How to send a postman Get-Request with params as response-array of another request

Question

I'm trying to send 2 Get-Requests with Postman in which the response 1 was used for request 2, as follows:

• Request_1: GET: https://jsonplaceholder.typicode.com/posts
• Response_1: is a JSON with multi-data of:

    {   "userId": 1,
        "id": 6,
        "title": "dolorem eum magni eos aperiam quia",
        "body": "ut aspernatur ... "
    },
    {
     ... 

There are many of them. So i have many userId from 1 to 10.

Now i want to take all userId of Response_1 and put it in to Request_2 by using Params in Postman:

• Request_2: GET: https://jsonplaceholder.typicode.com/comments?postId={{testID}}

How can i take all userId of Response_1 in to the Request_2 with pair Key : Value like that. Many thanks.

Answer 1

in first request test section add:

 pm.environment.set("useridArray",pm.response.json().map((a)=>a.userId))

here we are getting userid from each object using map function , the map function returns an array.

now in second request prerequest use:

let testIDArray = pm.environment.get("useridArray")
pm.environment.set("testID",testIDArray.pop())
pm.environment.set("useridArray",testIDArray)
testIDArray.length ? postman.setNextRequest(pm.info.requestName) : postman.setNextRequest(null)