Output block in Postman - Build an Automation Script

Verify the output block in Postman test script

Preconditions (2)

Step 1: Send the API request

Step 2: Go to the Tests tab in Postman

Step 3: Write a test script that captures the response body

Step 4: Use the output block to log the response status and body

Step 5: Run the request and observe the output block in the Postman console

✅ Expected Result: The Postman console shows the response status code and the response body logged correctly in the output block

Automation Requirements - Postman test scripts (JavaScript)

Assertions Needed:

Verify response status code is 200

Verify response body contains expected keys or values

Best Practices:

Use pm.response to access response data

Use console.log for output block logging

Write clear and simple assertions

Keep test scripts readable and maintainable

Automated Solution

Postman

pm.test('Status code is 200', () => {
    pm.response.to.have.status(200);
});

const responseBody = pm.response.json();
console.log('Response Status:', pm.response.code);
console.log('Response Body:', responseBody);

pm.test('Response body has userId', () => {
    pm.expect(responseBody).to.have.property('userId');
});

This script first checks if the response status code is 200 using pm.test and pm.response.to.have.status. Then it parses the response body as JSON and logs the status code and body to the Postman console using console.log, which acts as the output block. Finally, it asserts that the response body contains a key named userId. This approach helps verify the API response and outputs useful information for debugging.

Common Mistakes - 3 Pitfalls

Using console.log outside of test scripts

Not parsing response body before accessing properties

Hardcoding status code without assertion

Bonus Challenge

Now add data-driven testing with 3 different API endpoints and verify their status codes and output blocks

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