance Optimization in React</a> 19</li><li style="margin-left:0px;"><a href="https://reliasoftware.com/blog/astro-vs-next-js" target="_blank" rel="noopener noreferrer">Astro vs Next.js</a>: Which one is better?</li></ul><h2>Conclusion</h2>Next.js and TypeScript redefine modern web development by addressing the challenges of performance, scalability, and code quality.The experimental React Compiler eliminates manual performance optimizations, letting developers focus on building features rather than debugging re-renders. Meanwhile, secure server actions and TypeScript’s robust type safety ensure reliable data handling and protection against vulnerabilities.Modern build tools, intelligent caching, and enhanced monitoring further streamline the development workflow—enabling rapid iteration and efficient content updates as applications grow.Together, Next.js and TypeScript set a new standard for building robust, scalable, and future-proof applications. Whether you’re launching a small project or scaling an enterprise system, this stack provides the tools and confidence to deliver exceptional user experiences.The future of React development is here—faster, safer, and more powerful than ever.&gt;&gt;&gt; Follow and Contact <a href="https://reliasoftware.com/">Relia Software</a> for more information!

Using Next.js with TypeScript helps error-free code with type safety, scalability&nbsp;for enterprise apps,&nbsp;productivity with IDE support, easier&nbsp;maintenance for large teams.

Using Next.js with TypeScript to Upgrade Your React Development | Relia Software

Using Next.js with TypeScript to Upgrade Your React Development

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In today&rsquo;s digital world, web applications need to be highly performant, scalable, and cost-effective. Traditional server-based architectures struggle to match these requirements, causing development teams infrastructure management and scaling issues.
Serverless architecture is revolutionizing the way we build and deploy web applications. This technique has unique benefits for React developers since it combines the flexibility of React's component-based architecture with the power of cloud computing.
<h2>Understanding Serverless Architecture</h2>
Serverless computing changes how we approach application deployment and scaling. Developers write code that runs in response to events rather than directly controlling servers, with the cloud provider handling any infrastructure concerns.
Key Benefits: 
The serverless approach provides several compelling advantages: 
<ul>
<li>Development Focus: Because infrastructure management is handled automatically, developers can focus solely on writing application logic. </li>
<li>Automatic Scaling: Applications can handle a single request or millions of concurrent users, scaling instantly based on actual demand. </li>
<li>Cost Optimization: By removing costs for unused resources, you just pay for the real compute time&mdash;measured in milliseconds. </li>
<li>Global Deployment: Edge functions enable code execution closer to users, reducing latency and improving performance.</li>
</ul>
<h2>The React and Serverless Synergy</h2>
Serverless principles are naturally matched with React's component-based architecture. This collaboration shows up in several ways: 
<ul>
<li>Data Flow: React&rsquo;s unidirectional data flow integrates well with serverless APIs to keep presentation and business logic clearly separated. </li>
<li>State Management: <a href="https://reliasoftware.com/blog/react-state-management-libraries">React's state management libraries</a> complement serverless functions, enabling efficient data handling and updates. </li>
<li>Rendering Strategies: Serverless platforms support both Static Site Generation (SSG) and&nbsp;<a href="https://reliasoftware.com/blog/react-server-side-rendering-best-practices">Server-Side Rendering</a> (SSR), allowing flexible rendering approaches based on your needs.</li>
</ul>
<h2>Modern Serverless Stack: AWS Lambda and Vercel</h2>
<h3>AWS Lambda</h3>
AWS Lambda excels at handling complex backend operations, providing:
<ul>
<li>Scalable compute resources for API endpoints</li>
<li>Integration with AWS services like DynamoDB and S3</li>
<li>Custom runtime environments for specific workloads</li>
<li>Detailed monitoring and logging capabilities</li>
</ul>
<h3>Vercel</h3>
Vercel specializes in frontend deployment and edge computing:
<ul>
<li>Optimized React application hosting</li>
<li>Built-in <a href="https://reliasoftware.com/blog/5-best-practices-for-enhancing-ci-cd-pipeline-security">CI/CD pipelines</a></li>
<li>Edge Functions for improved performance</li>
<li>Automatic SSL and CDN configuration</li>
</ul>
<h2>Implementation Guide to Create Serverless React Apps</h2>
<h3>Setting Up the Development Environment</h3>
First, ensure you have the necessary tools installed:
<pre class="language-javascript"><code># Install development dependencies
npm install -g vercel aws-cli typescript

