extract the key identifier from the JSON reply

My JSON ResponseData example for form0 is provided below:

{
    "MaterialType": "camera",
    "AssetID": 202773,
    "forms": [
        {
            "release": "asyncCmd/accessCameraMulti",
            "action": "rest/Asset/202773/cameraAccessMultiple",
            "fields": [
                {
                    "fieldName": "cameras",
                    "fieldType": "json",
                    "jsonSchema": "rest/schemas/camera",
                    "instanceIds": {
                        "12202773.2.0": [
                            "MJPEG:MPEG4",
                            "FLV:H264",
                            "RTSP:H264"
                        ]
                    }
                }
            ],

I am looking to extract the key name "12202773.2.0" from instanceIds and assign it to a variable.

Currently, 

jsonData.forms[0].fields[0].instanceIds
is returning the values instead of the key name.

javascriptjsonpostman

Answer №1

Experiment

Retrieve the keys from jsonData.forms[0].fields[0].instanceIds by using Object.keys()

You will receive an array of keys for instanceIds. To access the first key, you can simply refer to it using [0].

Answer №2

Utilizing its build-in feature, Postman incorporates Lodash, allowing you to take advantage of the _.keys() function, which essentially performs the same task as Object.keys.

_.keys(jsonData.forms[0].fields[0].instanceIds)

Answer №3

Take a look at 

Object.keys(jsonData.forms[0].fields[0].instanceIds)
.

This will provide you with the list of names 122.

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