PATCH request in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding PATCH request purpose

What is the main purpose of a PATCH request in API testing?

A To retrieve data from the server

B To delete a resource from the server

C To partially update an existing resource

D To completely replace a resource with a new one

💡 Hint

Think about updating only some fields instead of the whole object.

A PATCH request is used to partially update an existing resource, changing only specified fields without replacing the entire resource.

❓ Predict Output

intermediate

PATCH request response status code

What HTTP status code should you expect after a successful PATCH request that updates a resource?

A 201 Created

B 200 OK

C 204 No Content

D 404 Not Found

💡 Hint

Successful update usually returns a code indicating success with content.

A successful PATCH request typically returns 200 OK with the updated resource in the response body. 204 No Content is also possible but less common for PATCH.

❓ assertion

advanced

Validating PATCH request response body

You send a PATCH request to update a user's email. Which assertion best verifies the update in Postman test script?

Postman

pm.test('Email updated correctly', () => {
  const jsonData = pm.response.json();
  // Which assertion below is correct?
});

A pm.expect(jsonData.email).to.not.eql('[e-mail]');

B pm.expect(jsonData.email).to.be.undefined;

C pm.expect(pm.response.code).to.eql(404);

D pm.expect(jsonData.email).to.eql('[e-mail]');

💡 Hint

Check that the email field matches the new email you sent.

The assertion verifies that the response JSON's email field equals the updated email, confirming the PATCH worked.

🔧 Debug

advanced

Troubleshooting PATCH request failure

You send a PATCH request but receive a 400 Bad Request error. Which of these is the most likely cause?

A The request body is missing required fields or has invalid JSON format

B The server is down and not responding

C The PATCH method is not supported by the API

D The resource does not exist, so server returns 404

💡 Hint

400 errors usually mean the request data is incorrect or malformed.

A 400 Bad Request means the server could not process the request due to invalid syntax or missing required data in the PATCH body.

❓ framework

expert

Automating PATCH request tests in Postman Collection Runner

You want to automate multiple PATCH requests with different data sets in Postman Collection Runner. Which setup is best?

A Use a CSV or JSON data file with different PATCH payloads and run the collection with data iteration

B Manually edit the PATCH request body before each run

C Create separate collections for each PATCH request variation

D Use Postman monitors without data files to run PATCH requests

💡 Hint

Think about running the same test multiple times with different inputs automatically.

Using a data file with different payloads allows the Collection Runner to iterate tests automatically, making automation efficient.