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12 Popular API Testing Tools

April 18, 2017
api testing, rest api testing tool, test api,api testing tools,

To ensure stable product, testers around the globe participate in different functional testing. But for most of these tests, all actions are taken on the Presentation layer and the response from the system/ application is verified. Even though testing the presentation layer is an easy approach, it relies heavily on the user interface of the application. But with API testing you can directly target the business layer of the application and test the core features of the application without depending on the user interface. For this reason, API testing is considered to be a great testing methodology for projects with frequent releases. In this post, we would list down 10 API testing automation tools which you can use to automate REST & SOAP APIs.


website: https://saas.hpe.com/en-us/software/uft

HP’s Unified Functional Testing is a great tool for testing all the APIs in your application. As API testing doesn’t require the presentation layer, UFT can be used to directly access the business layer of the application and test the request and response of the APIs and validate them. Along with the business layer, UFT can also be used to test the database layer thus helping to create an all round testing solution for the underlying application components. That’s not all, using its test conversion tool, you can even convert existing API tests (ideally soapUI) into UFT API tests.

2. HttpMaster 

website: http://www.httpmaster.net/

HttpMaster is a great tool which allows you to automate web application as well as help you to automate API testing. Using this tool you can chain different requests for REST API calls and use data validations to verify responses. You can choose from the standard HTTP verbs and mold the tool according to your test APIs’ need and requirement. It has an elegant data upload support which allows you to post various content type, while the response data viewers increase the readability of XML, JSON, HTML, CSS responses.

3. vREST

website: https://vrest.io/

This tool provides an online solution for automated testing of your APIs, mocking them and automated recording and creating a specification for HTTP APIs & REST APIs. Using it you can quickly test different APIs, without requiring excessive technical efforts. You can even generate complete documentation of your API specifications using vREST. The API mocking feature along with Mock Server allows developers to mock existing APIs and start development at a quicker pace. While the API mocking can be used by testers to validate multiple request-response at a quicker pace.


website: http://www.soapui.org/

SOAP UI by Smart Bear is a cross-platform open source functional testing tool which allows you to test your application’s underlying APIs. This tool automatically fabricates test cases from the API request and allows you to write complex request validation scripts using Groovy. That’s not all you can even organize your test cases in different test suites and can even manage requirements and perform analysis for test coverage. You can even mock APIs and create a report after test execution.

5. Parasoft

website: https://www.parasoft.com/

Parasoft provides you an interface to create complex scenarios and test APIs, database and mainframes of your application, at one go. Using this tool, you can create easily maintainable and extendable tests with 100% coverage. That’s not all, you can even create scripts without writing a single line of code. You can create sophisticated validation checks and run them continuously. It has support for all major platforms, protocols, and technologies. It is easy to install and work with and simplifies your approach towards API testing.

6. TestingWhiz

website: http://www.testing-whiz.com/

Using TestingWhiz, you can automate your API tests without writing a single line of code. It allows you to mock APIs and even test REST & SOAP web services over HTTP or FTP. Apart from API testing using Testing Whiz, you can perform functional, UI and database testing of your application. Thus using a single tool you can bring all your tests under one roof. It can be integrated with different defect tracking tool like JIRA, Mantis, etc. to automatically log defects. After every test suite execution, it can be configured to send test reports and execution summary over mail.

7. SOAPSonar

website: http://www.crosschecknet.com/products/soapsonar.php

SOAPSonar is a robust tool which allows you to thoroughly test your application using different testing methodologies. By using this tool you can test the different web services used in your application. Be it HTML, XML, SOAP, REST, or JSON, SOAPSonar can cover it all. Once you create web service-specific test scripts and group them in different suites, you can utilize SOPAPSonar’s vibrant reporting feature to publish reports in different formats. It can also be integrated with HP’s Quality Centre.

8. TestMaker

website: http://www.pushtotest.com/testmaker-open-source-testing

It is an open source tool which can be used to test different web services as well as monitor their performance. TestMaker is run using Jython, i.e. Python written in Java. Using this tool you can use your existing Selenium tests, SoapUI tests or Sahi tests written in Groovy, Java, Python, PHP, Ruby or Perl in functional, load or performance tests. TestMaker also has a dashboard which can be used to monitor tests which are currently running and the status of the finished tests.

9. Runscope

website: https://www.runscope.com/

Using Runscope you can verify whether your application APIs are sending correct response. You can even monitor the performance of these responses. Each test execution creates rich test report which properly describes the reason for each test failure. To ensure fast reporting, the tool can be integrated with HipChat, Webhooks, Slack or PagerDuty, so that team members are instantly notified if any API goes down or sends a wrong response. The tool also assists you to create complex test data for complex requests. Using Runscope you can even test APIs and backend services of mobile apps.

10. WebInject

website: http://www.webinject.org/

It is a free tool which can be used to create functional, acceptance and regression tests of web applications and web services. It is a Perl based command-line tool which can be run on all platforms with a Perl interpreter. Using WebInject you can monitor the real-time status of web services and their respective response times. Post-test execution you can extract the report in HTML or XML format. You can use the WebInject plugin to integrate it with other tools.

11. Rapise

website: https://www.inflectra.com/Rapise/

Rapise is a powerful automation tool which can be used to automate REST/ SOAP web services. It is built upon an open & flexible architecture and can be used for functional testing of web applications as well. The tool uses HTTP methods to test API responses for a variety of requests. You can configure test reporting using Rapise and can execute multiple tests in parallel.

12. Storm

website: http://storm.codeplex.com/

Using Storm you can automate only SOAP web services. It is an open source tool and can be used to test web services written using Java or .NET. Using Storm, you can invoke different web service methods having complex input parameters. You can edit SOAP requests and test multiple web services from its user interface. It is easy to use and can be downloaded for free.

About the author

arindam bandyopadhyay author

Arindam Bandyopadhyay is an automation tester with over 5 years of experience in software testing. While during the day he juggles between Eclipse and spreadsheets, at night he lets his fingers do the talking as he writes about anything and everything his paradoxical mind desires.

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