# Create a new TypeScript-based React application
npx create-react-app my-serverless-app --template typescript
cd my-serverless-app

# Install additional dependencies
npm install @tanstack/react-query @aws-sdk/client-dynamodb @aws-sdk/lib-dynamodb
</code></pre>
<h3>Creating a Modern Lambda Function</h3>
Modern Lambda functions should use TypeScript and the AWS SDK v3 for improved type safety and better development experience. Here's an example of a well-structured Lambda function:
<pre class="language-javascript"><code>import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import { DynamoDBDocumentClient, QueryCommand } from "@aws-sdk/lib-dynamodb";
import { APIGatewayProxyEvent, APIGatewayProxyResult } from 'aws-lambda';

const client = new DynamoDBClient({});
const docClient = DynamoDBDocumentClient.from(client);

export const handler = async (
 event: APIGatewayProxyEvent
): Promise&lt;APIGatewayProxyResult&gt; =&gt; {
 try {
 // Validate request method
 if (event.httpMethod !== 'GET') {
 return {
 statusCode: 405,
 body: JSON.stringify({ error: 'Method not allowed' })
 };
 }

 // Query products from DynamoDB
 const command = new QueryCommand({
 TableName: process.env.PRODUCTS_TABLE,
 KeyConditionExpression: "pk = :pk",
 ExpressionAttributeValues: {
 ":pk": "PRODUCT#active"
 }
 });

 const response = await docClient.send(command);

 // Return successful response
 return {
 statusCode: 200,
 headers: {
 'Content-Type': 'application/json',
 'Access-Control-Allow-Origin': '*'
 },
 body: JSON.stringify(response.Items)
 };
 } catch (error) {
 console.error('Error:', error);
 return {
 statusCode: 500,
 body: JSON.stringify({ error: 'Internal server error' })
 };
 }
};
</code></pre>
<h3>Building a Production-Ready React Component</h3>
Modern React applications should handle loading states, errors, and implement proper data fetching strategies. Here's an example of a well-structured React component:
<pre class="language-javascript"><code>import { useQuery, UseQueryResult } from '@tanstack/react-query';
import { Product } from './types';

const ProductList: React.FC = () =&gt; {
 const {
 data: products,
 isLoading,
 isError,
 error,
 refetch
 }: UseQueryResult&lt;Product[], Error&gt; = useQuery({
 queryKey: ['products'],
 queryFn: async () =&gt; {
 const response = await fetch(process.env.REACT_APP_API_ENDPOINT);
 if (!response.ok) {
 throw new Error(`HTTP error! status: ${response.status}`);
 }
 return response.json();
 },
 staleTime: 5 * 60 * 1000, // Consider data fresh for 5 minutes
 retry: 2
 });

 if (isLoading) {
 return &lt;LoadingState /&gt;;
 }

 if (isError) {
 return &lt;ErrorState error={error} onRetry={refetch} /&gt;;
 }

 return (
 &lt;div className="container mx-auto p-4"&gt;
 &lt;h1 className="text-2xl font-bold mb-4"&gt;Products&lt;/h1&gt;
 &lt;ProductGrid products={products} /&gt;
 &lt;/div&gt;
 );
};

export default ProductList;
</code></pre>
<h2>Advanced Topics</h2>
<h3>Environment-Specific Configuration</h3>
Modern applications require different configurations for development, staging, and production environments. Here's how to manage this:
<ul>
<li>Create environment-specific files:</li>
</ul>
<pre class="language-javascript"><code>.env.development
.env.staging
.env.production
</code></pre>
<ul>
<li>Configure environment variables in Vercel:</li>
</ul>
<pre class="language-javascript"><code>vercel env add REACT_APP_API_ENDPOINT
vercel env add AWS_REGION
</code></pre>
<ul>
<li>Set up AWS parameters:</li>
</ul>
<pre class="language-javascript"><code>aws ssm put-parameter \\
 --name "/myapp/prod/api-key" \\
 --value "your-api-key" \\
 --type "SecureString"
</code></pre>
<h3>Implementing Security Best Practices</h3>
<ul>
<li>JWT Authentication:</li>
</ul>
<pre class="language-javascript"><code>const authenticateRequest = (event: APIGatewayProxyEvent): boolean =&gt; {
 const token = event.headers.Authorization?.split(' ')[1];
 if (!token) return false;

