http://www.gcreddy.com/2018/05/api-testing.html
Introduction to Application Programming Interface Testing, API Testing Checklist, API Testing versus Web Services Testing and API Testing versus Unit Testing. API Test Environment Setup, API Test Scenarios API Testing Challenges and API Testing Tools.
Overview of API Testing Tools like SoapUI, Postman, HP-UFT, HttpMaster, Parasoft, Karate, Rest-assured, Rest Console, Pyresttest and API Fortress Etc...