Why Postman is essential for API testing - Test Execution Impact

Test Overview

This test checks if a simple GET request to a public API endpoint using Postman returns a successful response. It verifies that the API is reachable and responds with status code 200.

Test Code - Postman

Postman

GET https://jsonplaceholder.typicode.com/posts/1

// In Postman, send the GET request and verify the response status code is 200.

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Open Postman application	Postman interface is ready for creating requests	-	PASS
2	Create a new GET request to 'https://jsonplaceholder.typicode.com/posts/1'	Request tab shows the URL and GET method selected	-	PASS
3	Click the 'Send' button to execute the request	Postman sends the request to the API server	-	PASS
4	Receive response from API	Response tab shows status code 200 and JSON body with post data	Verify response status code is 200	PASS
5	Verify response body contains expected keys like 'userId', 'id', 'title', 'body'	Response JSON is displayed with expected keys	Check presence of keys in response JSON	PASS

Failure Scenario

Failing Condition: API endpoint is unreachable or returns error status code

Execution Trace Quiz - 3 Questions

What is the first step when testing an API with Postman?

A Check the database directly

B Open Postman and create a new request

C Write code to call the API

D Restart the API server

Key Result

Using Postman for API testing helps testers quickly send requests and verify responses without writing code, making API testing accessible and efficient.