Support set up API test data using UI testing.Create fluent assertions in BDD style with AssertJ support.Built off of data-driven testing methods better test coverage and reliability.Easily import tests from Swagger (2.0 & 3.0), Postman, WSDL, and WADL.Supports all types of REST, SOAP requests, SSL client certificate.Katalon Studio brings a hassle-free API testing platform for testers with or without prior programming experience. API Testing Framework | API Automation Tools Name The list contains both open-source(free) and premium web API testing tools. Here is a list of top Web Services Testing API Tools. For Agile development, Api Testing becomes important as shorter development cycles put more pressure on automated testing. In API Testing you use software to send calls to the API, get output and log the system’s response. An API or Application Programming Interface is a collection of software functions and procedures through which other software applications can be accessed or executed.