Array from variable is sent like a string in Postman

Question

I collected data from the response and pushed it into array in 'Tests'. console.log shows that I received array:

Then I saved it into environment variable to use in the next call. But value in the request was a string, so only the first value was running.

How can I set normal array?

Response from I collected data:

{
  "sent": 0,
  "remaining": 1000000,
  "gifts": [
    {
        "id": 43468,
        "amount": 50000,
        "can_gift_back": true
    },
    {
        "id": 43469,
        "amount": 50000,
        "can_gift_back": true
    }
  ]
}

My code in the "Tests" tab:

let jsonData = pm.response.json();
let gifts = jsonData.gifts;

//calculate array length
function objectLength(obj) {
    var result = 0;
        for(var prop in obj) {
            if (obj.hasOwnProperty(prop)) {
            result++;
            }    
        }
    return result;
}
let arrayLength = objectLength(gifts);

//push response data to the array
var giftsArray = [];
for (var i = 0; i < arrayLength; i++) {
        var giftsIDs = gifts[i].id;
        giftsArray.push(giftsIDs);
    }
pm.environment.set("giftsToCollect", giftsArray);

UPD:

After using code from the answer in different ways I received such issue.

Point 1 from the picture describes the way of behavior when stringify is used

Point 2 describes behavior when stringify is not used 2. Example of request JSON with manually inputed ids

Have you tried wrapping it in a JSON.stringify(giftsArray) when saving it to the environment variable? — Danny Dainton
– Danny Dainton, Commented Mar 5, 2019 at 17:17
@DannyDainton, yes, I tried it in different variants, but it didn't help. — Mika
– Mika, Commented Mar 5, 2019 at 19:13
What does the saved variable look like, could you update with an image of that? Have you tried removing the quotes and brackets around the variable name in your request body? If it's saved in the environment as an array, all the would need is the {{var_name}} syntax. — Danny Dainton
– Danny Dainton, Commented Mar 5, 2019 at 19:27
Saved variable is [5578,5579,5580]. And in the request it is sent that way: gift_ids=[5578,5579,5580,5581,5582,5583,5584,5585,5586,5587] (it's captured request body from Fiddler) instead of every value at different level like at the screen from the my answer. Actually, your code didn't help me... and thanks for a short way to collect IDs :) — Mika
– Mika, Commented Mar 5, 2019 at 20:29

Danny Dainton · Accepted Answer · 2019-03-05 20:03:16Z

4

You could capture all the id values in an array using Lodash, which is an external module that you can use in the Postman application.

Saving the array as a variable after this, is the same as you have done so already but I've added JSON.stringify() around the array value or it will save this as a string.

let giftsArray = []

_.each(pm.response.json().gifts, (item) => {
    giftsArray.push(item.id)
})

pm.environment.set('giftsToCollect', JSON.stringify(giftsArray))

You should then be able to reference the environment variable like this:

gift_ids: {{giftsToCollect}}

I've mocked out the request data locally, just to show you this capturing the values from the data.

answered Mar 5, 2019 at 20:03

Danny Dainton

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Comments

Mika · Accepted Answer · 2019-03-06 08:27:37Z

The working hack is to add pm.sendRequest with the data from the second test to the "Tests" tab of the 1st test. In this case the 2d test does not run on the whole, but gifts are collected. It is not the best decision, but it works.

let jsonData = pm.response.json();

let giftsArray = [];

_.each(pm.response.json().gifts, (item) => {
    giftsArray.push(item.id);
});

pm.sendRequest({
    url: 'http://url/api/gifts/collect',
    method: 'POST',
    header: {
        'Content-type': 'application/json',
        'Host': 'url',
        'accept-encoding': 'gzip, deflate',
        'Connection': 'keep-alive'
    },
    body: {
        mode: 'raw',
        raw: JSON.stringify({'api_token': '48696295110ba1e8f9937820dc9b6626', 'user_id': '100650741100901', 'gift_ids': giftsArray, 'version': '6.0.0'})
    }
}, function (err, res) {
console.log(res);
});

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