Environment switching in Postman - Build an Automation Script

Verify API response changes when switching Postman environments

Preconditions (4)

Step 1: Select the 'Development' environment in Postman

Step 2: Send the GET request to {{baseUrl}}/status

Step 3: Note the response status code and body

Step 4: Switch to the 'Production' environment

Step 5: Send the same GET request again

Step 6: Note the response status code and body

✅ Expected Result: The response status code and body should differ between 'Development' and 'Production' environments, reflecting the different baseUrl values.

Automation Requirements - Postman/Newman

Assertions Needed:

Verify response status code is 200 for both environments

Verify response body contains expected environment-specific data

Verify that the baseUrl variable is correctly used in the request URL

Best Practices:

Use environment variables for base URLs

Use pm.environment.set and pm.environment.get to manage variables

Use pm.test for assertions

Run tests separately for each environment

Avoid hardcoding URLs in requests

Automated Solution

Postman

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

pm.test('Response body contains environment info', function () {
    const responseJson = pm.response.json();
    const env = pm.environment.name;
    pm.expect(responseJson.environment).to.eql(env);
});

The first test checks that the response status code is 200, which means the request was successful.

The second test parses the JSON response and verifies that the 'environment' field matches the current environment name. This confirms that the request used the correct baseUrl from the environment.

These tests should be run separately with the 'Development' and 'Production' environments selected in Postman to verify environment switching.

Common Mistakes - 3 Pitfalls

Hardcoding the API URL instead of using environment variables

Not selecting the correct environment before running the test

Not using pm.test assertions to verify response data

Bonus Challenge

Now add data-driven testing by running the same test with three different environments: Development, Staging, and Production.

Show Hint