Response size in Postman - Test Execution Trace

Test Overview

This test sends a GET request to an API endpoint and verifies that the response size is within the expected limit.

Test Code - Postman

Postman

pm.test("Response size is less than 500KB", function () {
    const responseSize = pm.response.size().body;
    pm.expect(responseSize).to.be.below(500 * 1024);
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman app is open with the test script loaded	-	PASS
2	Sends GET request to the API endpoint	Request sent, waiting for response	-	PASS
3	Receives response from the server	Response received with status 200 and body content	-	PASS
4	Calculates response body size in bytes using pm.response.size().body	Response size calculated	Response size is less than 512000 bytes (500KB)	PASS
5	Assertion checks if response size is below 500KB	Assertion executed	pm.expect(responseSize).to.be.below(500 * 1024)	PASS

Failure Scenario

Failing Condition: Response body size is 500KB or more

Execution Trace Quiz - 3 Questions

What does the test verify about the API response?

A The response status code is 404

B The response size is less than 500KB

C The response contains a specific JSON key

D The response time is under 1 second

Key Result

Always verify response size to ensure API responses are efficient and within expected limits, preventing performance issues.