Save JSON value as another JSON file

Question

I have a JSON file like below:

{
  "soils": [{
    "mukey": "658854",
    "mukeyName": "Meggett-Kenansville-Garcon-Eunola-Blanton-Bigbee (s1517)",
    "sl_source": "Fl soil map",
    "cokey": "3035468",
    "soilName": "Eunola",
    "comppct_r": 20,
    "compArea": "9.96",
  }],
  "asfirs": [{
    "long": -82.96896600817682,
    "lat": 29.977675992923395
  }],
  "polygon": [{
    "rings": [
      [
        [-9235836.910744485,
          3501136.0564117758
        ],
        [-9235798.692230342,
          3500237.921329426
        ],
        [-9236553.507884657,
          3500667.87961353
        ],
        [-9235836.910744485,
          3501136.0564117758
        ]
      ]
    ],
    "spatialReference": {
      "wkid": 102100,
      "latestWkid": 3857
    }
  }]
}

I want extract the value of Polygon key to another JSON object like below

{
  "rings": [
    [
      [-9161396.799823288,
        3453315.140590871
      ],
      [-9160708.866568722,
        3453095.3841345515
      ],
      [-9161349.02668061,
        3452751.4175072685
      ],
      [-9161396.799823288,
        3453315.140590871
      ]
    ]
  ],
  "spatialReference": {
    "wkid": 102100,
    "latestWkid": 3857
  }
}

Now when I do it using

var key3 = 'polygon';
var newPolygonJSON = polygonJson[key3];
var text = JSON.stringify(newPolygonJSON);

where polgonJson contains my initial JSON file I get an extra [] bracket which is not allowing me to create a proper JSON file, like below.

 [{
   "rings": [
     [
       [-9235836.910744485,
         3501136.0564117758
       ],
       [-9235798.692230342,
         3500237.921329426
       ],
       [-9236553.507884657,
         3500667.87961353
       ],
       [-9235836.910744485,
         3501136.0564117758
       ]
     ]
   ],
   "spatialReference": {
     "wkid": 102100,
     "latestWkid": 3857
   }
 }]

How can I get rid of those [] brackets or extract the value properly?

@str. It is wrong. Variable text is of type string, so text[0] === '['. — user6586783
– user6586783, Commented Aug 24, 2016 at 15:28

score 1 · Accepted Answer · 2016-08-24 15:27:08Z

1

When you stringify JSON object, it puts extra [] brackets because it takes your object as an array. To extract JSON from text variable, you need to get value of the first (and only) element in that array.

var key3 = 'polygon';
var newPolygonJSON = polygonJson[key3];
var text = JSON.stringify(newPolygonJSON[0]);

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