API Performance Testing using Apache Jmeter Part 1

What is API TESTING?

API (application programming interface) testing is a type of software testing that performs verification directly at the API level. It is a part of integration testing that determines whether the APIs meet the testers’ expectations of functionality, reliability, performance, and security. Unlike UI testing, API Testing is performed at the message layer without GUI.


Specify the API output status
The most common API output you need to verify in API testing is the response status code.
Verifying if the response code equals to 200 or not to decide whether an API testing is passed or failed is familiar to new API testers.
There are five values for the first digit:
• 1xx (Informational): The request is received and continues to be processed
• 2xx (Successful): The request is successfully received, understood, and accepted
• 3xx (Redirection): Further action needs to be taken to complete the request
• 4xx (Client Error): The request contains the wrong syntax or cannot be fulfilled
• 5xx (Server Error): The server fails to fulfill an apparently valid request
However, the actual response status code of an API is specified by the development team that built the API. So as a tester, you need to verify whether:
• The code follows global standard classes
• The code is specified in the requirement.

API Method
Get: Read
Post: Create
PUT: Update/Replace
Patch: Partially Update
Delete: Delete

Let’s See some of request Method and input type

http://dummy.restapiexample.com/
https://reqres.in/