Creating and storing a dynamic variable

[katiepolo (Katie)]

My question: This might be a weird one but I’ll explain as best I can. I have a test where I need to generate a random string of 2 words and carry this through to the next two tests

I’m trying to use dynamic variables but having the following issue

In the Pre-Request script I am using something like the below

postman.setEnvironmentVariable("generatedCategory", "#{{$randomWord}} {{$randomWord}}");

This sets the environment variable value to #{{$randomWord}} {{$randomWord}} as expected.

The issue is when I use that stored variable in the body of the next test {{generatedCategory}} it generates new random words instead of the same two that were generated previously

Is there a way that after generating those first random words, I can store them to re-use?

Any help will be appreciated

I’ve already tried:

Just a side note - I have previously tried using the {{$randomWord}} dynamic variable in the test body, and pulling the value from the response to use in the next test - issue here is the response format changes, so the values move about in an array.

Eg. On one one test run I could pull and set the values from using:

var jsonData = JSON.parse(responseBody);
postman.setEnvironmentVariable("generatedCategory", jsonData.tags[3]);

and in the next run it was returned in a different object in the array of tags (jsonData.tags[2]) so is not consistent

Hope this makes sense, let me know if you need any more info

[bpricilla (Pricilla B)]

@katiepolo,

Yes, you already did a good job here Still it’s not working because you need to use replaceIn() method here, please refer here for more details about dynamic variables.

Dynamic variables

In your case, under Pre-request script it should as below:

pm.environment.set("generatedCategory", pm.variables.replaceIn('{{$randomWord}} {{$randomWord}}'));

Now you are good to use {{generatedCategory}} variable

I hope this helps!!

[katiepolo (Katie)]

@bpricilla

pm.environment.set("generatedCategory", pm.variables.replaceIn('{{$randomWord}} {{$randomWord}}'));

Thank you so much for this @bpricilla ! This has solved my problem I have been using Postman for a while but love how I’m still learning new things

Thanks again

[bpricilla (Pricilla B)]

@katiepolo I couldn’t agree more to what you said. I feel you, same here I am learning too

All the best