Unparalleled suite of productivity-boosting Web APIs & cloud-based micro-service applications for developers and companies of any size.


The 10 Best API Testing Tools You Must Have in 2023

The 10 Best API Testing Tools You Must Have in 2022

Application programming interface (API) is a critical aspect of software development. It allows your web app to communicate with data and other software systems. Most of the apps that you are using rely on interconnected API products. You need to ensure their proper operation. Otherwise, it can compromise the entire service. That’s why you need to find a good API testing tool. It will help you to quickly catch bugs with minimal human input. There are plenty of solutions available online. But which are the best API testing tools for 2023? In this article, you will find 10 of the top testing tools on the market. Let’s take a look at them.

What Are The 10 Best API Testing Tools For 2023?

  1. ReadyAPI
  2. Katalon Studio
  3. Postman
  4. REST-Assured
  5. JMeter
  7. Swagger.io
  8. TestGrid
  9. HttpMaster
  10. Tricentis

ReadyAPI - The Best API Testing Tool for 2022

1. ReadyAPI – The Best API Testing Tool For 2023

ReadyAPI is the next-generation API testing platform. It supports automated API functional testing, load testing, and security testing. Hence, you get all the essential tools in a single platform. ReadyAPI is very easy to implement in any environment. It helps you to integrate API testing into your CI/CD pipeline during every build. It enables you to ensure end-to-end quality for all web services.


  • Supports Command-line for automated testing.
  • Promotes code reusability.
  • Provides native support for Git, Jenkins, Docker, Azure, etc.
  • Enables parallel execution of functional tests and job queuing.
  • Enables you to eliminate dependencies when performing testing and development.

Read: What’s an API?

Katalon Studio - A Great Tool for Running API Tests

2. Katalon Studio – A Great Tool For Running API Tests

Katalon Studio is a hassle-free API testing tool. It enables you to simplify and automate tests for web services, applications, and mobile apps. Also, you can use it for exploratory testing. Besides, Katalon Studio is built for continuous testing. It allows you to seamlessly integrate the API into your ecosystem. Hence, you can transform automated testing into continuous testing


  • Supports SOAP and RESTful requests.
  • Allows you to perform automated and exploratory testing.
  • Supports CI/CD integration.
  • Provides pre-built and customizable code templates.
  • Supports data-driven testing methods.

Postman API testing tool

3. Postman – One Of The Most Popular API Testing Tools

Postman is an API development environment. It is divided into three parts: Collections, Workspaces, and Built-in Tools. With Postman Collections, you can run requests and tests. Also, you can efficiently debug code. Besides, it lets you effortlessly create automated tests. On the other hand, Postman workspace supports collaboration. Hence, you can share the Collections with your team. Finally, Postman offers built-in tools. They support every stage of the API lifecycle.


  • Supports both automated testing and exploratory testing.
  • Allows you to extract API data using the Postman interface.
  • Supports different formats, including Swagger and RAML (RESTful API Modeling Language).
  • Allows you to write Boolean tests.
  • Very easy to use.


4. REST-Assured – One Of The Best API Testing Tools For Java

Testing and validating REST services in Java is harder than the dynamic languages, like Ruby and Groovy. This is where REST-Assured comes into play. It simplifies the testing of Java REST web services. REST-Assured is an open-source tool. Hence, you don’t have to spend a single penny to use it. Also, it is user-friendly. You don’t have to be an HTTP expert to use it. Overall, it is one of the best tools for testing APIs in Java.


  • Offers seamless integration with the Serenity automation framework.
  • Provides built-in functionalities for helping you perform the tests with less code.
  • Doesn’t require you to have HTTP expertise for using the tool.
  • Supports a variety of commands explicitly, including POST, GET, PUT, DELETE, OPTIONS, and PATCH.
  • Supports Given/When/Then test notation for instantly making your tests human-readable.


5. JMeter – One Of The Most Popular Open-Source API Testing Tools

JMeter is an open-source tool. You can use it for functional API testing. Also, it helps you to perform load and performance testing. You can even use it as a unit testing tool for JDBC database connections. JMeter offers a wealth of functionalities. By using them, you can enhance the API testing process. Overall, it is one of the best API testing tools available online.


  • Enables you to perform load and performance testing of different applications, servers, and protocols.
  • Cross-platform support allows you to use various programming languages, including Java and JavaScript.
  • Supports test result replay and per-threaded cookie.
  • Allows you to customize the features based on your requirement.
  • Offers a user-friendly interface for testing.


6. ACCELQ – One Of The Best Cloud-Based API Testing Tools

ACCELQ is a cloud-based continuous testing tool. It allows you to seamlessly automate API and web testing without writing any code. It can save you 70% of the cost associated with maintenance efforts. Thanks to the application of AI technology. ACCELQ intelligently adapts to unexpected changes. Hence, development and testing teams around the world love to use ACCELQ. Also, it heavily emphasizes on design and user experience. Hence, you will find it to be very intuitive and comprehensive. For these reasons, ACCELQ has become one of the top testing tools on the market.


