Top 12 API Testing Tools for Software Testing Process

APIs (Application Programming Interfaces) are computer codes that allow information and functions to transfer between modern apps. However, to ensure proper operation, APIs need to be extensively examined, and this is where API testing tools come in.

This article introduces the 12 best API testing tools and their key features. After reading this article, you may have an overview of popular API automation testing tools recently to make a good decision for your project.

>> Read more: What is An API? An Ultimate Guide for API Development

What Are API Testing Tools?

API testing tools are unique software applications that test API functionality, dependability, performance, and security. Such solutions let testers and developers adapt their API test methodology and enable software components to communicate with one another.

While simulating an API request and answer, these tools help find differences in data to figure out where the issue is and whether it can handle errors or not. The most popular API testing tools only offer manual and automated testing, making them essential for modern apps.

Best API Testing Tools List For Developers

Postman

Postman is a popular tool for API development, testing, and management. It has a user-friendly interface, a large feature set, and extensive support, making it a popular choice among developers of all skill levels, especially beginners.

Highlight Features:

• Tests Many API Types: Postman can test APIs that use different protocols, like HTTP, HTTPS, REST, GraphQL, WebSocket, OAuth, and SOAP.
• Creates API Documentation: Postman can turn your tests into API documentation. Both API builders and users can benefit from this.

Katalon Studio

Katalon Studio, a new product in the API testing industry, offers several beneficial features to simplify the API testing process for developers. The simplicity of this tool makes it suitable for beginners who have started to get used to API tests.

Highlight Features:

• More Thorough Testing: Katalon Studio can leave external data for better testing. A broader test makes it easier to test and give more reliable results.
• Verified Test Results: Katalon Studio provides clear test results, including pass/fail, length, etc. This clarifies how APIs operate.
• Free Use: This is one of the free API testing tools popular for developers. Its free plan still includes essential features for the testing process.

Apigee

The Google Cloud API management platform Apigee is powerful. It includes tools for API design, security, deployment, monitoring, and analysis. Apigee can help major enterprises and startups manage APIs and provide great user experiences.

Highlight Features:

• Test Workflows: Apigee can develop multi-step API tests. You can test your APIs in more sophisticated circumstances.
• Tracks API Performance: Apigee may track API response time, traffic capacity, and failures. This helps you find and fix performance issues.

Rest Assured

Rest Assured is a popular open-source Java API testing library. This tool makes building and running automated tests for REST-based web services easier. It also helps developers and testers read, maintain, and enjoy API testing.

Highlight Features:

• Simple to Use with Java: Rest Assured makes testing Java programs straightforward. Developers can write tests using their Java skills.
• Testing using Less Code: Rest Assured streamlines API requests and checks. It reduces code writing and saves programmers time.

Assertible

Being a cloud-based platform, Assertible simplifies API testing and monitoring for developers. API developers and testers may utilize its user-friendly UI and comprehensive features to ensure API health and stability.

Highlight Features:

• Automatic Tests: Assertible runs API tests automatically while developing. This ensures your API works and your tests are always current.
• Monitoring APIs: Assertible can monitor your API and notify you of issues. You can spot problems early and fix them swiftly.
• Easy for Beginners: Assertible's visual interface makes test creation and management simple for non-coders.

ACCELQ

ACCELQ is a top cloud-based platform for API testing, automation, and management. It is designed to empower developers and testers with a codeless approach. Moreover, ACCELQ also speeds up API testing and ensures accuracy by using AI.

Highlight Features:

• All-in-One Testing Tool: ACCELQ can test APIs for security, functionality, and performance under demand. You won't need numerous tools for different testing activities.
• AI Aids Testing: ACCELQ speeds up test writing with AI. It can automatically construct API-specific tests.

ReadyAPI

ReadyAPI by SmartBear simplifies API and web service functional, security, and performance testing. It provides developers and testers with a feature-rich environment to ensure API quality and dependability.

Highlight Features:

• Tests APIs Thoroughly: ReadyAPI can test your API's functionality, security, and performance under high traffic.
• Works with API Documentation: ReadyAPI helps you develop tests faster using API documentation. You may also share and reuse your tests.

Karate Labs

Karate Labs is a sophisticated and open-source API testing tool that simplifies API testing. Karate DSL's natural language syntax makes tests easier to create, interpret, and understand than standard programming languages. Testers and developers can collaborate and reduce the learning curve for new users.

Highlight Features:

• Focuses on API Calls: Karate simplifies API calls by allowing you to focus on what data to give and what response to expect. This clarifies each test's purpose.
• Tests with Different Data: Karate may test your API with many different scenarios using data from other sources. This reveals further API flaws.
• Can Fake Parts of Your API: Karate can test API components by creating fake versions. This lets you test parts of your API alone or pretend other systems are connected.

Testsigma

Testsigma offers a single platform for API testing and other testing tasks. It supports testers with little coding skills and automation framework developers.

Highlight Features:

• AI Speeds Up Testing: Testsigma uses artificial intelligence (AI) to speed up testing. For example, it can generate API-specific tests on its own.
• All Testing in One Place: Testsigma evaluates APIs, mobile apps, websites, and desktop programs on one platform. That way, you don't need to use many testing tools.
• Thorough Checks: Testsigma checks status codes, data, and content kinds in API responses. All API layer function calls are checked.

Insomnia

This is a powerful and open-source API testing tool, taking on all API development, testing, and debugging tasks. If familiar with its UI and large functionality, even new developers and testers will find it easy to use.

Highlight Features:

• Supports Many APIs: Insomnia tests all HTTP, SOAP, and GraphQL SOMs. They enable flexibility for complex operations and don't require one tool per API type.
• Makes Building Requests Easy: API creation is handled by Insomnia. The site address, method (GET or POST), and data can be specified through this app.

Cypress

Cypress is a popular open-source test automation framework that was created primarily for modern online applications. While Cypress is primarily designed for user interface (UI) testing, it also has unexpected API testing capabilities.

Highlight Features:

• For UI Testers: Cypress makes testing APIs easy if you know how to test web pages. This reduces tool learning time.
• Works with Your Existing Tests: Cypress can test APIs and web pages simultaneously. This delivers a more thorough picture of application performance.
• Easy to Write Tests: Cypress writes tests in familiar Javascript code, making them easy to understand and adapt.
• Built-in Requests: Cypress contains a command to send API requests from tests. It saves time and effort for developers.

API Fortress

API Fortress is a strong and comprehensive framework that streamlines API testing. It offers developers and testers a feature-rich environment for API test building, running, and management.

Highlight Features:

• Automatic Tests: API Fortress can perform API tests during development. This lets you catch API errors early and often, saving time.
• Specifications: API Fortress can test APIs created in various ways, including HTTP, SOAP, and GraphQL.
• Security Checks: API Fortress can help you find and fix API security vulnerabilities before they become a problem.

>> Read more:

• Top 6 Automation Testing Tools for Businesses 
• Top 10 Best End-to-End Testing Tools and Frameworks
• Top 20 Open-Source Unit Testing Frameworks For Developers
• Top 15 Application Monitoring Tools For Businesses
• Top 9 Modern Software Development Tools for Businesses
• Top 10 Automated Code Review Tools For Developers

Conclusion

This article examined various API testing tools, showcasing their features for different purposes. From user-friendly options for novices to feature-rich platforms for extensive testing, there is a tool to help you design strong APIs. Remember that selecting the correct tool and prioritizing consistent testing throughout development is critical to ensure API quality and a smooth user experience.

>>> Follow and Contact Relia Software for more information!