We have seen three types of variables in Postman :-
- Global Variable
- Environment Variable
- 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 | [email protected] |
All dynamic variables with examples can be found here.
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