  • Offers API test automation on the cloud with zero coding.
  • Supports Defect tracking technology.
  • Allows you to perform end-to-end validation with chain API tests.
  • Offers seamless CI/CD and Jira/ALM integration.
  • Automatically generates test cases using AI.


7. Swagger.io – One Of The Best API Testing Tools For Functional API Testing

Swagger is a web-based API testing tool. It allows you to perform API security testing and functional testing. Also, it lets you perform API performance testing. Swagger helps you through every stage of the API lifecycle. It simplifies API development for users, teams, and enterprises. Because of this, it is regarded as one of the best API testing tools for 2023.


  • Allows you to conveniently inspect API response and requests.
  • Enables you to validate schema rules by importing the user’s API definitions.
  • Automatically generates assertions against endpoints and injects synthetic data into parameters.
  • Allows you to easily create API documentation.
  • Support all types of services such as REST, SOAP, GraphQL, etc.



8. TestGrid – One Of The Top API Testing Tools For 2023

TestGrid is a lightweight API testing tool. It offers a minimalistic user interface design. It offers 70% faster performance than the traditional API automation process. As a result, you can test and release your application faster. Also, the API tool is very easy to use. It doesn’t have any pre-requisite of programming knowledge. As a result, it is recognized as one of the top API testing tools for 2023.


  • Easy to use tool with a smooth learning curve.
  • Allows you to run performance tests for optimizing and improving your API.
  • API Integration Automated Testing.
  • Enables you to monitor transactions.
  • Offers scriptless testing for faster automation.
  • Enables continuous testing integration with CI/CD tools.


9. HttpMaster – One Of The Top API Testing Tools On The Market

HttpMaster is a tool for API testing and development. It can create batches of connected requests. Hence, you can completely automate REST API or website workflow. Also, HttpMaster can work as a universal HTTP tool. You can use it for testing HTML forms. Besides, it offers an easy-to-use interface and compact installation package. On top of that, it does not require you to have advanced technical skills. As a result, HttpMaster has become one of the best API test tools on the market.


  • Allows you to create batches of connected requests to completely automate REST API.
  • Supports a variety of formats, including XML and JSON.
  • Allows you to define response data validation rules.
  • Supports parallel execution.
  • Enables you to import OpenAPI data.

Read: What Is an API Key?

Tricentis - One of the Best API Testing Tools for 2022

10. Tricentis – One Of The Best API Testing Tools For 2023

Tricentis offers a suite of test automation tools. By using them, you can efficiently perform software testing. For example, you can utilize Tricentis Tosca for model-based test automation. It optimizes and accelerates end-to-end testing of your entire digital landscape. Tricentis Tosca is powered by AI. Hence, it can effectively take the bottlenecks out of testing. Overall, it is a good API testing tool.


  • Supports a wide range of protocols such as HTTP, Rabbit MQ, SOAP, REST, etc.
  • Can be integrated into the Agile and DevOps Cycle.
  • Supports model-based test automation for easy script maintenance.
  • Offers end-to-end testing for helping you run API tests across mobile, cross-browser, and packaged apps.
  • Supports a wide range of testing, including exploratory testing, regression testing, and performance testing.

Is It Very Important To Find The Best API Testing Tools?

The best API testing tools help you to automate the testing process. They can automatically identify the flaws in your code. Hence, they can help you to save a lot of time. The API test tools analyze the performance of your API. It helps you to ensure high reliability and security. That’s why it’s very important to find a trusted API testing tool. It can make your life a lot easier.


What tool is used for API testing?

Software development teams use a variety of API testing tools, such as ReadyAPI, Katalon Studio, Postman, etc.

Is REST API a tool?

Yes, REST API is a tool. It helps your apps to securely exchange information over the internet.

Is Selenium An API testing tool?

No, Selenium is not a tool for API testing. It is an open-source framework for automating test browsers.

Can we test API without Postman?

You can test API without postman by utilizing other test tools, like ReadyAPI and Katalon Studio.

Can JMeter be used for API testing?

Yes, you can use JMeter for API testing. It is a very popular tool. You can utilize it for performing functional API testing, load testing, and performance testing.

Apilayer offers a suite of API tools. They are very easy to integrate into web apps. Try them now for free by signing up here.

Related posts

The Best Free APIs to Use in 2024 for Your Business


App Store Search API: How To Optimize Your App's Visibility


What is an API? Understanding All the Key Factors


How To Rewrite And Enhance Any Article Using Paraphraser AI

Leave a Reply

Your email address will not be published. Required fields are marked *