Dynamic values in body

[Arctomachine]

I want to set dynamic values to json body. But I also want to keep the rest of body from manual input. How to achieve it?
Example:

{
...
"created_at": Date.now(),
"id": crypto.randomUUID(),
"text": btoa(Math.random())
}

I tried bru.setVar, but it says variable is not defined. And when manually defining its value, it is not overwritten by script.
Also tried req.body.id = ... and req.setBody(...), but it has no effect over manually typed body.
And scripts give error about crypto, btoa

[diabolusss]

I'm totally new to Bruno and can't figure out how to do this. It's a very useful feature, and Talend API Tester allows multiple expressions (albeit limited) to generate random data.

[diabolusss]

Placing a valid JS script into a variable doesn't work - it's inserted as plain text into the body. In the tooltip for the variables field, I see a note that a JS Literal Template can be used, but I haven't figured out how to use it yet. for example to run (Math.random() + 1).toString(36).substring(7)

https://www.youtube.com/watch?v=pu1WNjgdD3s

[diabolusss]

Ok, it's actually quite simple:

1. put a pre-request variable with dummy value (e.g. randomStringVal = null or whatever)
2. place variable into body as {{randomStringVal}}
3. add a pre-request script that changes its value
   e.g.

bru.setVar("randomStringVal",randomString)```

https://www.youtube.com/watch?v=DYjSG4CPjo8