 try {
 const decoded = verify(token, process.env.JWT_SECRET!);
 return true;
 } catch (error) {
 return false;
 }
};
</code></pre>
<ul>
<li>API Gateway Authorization:</li>
</ul>
<pre class="language-javascript"><code>functions:
 getProducts:
 handler: handler.getProducts
 events:
 - http:
 path: products
 method: get
 authorizer:
 name: jwtAuthorizer
 type: token
 identitySource: method.request.header.Authorization
</code></pre>
<h3>Monitoring and Observability</h3>
<ul>
<li>AWS X-Ray Integration:</li>
</ul>
<pre class="language-javascript"><code>import { captureAWSClient } from 'aws-xray-sdk';

const client = captureAWSClient(new DynamoDBClient({}));
</code></pre>
<ul>
<li>Custom Metrics:</li>
</ul>
<pre class="language-javascript"><code>const recordMetrics = async (
 metricName: string,
 value: number,
 dimensions: Record&lt;string, string&gt;
) =&gt; {
 const cloudwatch = new CloudWatchClient({});
 await cloudwatch.send(new PutMetricDataCommand({
 Namespace: 'MyApplication',
 MetricData: [{
 MetricName: metricName,
 Value: value,
 Dimensions: Object.entries(dimensions).map(([Name, Value]) =&gt; ({
 Name,
 Value
 }))
 }]
 }));
};
</code></pre>
&gt;&gt; Read more:
<ul>
<li>Mastering <a href="https://reliasoftware.com/blog/react-server-actions">React Server Actions for Optimizing Data Fetching</a></li>
<li><a class="seoquake-params-link" href="https://reliasoftware.com/blog/react-suspense" data-ved="2ahUKEwiUh5OqidmKAxVwzDgGHX1wMsMQFnoECB0QAQ">React Suspense for Mastering Asynchronous Data Fetching</a></li>
</ul>
<h2>Scaling Strategies</h2>
<h3>Lambda Optimization</h3>
<ul>
<li>Provisioned Concurrency:</li>
</ul>
<pre class="language-javascript"><code>functions:
 getProducts:
 provisionedConcurrency: 5
</code></pre>
<ul>
<li>Connection Pooling:</li>
</ul>
<pre class="language-javascript"><code>const pool = new Pool({
 max: 20,
 idleTimeoutMillis: 30000,
 connectionTimeoutMillis: 2000,
});
</code></pre>
<h3>Edge Function Deployment</h3>
<ul>
<li>Configure Edge Functions in Vercel:</li>
</ul>
<pre class="language-javascript"><code>export const config = {
 runtime: 'edge'
}
</code></pre>
<ul>
<li>Implement Cache Control:</li>
</ul>
<pre class="language-javascript"><code>export default function handler(req: Request) {
 return new Response(JSON.stringify({ data }), {
 headers: {
 'Cache-Control': 's-maxage=60, stale-while-revalidate'
 }
 })
}
</code></pre>
<h2>Conclusion</h2>
Building serverless React applications with AWS Lambda and Vercel represents a powerful approach to modern web development. You can create strong, scalable apps that meet today's web demands by using TypeScript, implementing correct error handling, and adhering to security best practices.
Remember to:
<ul>
<li>Use <a href="https://reliasoftware.com/blog/build-a-type-safe-backend-with-nestjs-prisma-pothos-graphql">TypeScript for improved type safety</a></li>
<li>Implement proper error handling and loading states</li>
<li>Follow security best practices</li>
<li>Set up comprehensive monitoring</li>
<li>Optimize for performance using edge functions and caching strategies</li>
</ul>
The serverless approach, when implemented correctly, provides a solid foundation for building applications that can scale seamlessly while maintaining high performance and cost efficiency.
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&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!
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This post guides you to build serverless React applications with AWS Lambda and Vercel,&nbsp;using TypeScript, correct error handling, and security best practices.

How to Build A Serverless React App with AWS Lambda and Vercel?

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Building A Serverless React App with AWS Lambda and Vercel

Explore the React roadmap, including component syntax, advanced custom hooks, performance optimization, concurrent mode, server-side rendering, and more.

