Response time in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the response time unit in Postman test scripts?

In Postman test scripts, the response time is accessed using pm.response.responseTime. What unit is this value measured in?

Postman

console.log(pm.response.responseTime);

A Nanoseconds

B Milliseconds

C Microseconds

D Seconds

💡 Hint

Think about how fast computers measure time and what is practical for API response times.

Postman measures response time in milliseconds because it is precise enough for API testing and easy to interpret.

❓ assertion

intermediate

Which assertion correctly checks if response time is under 500ms?

You want to write a Postman test to verify the API response time is less than 500 milliseconds. Which assertion is correct?

A pm.test('Response time is less than 500ms', () => { pm.expect(pm.response.responseTime).to.be.below(500); });

B pm.test('Response time is less than 500ms', () => { pm.expect(pm.response.responseTime).to.be.above(500); });

C pm.test('Response time is less than 500ms', () => { pm.expect(pm.response.responseTime).to.equal(500); });

D pm.test('Response time is less than 500ms', () => { pm.expect(pm.response.responseTime).to.be.at.least(500); });

💡 Hint

Look for the assertion that checks the value is smaller than 500.

The assertion uses to.be.below(500) to confirm the response time is less than 500 milliseconds.

🧠 Conceptual

advanced

Why is monitoring response time important in API testing?

Choose the best reason why response time monitoring is critical in API testing.

A To verify the API meets performance expectations and user experience standards

B To ensure the API returns correct data formats

C To check if the API endpoints are documented properly

D To confirm the API uses secure authentication methods

💡 Hint

Think about how slow responses affect users.

Response time monitoring helps ensure the API is fast enough to provide a good user experience and meets performance goals.

🔧 Debug

advanced

Identify the error in this Postman test for response time

This Postman test is intended to fail if response time exceeds 1000ms. What is wrong with it?

Postman

pm.test('Response time is acceptable', () => {
  pm.expect(pm.response.responseTime > 1000).to.be.false;
});

A pm.response.responseTime is undefined in Postman tests

B The comparison operator should be >= instead of >

C The expression inside pm.expect is a boolean, but pm.expect expects a value to chain assertions on

D The test should use pm.response.time instead of pm.response.responseTime

💡 Hint

Check what pm.expect expects as input.

pm.expect expects a value to assert on, not a boolean expression. The correct way is to assert on the value directly with a matcher.

❓ framework

expert

How to integrate response time checks in a Postman Collection Runner with multiple requests?

You want to fail the entire Postman Collection run if any request takes longer than 800ms. Which approach is best?

A Use the Collection Runner settings to set a global timeout of 800ms for all requests

B Manually check response times after the run and rerun failed requests

C Write a pre-request script to abort the request if the previous response time was over 800ms

D Add a test in each request to check response time and set a collection variable if it exceeds 800ms; then add a final test in a separate request to fail if that variable is set

💡 Hint

Think about how to track failures across multiple requests in Postman.

Setting a collection variable when a request exceeds the threshold allows a final test to fail the run if any request was slow.