Best API Testing Tools Open Source Online List

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 API testing automation tools which you can use to automate REST & SOAP APIs API Testing Tools.

Best API Testing Tools

There are a number of API testing tools available to assist developers in their work. They vary in terms of the features they offer, their ease of use, and even their price. However, some are more comprehensive than others, while others provide greater value than others. Here’s a look at how three tools stack up against each other and what you can expect from them.

1. HP QTP (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 

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

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.

4. SOAP UI

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

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

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

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. Runscope

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.

9. 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.

Conclusion:

When you’re creating an API, you need to make sure that it’s going to be easy for your clients to use. The tools listed in this blog post will help you automate testing and also provide the insights on your API so that you can make improvements. You can either implement these APIs in your product or use them as a starting point for new ideas.

In Our blog we have also shared frequently asked rest api interview questions & restful api interview questions. You can refer those questions for crack the upcoming testing jobs.

In Your organziation if you are using any other API testing tools , then let us know in the comment section so that we can update that in out API Testing Tools list.