React Roadmap for Frontend Developers At Every Level | Relia Software

React Roadmap for Frontend Developers At Every Level 

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React Roadmap for Frontend Developers At Every Level

As your React application grows, ensuring that every component, hook, and API call works seamlessly becomes crucial. Enter <a href="https://reliasoftware.com/blog/what-is-unit-testing">unit testing</a>&mdash;your first line of defense against unexpected bugs and performance issues. Whether you're testing a component's UI rendering or verifying complex custom hooks with Jest, mastering these React unit testing best practices will boost your application's stability and scalability.
In this guide, we will focus on how to unit test React components, <a href="https://reliasoftware.com/blog/mastering-react-hooks">custom hooks</a>, and API fetch calls, along with snapshot testing for renderers. These techniques will help you build robust tests that keep your code clean and prevent bugs from sneaking into production.
&gt;&gt;&nbsp;Read more:&nbsp;
<ul>
<li>Mastering <a href="https://reliasoftware.com/blog/react-context-api">React Context API for Streamlined Data Sharing</a></li>
<li>Demystifying <a href="https://reliasoftware.com/blog/react-redux">React Redux for Centralized State Management</a></li>
</ul>
<h2>Why Unit Testing Matters in React Development?</h2>
Key benefits of unit testing React applications:
<ul>
<li>Early detection of bugs: Unit tests allow you to catch issues in <a href="https://reliasoftware.com/blog/react-component-library">React components</a> and custom hooks early in <a href="https://reliasoftware.com/blog/software-development-life-cycle-sdlc">the development cycle</a> before they affect users.</li>
<li>Maintainable codebase: By adding tests, you safeguard your project from regressions during refactoring code or adding new features.</li>
<li>Confidence in refactoring: Well-tested code makes it easier to update React components and custom hooks without the fear of breaking functionality.</li>
<li>Scalability of testing: As projects grow, unit testing scales by isolating components, ensuring each part functions independently, which keeps the system modular and easier to maintain.</li>
</ul>
When working on a React project, especially one that scales with multiple components, hooks, and APIs, unit tests become critical. They help maintain the quality of your application by ensuring that new features or bug fixes don't introduce regressions.
<h2>Setting Up React Unit Tests for React Applications</h2>
<h3>Installing Jest and React Testing Library</h3>
To begin unit testing in React, install Jest and React Testing Library to run tests and simulate user interactions efficiently.
<pre class="language-javascript"><code>npm install --save-dev jest @testing-library/react
</code></pre>
Update the <code>package.json</code> to include a test script:
<pre class="language-javascript"><code>"scripts": {
 "test": "jest"
}
</code></pre>
With this configuration, you&rsquo;re now set to write and run tests for your React components, hooks, and API fetch calls, ensuring all parts of your application work as expected.
<h3>Organizing Test Files in Your React Project</h3>
To keep your tests organized and maintainable, store them close to the code they test. This structure makes it easier to locate and maintain both your code and tests.
Example folder structure:
<pre class="language-javascript"><code>src/
 components/
 Button.js
 Button.test.js
</code></pre>
For larger projects, consider grouping tests by feature or using a dedicated <code>tests/</code> directory for better scalability. Keeping tests accessible and aligned with your code structure ensures that your project remains easy to manage as it grows.
<h2>Unit Testing for React Components</h2>
When testing&nbsp;React components, focus on what the user sees rather than internal logic. Tests should verify how a component behaves based on props, state, and user interactions, rather than how the component is implemented internally.
Example: Testing Component UI and Props
<pre class="language-javascript"><code>import { render, screen } from '@testing-library/react';
import MyComponent from './MyComponent';

test('renders component with correct text', () =&gt; {
 render(&lt;MyComponent text="Hello World" /&gt;);
 expect(screen.getByText(/Hello World/i)).toBeInTheDocument();
});
</code></pre>
This test ensures that the component renders the expected output based on its props. By focusing on the rendered UI, you ensure that your test will remain stable even if internal logic changes.
<h2>Unit Testing for&nbsp;React&nbsp;Hooks</h2>
Hooks often drive the business logic of React components, making them critical to test. If your hook&rsquo;s logic is independent of the component, it&rsquo;s better to test it directly using Jest and React Testing Library&rsquo;s <code>renderHook</code> from its hooks testing extension.
Example: Testing Custom Hook Logic
<pre class="language-javascript"><code>import { renderHook, act } from '@testing-library/react-hooks';
import { useMyCustomHook } from './useMyCustomHook';

