Chaining request data in Postman - Test Execution Trace

Test Overview

This test sends two API requests in Postman. It verifies that data from the first response is correctly used in the second request, ensuring chaining of request data works.

Test Code - Postman

Postman

pm.test("Chaining request data test", function () {
    // First request: Get user info
    pm.sendRequest("https://jsonplaceholder.typicode.com/users/1", function (err, res) {
        pm.expect(err).to.be.null;
        pm.expect(res).to.have.property('status', 200);
        const userId = res.json().id;
        pm.expect(userId).to.eql(1);

        // Second request: Get posts by userId from first response
        pm.sendRequest({
            url: `https://jsonplaceholder.typicode.com/posts?userId=${userId}`,
            method: 'GET'
        }, function (err2, res2) {
            pm.expect(err2).to.be.null;
            pm.expect(res2).to.have.property('status', 200);
            const posts = res2.json();
            pm.expect(posts.length).to.be.greaterThan(0);
            // Check that all posts belong to userId
            posts.forEach(post => {
                pm.expect(post.userId).to.eql(userId);
            });
        });
    });
});

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman test runner is ready to execute the test script	-	PASS
2	Send first GET request to https://jsonplaceholder.typicode.com/users/1	Browser/Postman sends HTTP GET request to user API endpoint	Check response status code is 200	PASS
3	Parse JSON response and extract userId	Response body contains user data with id=1	Verify userId equals 1	PASS
4	Send second GET request to https://jsonplaceholder.typicode.com/posts?userId=1 using extracted userId	Postman sends HTTP GET request to posts API with userId query parameter	Check response status code is 200	PASS
5	Parse JSON response and verify posts belong to userId=1	Response body contains array of posts with userId=1	Verify posts array length > 0 and each post.userId equals 1	PASS
6	Test ends successfully	All assertions passed, test completes	-	PASS

Failure Scenario

Failing Condition: If the first request fails or returns wrong userId, or second request returns no posts or posts with wrong userId

Execution Trace Quiz - 3 Questions

What does the first request in this test do?

A Send posts data to server

B Fetch user data and extract userId

C Delete a user

D Update user information

Key Result

Always verify that data extracted from one API response is correctly passed and used in subsequent requests to ensure reliable chaining.