The interest in API testing has been growing steadily over the last few years and performed by most of the Q A services provider.

Since there is no GUI for the API's, so the testing is performed at the message layer.

SoapUI and Postman both the tools that used for API testing and both the tools have their own features.

Here are some of the key features of both the tools.

Soap UI: It is open source functional SOAP and REST API testing tool. It allows you to perform automation, functional, regression and load testing.

It creates the test cases directly from the web method requests.

Allows to create the test quickly and easily using the drag and drop, Point and click.

It enables organizing test cases in the test suites.

Postman: It is a browser's plug-in for Google Chrome and used for testing API services. It is a good choice for API testing for those who don't want to do the coding.

It has a rich interface which makes it easy to use.

It can be used for both automation and exploratory testing.

By looking the features of both the tools, we can say that SoapUI is better than Postman tool.

Don’t rely on only one API Testing tool. You need a good mix of tools to ensure your API is tested thoroughly.

Here are some tools you should have in your toolbox:

• JMeter: Load test, performance test, and functional test your APIs with this powerful tool

• Postman: A great testing and debugging tool for RESTful APIs which began as a Google Chrome plug-in, has evolved into one of the most popular API testing tools. With the primary goal of testing API services, it has expanded its services to include native Windows and Mac versions. In either case, it's an excellent choice for exploratory or manual testing. You can use Postman to monitor APIs, automate tests, debug, and run requests. It has a lot of features, it's free, and it's highly rated by users.

• SoapUI

SoapUI is a functional testing tool that is the world's leading SOAP and REST testing solution. It essentially functions as a headless API testing tool. With SoapUI's user-friendly graphical interface and enterprise-class features, you can quickly and easily create and execute automated functional, regression, and load tests. SOAPUI supports a variety of protocols and technologies for testing all types of APIs. The SOAPUI interface is simple to use, so both technical and non-technical users can benefit from it.

• Tricentis Tosca

Tricentis Tosca makes it simple to incorporate continuous testing into Agile and DevOps. It is a software testing tool that supports HTTP, AMQP (Advanced Message Queuing Protocol), SOAP (Simple Object Access Protocol), and many other protocols. Multiple aspects of software testing (test case design, automation, data generation, and analytics) are used in this approach to analyze GUIs and APIs from a business standpoint.