8 Best API Testing Tools in 2022

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Over the past few years, APIs have become the centre of software development. For example, you can use APIs to communicate between systems and exchange data. Today, majority applications are API-based.

API testing allows teams to begin testing an application’s core functionality before the user interface is ready and identify errors. If identified later, these errors can be costly to fix, requiring large amounts of code to be rewritten, along with delaying the product’s release. As different testing teams have varying needs, choosing the ideal testing tool or a combination of them considering specific requirements is necessary. 

We’ve listed 8 best API testing tools to help you pick ‘the one’ for work!


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The most known name in the domain, Postman, allows setting up a collection and using Newman to run it. It is a browser plug-in for Google Chrome and has assertion capabilities. Postman has a rich interface, making it easy to use and the best possible choice for non-coders. The tool can be used for both automation and exploratory testing.

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Insomnia is a well-known REST client for Mac, Windows, and Linux. It can be used for testing RESTful as well as GraphQL APIs. The free, cross-platform desktop framework incorporates a user-friendly interface and offers features like security helpers, code creation, and environment variables.

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Testim Automate

Testim makes it easy to create and execute automated tests for APIs. Moreover, it provides a range of assertions and verifications that can be used to validate the results of your API tests. This tool allows developers to create API tests with an automated, easy-to-use graphical interface. 

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Soap UI

This feature-rich tool enables testing web services REST and SOAP APIs. The free package grants users access to the full source code, and the fixed package lets you take API testing a bit further. For interactive/exploratory testing, Soap UI is a particularly great tool. Moreover, since it is Java-based, it works with majority operating systems.

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REST Assured

The Java library for testing and validating the Restful Web Services supports Behavior-Driven Development (BDD) syntax like Given, When, and Then notations. In addition, it also helps integrate with testing frameworks like Junit or TestNG.

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Karate DSL

Karate DSL allows testing REST APIs using domain-specific language. With this tool, it’s possible to create tests that verify the status and compare response JSON without losing the readability of the spec code. 

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A highly customisable tool that has gained significant popularity over the past few months. It has a clean and modern UI that makes creating API requests fast and easy. So, if you don’t want to install hassle-bloated software on your machine, this tool is for you.

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Citrus Framework

Launched in 2009, the tool has matured highly over the years and has become a go-to tool to test headless technologies beyond REST services. The Citrus Framework creates tests using Java or MXL. Moreover, it can help you automate integration tests for any messaging protocol or data format.

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Tasmia Ansari
Tasmia is a tech journalist at AIM, looking to bring a fresh perspective to emerging technologies and trends in data science, analytics, and artificial intelligence.

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