Status code assertion in Postman - Build an Automation Script

Verify API returns status code 200 for GET /users

Preconditions (2)

Step 1: Open Postman

Step 2: Create a new GET request to https://api.example.com/users

Step 3: Send the request

Step 4: Observe the response status code

✅ Expected Result: The response status code should be 200

Automation Requirements - Postman Tests (JavaScript)

Assertions Needed:

Verify response status code is 200

Best Practices:

Use pm.response.to.have.status() for status code assertion

Write clear and simple test scripts

Keep tests independent and focused

Automated Solution

Postman

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

This test script uses Postman's built-in pm object to check the response status code.

pm.test defines a test with a descriptive name.

pm.response.to.have.status(200) asserts that the response status code equals 200.

This is simple and clear, making it easy to understand and maintain.

Common Mistakes - 3 Pitfalls

Using incorrect assertion method like pm.response.status === 200 without pm.test

Hardcoding status code in multiple places instead of using variables

Not checking status code at all and only validating response body

Bonus Challenge

Now add data-driven testing with 3 different API endpoints and verify each returns status code 200

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