API Testing Tools For Developers (Including Their Features)

By Indeed Editorial Team

Published 28 May 2022

The Indeed Editorial Team comprises a diverse and talented team of writers, researchers and subject matter experts equipped with Indeed's data and insights to deliver useful tips to help guide your career journey.

Testing is an important part of the application and program development process. Application programming interface (API) testing tools help developers and programmers troubleshoot and uncover errors in programs. 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 right 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 are in the right format and if they effectively communicate the intention and requirements of the user. The goal of these testing tools is to find out how well a program works.

10 Tools for API Testing

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

1. SoapUI

SoapUI allows the users 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 sites. Learning how to use SoapUI helps to strengthen your analytical skills and your ability to predict errors.

Related: Essential Web API Interview Questions And Example Answers

2. 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.

Related: Mobile Testing Interview Questions

3. Postman

Postman has a variety of tools to monitor and debug APIs. Postman is beginner-friendly and does not require that you learn a new coding language to use the tools within the program. This tool also does not 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 an appropriate starting point for learning how to use other testing tools.

Related: What Does A Test Engineer Do? Duties And Responsibilities

4. 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 code 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.

Related: What Is The Role Of A Software Development Engineer In Test?

5. 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.

6. Katalon

Katalon is a full-service API testing tool that has the ability to test 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 the processes of sending messages. Even with the in-depth tools, Katalon is user-friendly and suitable for beginning developers. Learning how to use Katalon can be an appropriate starting point for learning more in-depth tools.

Related: What Is A QA Engineer? Job Description And Responsibilities

7. Rest Assured

Rest Assured helps you 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 right for beginners as it does not require a lot of HTTP knowledge. Learning Rest Assured can be an appropriate starting point for learning more in-depth API tasks.

8. 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.

9. 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 useful for expanding on basic API testing skills to include more in-depth reviews.

10. Parasoft

Parasoft is an API tool that allows for automated testing. It has built-in tools that cover different stages of 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.

Tips for choosing the right API testing tools

Choosing the right tools for API testing is important to ensure maximum efficiency in the application and program development process. Here are a few tips for choosing the right testing tools:

Consider your integration requirements

Many testing tools integrate with other tools which can help with project management tasks. Consider your brand's integration requirements 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. Using tools with these capabilities enables you to set up proper workflows with minimal requirement for in-person communication and meet-ups.

Measure your skill level

Different testing tools require different levels of experience, and evaluating your comfort level using certain coding languages can help you choose the right one. Consider the coding languages you are most comfortable using and your level of experience in testing to choose one that is at your skill level. You may also consider the overall skill and experience level of your team if you have the responsibility of choosing an API testing tool for your team.

Evaluate your data analytics requirements

While most testing tools have built-in data analytics capabilities, some are better than others. Consider how much detail you want your testing tools to provide you when it comes to data analytics. This becomes especially important when you want to provide regular updates to management and having your data in the right format is essential.

Identify team members' duties

Some developers work on coding and testing together in teams, which requires programs that have decent 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. These features also reduce the requirement for providing in-person updates and save a lot of time for such teams.

Consider your budget

When selecting an API testing tool, another important consideration for you may be the price of the tool. Some tools are free to use, but these tools usually only offer the basic features. Other tools offer more features and typically have a monthly or yearly subscription fee. You can select the right tool for yourself or your team by finding the one that has all the features you require and also fits within your budget.

Please note that none of the companies, institutions or organisations mentioned in this article are associated with Indeed.

Explore more articles