Postman Tutorial Part 41 – Dynamic Variables in Postman – Make Selenium Easy

We have seen three types of variables in Postman :-

  1. Global Variable
  2. Environment Variable
  3. Collection Variable

In this post, we will see Dynamic Variables in Postman. As the name says, it generates random data for your API. It is more like Random library in programming language to generate random number , timestamp or alphanumeric or alphabets. It helps a lot to hit an API with different data randomly every time.

Suppose you need to pass an integer number ranging between 1 to 1000, to a field in JSON request. You just need to pass “{{$randomInt}}“. See example below:-

For every run, a new value will be generated and pass in response.

Note:- Dynamic variables can not be used in Pre-request and Tests scripts. A dynamic variable starts from ‘$’. You can only use them in the {{..}} format in the request URL , headers and body.

Like this Postman provides so many dynamic variables. I will list some important dynamic variables here:-

Variable Name Description Examples
$randomAlphaNumeric A random alphanumeric character 6 , “y” , “z”
$randomBoolean A random boolean value (true/false) true , false
$randomInt A random integer between 1 and 1000 802 , 494 , 200
$randomFirstName A random first name Ethan , Chandler , Megane
$randomNamePrefix A random name prefix Dr. , Ms. , Mr.
$randomPhoneNumber A random 10-digit phone number 700-008-5275 , 494-261-3424 , 662-302-7817
$randomWeekday A random weekday Thursday , Friday , Monday
$randomMont A random month February , May , January
$randomEmail A random email address Pablo62@gmail.com

All dynamic variables with examples can be found here.

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My name is Amod Mahajan and I am an IT employee with 6+ years of experience in Software testing and staying in Bengaluru. My area of interest is Automation testing. I started from basics and went through so many selenium tutorials. Thanks to Mukesh Otwani as his tutorials are easy and cover basics to advance. I have habit of exploring concepts by deep diving. I used to make notes. I thought of sharing my knowledge through posts and now I am here. #KeepLearning #ShareLearning Skip back to main navigation