POSTMAN - Save a property value from a JSON response

Question

I am new to both JSON and Postman(as of yesterday).

I'm trying to do something very simple, I've created a GET request which pulls in a list of forms in a JSON response. I want to take this response and get the first "id" token and place it in a variable.

I am using a global variable but would like to use a collection variable if possible. Either way here is what I am doing.

I've tried several things, most recently this:

var jsonData = JSON.parse(responseBody);
postman.setGlobalVariable("id", jsonData.args.id);

As well as this:

pm.test("GetId", function () {
    var jsonData = pm.response.json();
    pm.globals.set("id", jsonData.id);    
});

Response code looks like this:

{
   "forms":[
      {
         "id":"3197239",
         "created":"2018-09-18 11:37:39",
         "db":"1",
         "deleted":"0",
         "folder":"151801",
         "language":"en",
         "name":"Contact Us",
         "num_columns":"2",
         "submissions":"0",
         "submissions_unread":"0",
         "updated":"2018-09-18 12:02:13",
         "viewkey":"xxxxxx",
         "views":"1",
         "submissions_today":0,
         "url":"https://xxx",
         "data_url":"",
         "summary_url":"",
         "rss_url":"",
         "encrypted":false,
         "thumbnail_url":null,
         "submit_button_title":"Submit Form",
         "inactive":false,
         "timezone":"US/Eastern",
         "permissions":150
      },
      {
         "id":"3197245",
         "created":"2018-09-18 11:42:02",
         "db":"1",
         "deleted":"0",
         "folder":"151801",
         "language":"en",
         "name":"Football Draft",
         "num_columns":"1",
         "submissions":"0",
         "submissions_unread":"0",
         "updated":"2018-09-18 12:11:54",
         "viewkey":"xxxxxx",
         "views":"1",
         "submissions_today":0,
         "url":"https://xxxxxxxxx",
         "data_url":"",
         "summary_url":"",
         "rss_url":"",
         "encrypted":false,
         "thumbnail_url":null,
         "submit_button_title":"Submit Form",
         "inactive":false,
         "timezone":"US/Eastern",
         "permissions":150
      }
   ]
}

user_6028443 · Answer

This would get the first id:

pm.globals.set('firstId', _.first(pm.response.json().forms).id)

That would get the first in the array each time so it would set a different variable it that response changed.

The test that you created was nearly there but the reference needed to go down a level into the forms array:

pm.test("GetId", function () {
    var jsonData = pm.response.json()
    pm.expect(jsonData.forms[0].id).to.equal("3197239")
    pm.globals.set("id", jsonData.forms[0].id)   
})

The [0]is referencing the first id in the first object within the array. For example [1] would get the second one and so on.

You currently cannot set a collection level variable using the pm.* API - These can only be added manually and referenced using the pm.variables.get('var_name') syntax.

Edit:

In the new versions of the desktop app you can set variables at the Collection level using pm.collectionVariables.set().

user_10949600 · Answer

Based on the name or any other attribute if you want to set the id as a global variable then this is the way.


for(var i=0; i

POSTMAN - Save a property value from a JSON response

2 Answers