10 API Testing Tools You Can’t Live Without in 2022

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Matching the expectations is one of the most important things for a software company. And, API testing tools are all about checking if your software or application meets the expectations.

These expectations can be about the functionality, security, reliability and performance. Nevertheless, for successful testing API automation test is critical.

Manual testing can be error prone and daunting so, automation is crucial to improve testing efficiency for the development team.

Furthermore, automated API testing can be integrated with your continuous integrated pipeline. This is excellent for improving code quality and detecting bugs early in the software development lifecycle.

Therefore, it is pivotal to have the right processes and tools for API testing. And, here I will explain the best API testing tools that you should know in 2022.

But, since there are so many tools, let us first find out how you can find the best one out there.

How to choose the best API testing tool for you?

Here are some tips on how you can choose the perfect API testing tool for you. The methods are easy and you can find the best tool without any hassle.

  • Easy-to-use interface
  • Ability to integrate the tool with your continuous integration pipeline
  • Ability to group API requests and group them into suitable collections
  • Quick synchronization and sharing options for teams
  • Ability to run asynchronous tests for improving execution time
  • Ability to generate API documentation directly

So, here are the top picks for the API testing tools that you can’t live without in 2022.

1. SoapUI

SoapUi is a headless tool for functional testing that enables testing of web services REST and SOAP APIs. It provides both a free package and a fixed package.

The free package only lets users access the full source code. On the other hand, the fixed package can enable you to do a lot more in terms of API testing.

API Testing Tools
Soap UI

So, let’s dive in to take a look at the features these two provide separately.

Free Package

This package is perfect if you have a limited budget or you are just starting out with automated API testing. Its features include:

  • The reusable scripts provide the ability to load tests for functional test cases and reuse security scans.
  • Quick and simple creation of tests with drag-and-drop and point-and-click functionality.

Fixed Package

Even though it has some cost, the added features are worth your buck.

  • Supports asynchronous testing
  • Data driven testing
  • Integrated API security testing
  • REST, SOAP, JDBC, GraphQL and JMS testing
  • Synthetic data generation

2. Apigee

A cross-cloud API testing tool, Apigee lets users access its features using different editors like Swagger. Moreover, it can also measure and test API performance.

It is powered by JavaScript and is a multistep tool. Here are its features:


  • Compatible with APIs containing huge data
  • Ability to identify issues related to the performance by tracking API traffic, response time, and error rates
  • With the help of OpenAPi specification and its deployment in the cloud, Apigee enables the creation of API proxies

3. Postman

Hitting the market initially as a Google Chrome plugin, Postman‘s main objective was to test API services. Presently, Postman has its services expanded to both Mac and Windows ecosystems.

Postman API Testing Tools
Postman API Testing Tools

Therefore, if you are looking for a manual or exploratory testing, Postman can be a great choice. You can keep track of API, run requests and perform debugging using Postman.


  • Comprises of built-in tools, workspaces and collections
  • Supports various formats including Swagger and RAML
  • Enables writing boolean tests
  • Allows interface to extract web API data
  • Isn’t based on command line

4. Rest Assured

Rest Assured, as the name suggests, is an API testing tool that facilitates testing of REST services. It is a JAVA domain-specific language and an open-source tool that is designed to make REST testing simpler.

Furthermore, it provides added support when it comes to using Apache Johnzon.


  • Coding from scratch isn’t necessary due to its built-in functionalities
  • Several authentication mechanisms are provided
  • The Serenity Automation Framework provides seamless integration
  • No extensive knowledge of HTTP is required
  • Single framework has both REST tests and UI

5. Testim

Actually, Testim is a full-blown test automation platform and API testing is only a subset of it. One fascinating thing about Testim is that it uses AI to help create, execute and maintain test suites.

Testim APL Testing Tools
Testim APL Testing Tools


  • AI framework learns maintenance and execution activities with each test suite
  • Enables creating API actions and validations for standard testing activities
  • Ability to isolate UI testing by extracting data from API to test the UI and API in parallel

6. Hoppscotch

Hoppscotch started as Postwoman, an alternate to the famous Postman API testing tool. Later on, the name changed, but it is still a very good open-source API testing tool.

Hoppscotch claims to be a minimalistic and lightweight tool and offers functionalities that make API testing easier.


  • Send GraphQL queries
  • Send and receive data with a SocketIO server
  • Ability to establish a full-duplex communication channel over a single TCP connection
  • HTTP connection enables stream server to send events
  • Ability to publish and subscribe topics of an MQTT Broker

7. Karate DSL

Karate DSL helps users accomplish creating scenarios for API-based tests without needing to write down the steps and definitions. Furthermore, it has self-created definitions so that the users can quickly get into API testing.


  • Includes async capability-based support for WebSocket
  • Supports multithread parallel execution and configuration switching/staging
  • Ability to execute test cases using Java
  • User can write scripts in Java, JSON and XML

8. Assertible

Focusing mainly on reliability, Assertible is popular among newer developers. Moreover, it supports automation testing of APIs in every step.



  • Supports running of API tests after deployment
  • Offers integration with tools such as Slack, GitHub, and Zapier
  • Supports HTTP responses and their validation with turnkey assertions

9. API Fortress

API Fortress eases the building, automation, and execution of functional and performance testing. In due course, it is the most powerful SOAP and REST monitoring tool and also is really easy to use.


  • Increased transparency reduces removes silos and eliminates redundancies
  • Perfect UI for novices
  • Offers one-click test integration
  • Compatible with both cloud and physical hardware

10. JMeter

JMeter was first created to perform load testing and now it has evolved into a popular API testing tool. It is compatible with both dynamic and static resources for performance testing.


  • Includes API tests with CI pipelines with the integration between Jenkins and JMeter
  • Also works with CSV files
  • Enables teams to create unique test parameter values