what is API testing?

It uses an operating system, an application, or other services to access its features and data. In this respect, an API is essentially a tool that allows developers to interface with a certain programme or retrieve data from it. API testing verifies that the output of the first program/database is correct, well-structured, and usable to another application. The return value is determined by API testing (response). Data behaviour should be determined by the input (request) parameter, the length of time it takes for the API to obtain the value, the type of authentication necessary, and whether sensitive data is transported securely over the network.

API means application programming interface is a software that allowed to applications to talk to each other. It is a software testing that test the programming. API testing is one of the most challenging part of the software because it worked to ensure that our digital life's run in an increasingly efficient manner . Different types of API testing like load testing , creativity testing ,security testing , functionality testing etc. This test are performed either directly on the API or in other testing.