Using extracted data in next request in Postman - Test Execution Trace

Test Overview

This test sends a first API request to get a user ID, extracts that ID from the response, and uses it in the next API request to fetch user details. It verifies that the user details response contains the correct user ID.

Test Code - Postman

Postman

pm.test("Extract user ID and use in next request", function () {
    pm.sendRequest({
        url: 'https://api.example.com/users',
        method: 'GET'
    }, function (err, res) {
        pm.expect(err).to.be.null;
        pm.expect(res).to.have.property('code', 200);
        const userId = res.json().data[0].id;
        pm.environment.set('userId', userId);

        pm.sendRequest({
            url: `https://api.example.com/users/${userId}`,
            method: 'GET'
        }, function (err2, res2) {
            pm.expect(err2).to.be.null;
            pm.expect(res2).to.have.property('code', 200);
            pm.expect(res2.json().id).to.eql(userId);
        });
    });
});

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test starts and sends GET request to 'https://api.example.com/users' to get list of users	API server is reachable and returns a JSON list of users	Response status code is 200	PASS
2	Extract the first user's ID from the response JSON and save it to environment variable 'userId'	Environment variable 'userId' is set with extracted user ID	Extracted user ID is not null or undefined	PASS
3	Send GET request to 'https://api.example.com/users/{userId}' using extracted user ID	API server returns user details for the specified user ID	Response status code is 200	PASS
4	Verify that the returned user details JSON contains the same user ID as extracted	Response JSON contains user ID matching environment variable	User ID in response equals extracted user ID	PASS

Failure Scenario

Failing Condition: The first API request fails or returns no users, so user ID cannot be extracted

Execution Trace Quiz - 3 Questions

What is the purpose of extracting the user ID in the first request?

A To set the request method

B To verify the response status code

C To use it in the next request URL to get specific user details

D To check the server availability

Key Result

Always extract dynamic data from one API response and reuse it in subsequent requests to create reliable and connected tests.