Timestamp generation in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a timestamp in software testing?

A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day.

beginner

How can you generate a current timestamp in Postman?

You can generate a current timestamp in Postman using JavaScript code like var timestamp = Date.now(); which returns milliseconds since January 1, 1970.

intermediate

Why use timestamps in API testing?

Timestamps help track when requests are sent or responses received, ensure data freshness, and avoid replay attacks by making each request unique.

intermediate

What is the difference between Unix timestamp and ISO 8601 format?

Unix timestamp is a number representing seconds or milliseconds since 1970-01-01 UTC. ISO 8601 is a readable string format like 2024-06-01T12:00:00Z representing date and time.

intermediate

How to use timestamps in Postman pre-request scripts?

In pre-request scripts, you can create a timestamp and save it as an environment variable to use in your request, for example:<br>pm.environment.set('currentTimestamp', Date.now());

Which JavaScript method returns the current timestamp in milliseconds in Postman?

A Date.getTime()

B Date.now()

C new Date().timestamp()

D getTimestamp()

Date.now() returns the current time in milliseconds since January 1, 1970.

Why is it useful to add a timestamp to API requests?

A To make requests unique and prevent replay attacks

B To slow down the server

C To change the API endpoint

D To encrypt the request

Adding timestamps helps ensure each request is unique and can prevent replay attacks.

Which format is a Unix timestamp?

A A date written as 'June 1, 2024'

B A string like '2024-06-01T12:00:00Z'

C A number representing seconds or milliseconds since 1970-01-01 UTC

D A random string of letters

Unix timestamp is a numeric value counting seconds or milliseconds from 1970-01-01 UTC.

How do you store a timestamp in Postman environment variables?

A pm.response.set('timestamp', Date.now());

B pm.variables.get('timestamp');

C pm.request.timestamp = Date.now();

D pm.environment.set('timestamp', Date.now());

Use pm.environment.set() to save a value like a timestamp in environment variables.

What does Date.now() return?

A Milliseconds since January 1, 1970

B Current date as a string

C Seconds since January 1, 2000

D A formatted date object

Date.now() returns the number of milliseconds elapsed since January 1, 1970 UTC.

Explain how to generate and use a timestamp in Postman pre-request scripts.

Think about JavaScript code and environment variables in Postman.

Describe why timestamps are important in API testing and give an example.

Consider security and data freshness.