test('should increment value', () =&gt; {
 const { result } = renderHook(() =&gt; useMyCustomHook());
 act(() =&gt; {
 result.current.increment();
 });
 expect(result.current.count).toBe(1);
});
</code></pre>
In this case, we&rsquo;re testing a custom hook that increments a counter. The act function ensures that state changes are applied immediately, allowing us to verify the logic synchronously.
&gt;&gt;&nbsp;Read more: Mastering <a href="https://reliasoftware.com/blog/asynchronous-testing-with-react-testing-library">Asynchronous Testing with React Testing Library</a>
Mermaid Decision Tree:
<pre class="language-javascript"><code>graph TD
 A[Do You Need to Test Hook Behavior?]
 A --&gt;|Yes| B[Is Hook Logic Independent?]
 A --&gt;|No| E[Test Component Behavior]
 B --&gt;|Yes| C["Test Hook Directly (renderHook)"]
 B --&gt;|No| D[Test via Component]
</code></pre>
<figure class="image align-center"><img src="https://api.reliasoftware.com/uploads/mermaid_decision_tree_545af71f47.webp" alt="Diagram for Deciding When to Test Hooks Directly" width="748" height="407">
<figcaption>Diagram for Deciding When to Test Hooks Directly</figcaption>
</figure>
<h2>Mocking Fetch Calls in React Unit Tests</h2>
Many React applications rely on API fetch calls to display dynamic data. Mocking these API calls is essential for keeping your tests fast, reliable, and independent of external services.
<div class="dark bg-gray-950 contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative">
<div class="flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9">
<pre class="language-javascript"><code>jest.mock('./api', () =&gt; ({
 fetchData: jest.fn(() =&gt; Promise.resolve({ data: 'mockData' }))
}));
</code></pre>
By mocking the API with Jest, you ensure that your tests aren&rsquo;t affected by network conditions or external data changes. You can simulate different responses to test how your component handles both success and failure scenarios.
<h2>Snapshot <a href="https://reliasoftware.com/blog/react-test-renderer">Testing for Component Renderers</a></h2>
Snapshot testing is particularly useful for verifying the UI output of a React component at a given point in time. Snapshots compare the current rendered output with a saved version to ensure no unexpected changes occur.</div>
<div class="flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9">
<pre class="language-javascript"><code>import { render } from '@testing-library/react';
import MyComponent from './MyComponent';

test('renders component correctly', () =&gt; {
 const { asFragment } = render(&lt;MyComponent /&gt;);
 expect(asFragment()).toMatchSnapshot();
});
</code></pre>
Snapshots are ideal for static components where the output is consistent across renders. However, use snapshots cautiously for dynamic or frequently updated UI components, as changes to props or data may make snapshots more difficult to maintain.
<h2>Ensuring Coverage and Performance of React Unit Testing with Jest</h2>
<h3>Test Coverage in Jest</h3>
Jest provides built-in tools to measure test coverage, ensuring your unit tests cover critical parts of your React application. Coverage metrics include statements, branches, functions, and lines, offering a detailed view of which areas of your code are tested.
<pre class="language-javascript"><code>jest --coverage
</code></pre>
<h3>Balancing Test Speed and Depth</h3>
As your application grows, it's essential to balance comprehensive testing with performance. Increasing test depth&mdash;covering more edge cases&mdash;can slow down execution.
The solution is to mock expensive operations (like API calls or database interactions) while ensuring core logic is thoroughly tested. This approach helps maintain fast test execution without sacrificing test quality.
</div>
</div>
<figure class="image"><img style="display: block; margin-left: auto; margin-right: auto;" src="https://api.reliasoftware.com/uploads/speed_depth_tradeoff_4455a2657b.webp" alt="Trade-Off Between Test Speed and Depth" width="750" height="536">
<figcaption>Trade-Off Between Test Speed and Depth</figcaption>
</figure>
<h2>Conclusion</h2>
React unit testing with Jest and React Testing Library is crucial for ensuring the stability and scalability of your application. By focusing on testing components, hooks, API fetch calls, and rendered UI, you build a foundation for a robust and reliable codebase. Mocking API calls helps keep your tests efficient, while snapshot testing ensures UI consistency over time.
Start small and scale your testing strategy as your application grows. Consistency is key&mdash;regularly writing and maintaining tests will help ensure long-term code quality and reliability in your <a href="https://reliasoftware.com/blog/react-project-ideas">React projects</a>.
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a>&nbsp;for more information

Learn how to implement React unit testing using Jest and React Testing Library. Master best practices for testing components, custom hooks, API calls, and snapshots.

Implement React Unit Testing with Jest and React Testing Library | Relia Software

React Unit Testing with Jest and React Testing Library

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