10 API Testing Tools for Developers (Including Their Benefits)

By Indeed Editorial Team

Published March 3, 2022

Testing is an important part of application and program development. API testing tools help developers and programmers troubleshoot and uncover program errors. Choosing the right API testing tools can help you speed up the time and efficiency of testing. In this article, we discuss the definition of API testing tools, provide you with a list of 10 tools you can use and include a few tips to help you choose the best tools.

What are API testing tools?

Application programming interface (API) testing tools measure how well different applications and programs communicate with each other. API testing tools evaluate the different requests that each program sends to the other, identifying if they're in the right format and if they effectively communicate the intention and needs of the user. The goal of API testing tools is to find out how well a certain program works.

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10 API testing tools

Here is a list of 10 API testing tools for developers and programmers to consider, including how they may help you develop your professional skills:

1. Apigee

Apigee is a cross-cloud API testing tool that uses JavaScript. This tool is capable of checking large amounts of data, offering the ability to easily identify coding and communication errors. It also has tools to track common website problems like traffic or response times. Learning how to use Apigee can help you develop and demonstrate your troubleshooting skills.

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2. SoapUI

SoapUI allows the user to complete API testing right within the program. It also allows users to input hypothetical scenarios to find out how the system responds. It provides in-depth data that developers can use to improve their site. Learning how to use SoapUI helps to strengthen your analytical skills and your ability to predict errors.

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3. Testim

Testim is a comprehensive testing tool with many built-in features, including one for API testing. Testim uses artificial intelligence to assist with testing coding and maintaining websites. Learning how to use Testim can help beginner developers develop quality control and problem-solving skills. It can also help with improving teamwork within coding as the tool offers team management capabilities.

4. Postman

Postman has a variety of tools to monitor and debug APIs. Postman is beginner-friendly and doesn't require that you learn a new coding language to use the tools within the program. This tool also doesn't require you to copy and paste code. Instead, it works by automatically testing sites using a Google Chrome plugin called Postman Interceptor. Learning Postman can be a great starting point for learning how to use other API testing tools.

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5. Katalon

Katalon is a full-service API testing tool that's also compatible with testing desktop and mobile apps. It allows users to test SOAP and REST requests, which is the process of how a server requests and responds to messages. This tool also supports continuous integration (CI) and continuous delivery (CD) integrations, which are how messages are sent. Even with the in-depth tools, Katalon is user-friendly and suitable for beginning developers. Learning how to use Katalon can be a good starting point for learning more in-depth tools.

6. Assertible

Assertible has a variety of useful tools built into the program, including the ability to validate HTTP responses. This tool allows users to test API at multiple levels and also the ability to test even after deployment. It also easily integrates with Slack, allowing teams to troubleshoot together. Learning how to use Assertible is beneficial because it demonstrates your ability to test APIs even after delivery.

7. Karate DSL

Karate DSL is an API testing tool that lets you create scenarios and then test them. This tool also allows users to test commands without first listing step definitions. The program has already input these step definitions, reducing the time it takes to run API testing. Learning how to use Karate DSL can demonstrate test automation skills.

8. Rest Assured

Rest Assured makes it easy to test REST services, which includes the performance, scalability and modifiability of a program. This open-source tool specifically uses Java to improve the speed and efficiency of REST API testing. Many of the built-in tools also save time during API testing by not requiring users to create code from scratch. Rest Assured is also easy to use and great for beginners as it doesn't require a lot of HTTP knowledge. Learning Rest Assured can be a great starting point for learning more in-depth API tasks.

9. Parasoft

Parasoft is an API tool that allows for automated testing. It has built-in tools that cover different stages in the development cycle. It also helps developers check website security and has the ability to test applications on mobile devices. Learning how to use Parasoft can help you develop skills in website security and troubleshooting.

10. API Fortress

API Fortress is an all-inclusive API testing tool that allows users to build, execute and automate functional testing. It also allows for easy monitoring of SOAP and REST API testing. This open-source testing tool is typically an alternative to Postman. Learning API Fortress is good for expanding on basic API testing skills to include more in-depth reviews.

Tips for choosing the best API testing tools

Here are a few tips for choosing the best API testing tools:

  • Measure your skill level: Different API testing tools require different levels of experience, and evaluating your comfort level using certain coding languages can help you choose the best one. Consider the coding languages you're most comfortable using and your level of experience in testing to choose one that is at your skill level.

  • Consider your integration needs: Many API testing tools integrate with other tools which can help with project management tasks. Consider your brand's integration needs and choose an API testing tool that is compatible with existing tools, such as the ability to communicate or share testing results via different communication platforms.

  • Identify team members' duties: Some developers work on coding and testing together in teams, which requires programs that have good built-in collaboration and tracking tools. If you work on a large team, you may want to choose an API testing tool with quick sharing options and the ability to save and update others on progress.

  • Evaluate your data analytics needs: While most API testing tools have built-in data analytics capabilities, some are better than others. Consider how much detail you want your API testing tools to provide you when it comes to data analytics.

Please note that none of the products mentioned in this article are affiliated with Indeed.

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