GET request in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the status code returned by this GET request?

You send a GET request to https://jsonplaceholder.typicode.com/posts/1 using Postman. What status code do you expect in the response?

Postman

GET https://jsonplaceholder.typicode.com/posts/1

A 500

B 404

C 301

D 200

💡 Hint

A successful GET request usually returns this status code.

A GET request to a valid resource typically returns status code 200, meaning success.

❓ assertion

intermediate

Which assertion correctly verifies the response body contains a userId of 1?

You receive this JSON response from a GET request:

{"userId": 1, "id": 1, "title": "...", "body": "..."}

Which Postman test script assertion correctly checks that userId equals 1?

A pm.test('UserId is 1', () => { pm.expect(pm.response.json().userId).to.eql(1); });

B pm.test('UserId is 1', () => { pm.expect(pm.response.userId).to.equal(1); });

C pm.test('UserId is 1', () => { pm.expect(pm.response.json().userId).to.be(1); });

D pm.test('UserId is 1', () => { pm.expect(pm.response.body.userId).to.eql(1); });

💡 Hint

Use pm.response.json() to parse JSON response body.

Option A correctly parses the JSON response and uses to.eql(1) to assert equality.

Other options either access wrong properties or use invalid assertion methods.

🔧 Debug

advanced

Why does this Postman test fail with 'TypeError: Cannot read property'?

Test script:

pm.test('Title exists', () => { pm.expect(pm.response.body.title).to.exist; });

What causes the error?

Postman

pm.test('Title exists', () => { pm.expect(pm.response.body.title).to.exist; });

A The test script is missing a semicolon causing syntax error.

B pm.response.body is a string, not an object, so accessing .title causes TypeError.

C pm.response.body is undefined because the request failed.

D The assertion method 'to.exist' is invalid and causes the error.

💡 Hint

Check the type of pm.response.body before accessing properties.

pm.response.body is a raw string, so accessing .title directly causes a TypeError.

Use pm.response.json() to parse the body first.

🧠 Conceptual

advanced

What is the main difference between GET and POST requests in API testing?

Choose the best explanation for the difference between GET and POST requests.

A GET requests send data in the request body; POST requests send data in the URL.

B GET requests always require authentication; POST requests never do.

C GET requests retrieve data without changing server state; POST requests send data to create or update resources.

D GET requests are slower than POST requests because they transfer more data.

💡 Hint

Think about what each request type is used for in APIs.

GET requests are used to fetch data without side effects.

POST requests send data to the server to create or update resources.

❓ framework

expert

Which Postman test script correctly checks that the response header 'Content-Type' includes 'application/json'?

You want to verify the response header 'Content-Type' contains 'application/json'. Which script is correct?

A pm.test('Content-Type is JSON', () => { pm.expect(pm.response.headers.get('Content-Type')).to.include('application/json'); });

B pm.test('Content-Type is JSON', () => { pm.expect(pm.response.headers['Content-Type']).to.equal('application/json'); });

C pm.test('Content-Type is JSON', () => { pm.expect(pm.response.headers.get('content-type')).to.eql('application/json'); });

D pm.test('Content-Type is JSON', () => { pm.expect(pm.response.headers['content-type']).to.include('application/json'); });

💡 Hint

Use the correct method to get headers in Postman scripts and check inclusion.

Option A uses pm.response.headers.get() which is the correct way to access headers.

It also uses to.include() to check substring presence.

Other options either use wrong access or wrong assertion methods.