Example requests and responses in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the response status code for a successful GET request?

In Postman, you send a GET request to a valid API endpoint. What status code do you expect in the response for a successful request?

A 200

B 404

C 500

D 302

💡 Hint

Think about the standard HTTP status code for success.

A 200 status code means the request was successful and the server returned the requested data.

❓ assertion

intermediate

Which Postman test script correctly asserts the response body contains a specific key?

You want to check if the JSON response body has a key named userId. Which test script is correct?

A pm.test('Response has userId', () => { pm.response.json().has('userId'); });

B pm.test('Response has userId', () => { pm.expect(pm.response.json()).to.have.property('userId'); });

C pm.test('Response has userId', () => { pm.expect(pm.response.body).to.include('userId'); });

D pm.test('Response has userId', () => { pm.expect(pm.response.json().userId).to.exist; });

💡 Hint

Use pm.expect with to.have.property to check keys in JSON.

Option B correctly uses pm.expect and to.have.property to assert the key exists.

🧠 Conceptual

advanced

What does a 401 HTTP response code indicate in API testing?

When testing an API, you receive a 401 status code. What does this mean?

A The request was successful and data is returned.

B The requested resource was not found on the server.

C The client is not authorized to access the requested resource.

D The server encountered an internal error.

💡 Hint

Think about authentication and permission errors.

A 401 status code means the client must authenticate to get the requested response.

🔧 Debug

advanced

Why does this Postman test script fail with an error?

Look at this test script:

pm.test('Check name', () => { pm.expect(pm.response.json().name).to.equal; });

Why does it fail?

Postman

pm.test('Check name', () => { pm.expect(pm.response.json().name).to.equal; });

A The <code>to.equal</code> assertion is missing the expected value argument.

B The test script is missing a semicolon at the end.

C The <code>pm.response.json()</code> method is incorrect and should be <code>pm.response.body</code>.

D The <code>pm.expect</code> function cannot be used inside <code>pm.test</code>.

💡 Hint

Check the syntax of the assertion method.

The to.equal method requires an argument to compare against. Without it, the test throws an error.

❓ framework

expert

Which Postman feature allows running a collection of requests with different data sets automatically?

You want to test an API with many input values without manually changing each request. Which Postman feature helps you do this?

A Mock Server to simulate responses

B Pre-request scripts to modify headers

C Monitor to schedule requests

D Collection Runner with data files (CSV or JSON)

💡 Hint

Think about running many tests automatically with different inputs.

Collection Runner lets you run a set of requests multiple times using data files to vary inputs.