What are the testing methods that come under API testing?

Question

What are the testing methods that come under API testing?

Answer

One of the most common Web API testing interview questions is about the testing methods. They are: Unit testing and Functional testing Load testing to test the performance under load Discovery testing to list, create and delete the number of calls documented in API Usability and Reliability testing to get consistent results Security and Penetration testing to validate all types of authentication Automation testing to create and run scripts that require regular API calls End to end Integration and Web UI testing API documentation testing to determine its efficiency and effectiveness