JavaScript programming logic with JSON

Question

I have a JSON object as below:

{"_id":"594fe31b3e158c0e70c9bb3e","deviceid":"342","alldata":"{\"deviceid\":\"342\",\"voltage\":\"14\",\"current\":\"9\",\"power\":\"92\",\"status\":\"1\"}","receivedon":"2017/06/25 21:51:47","__v":0}

The issue is that, when I try to output obj.alldata.voltage, it just gives blank; which leads me to think that obj.alldata is a string and not a JSON object.

When I print obj.alldata, it gives an output like:

{"deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}

How can I use obj.receivedon, as well as obj.alldata.voltage, correctly?

You should use the parse() function in JS, and the data becomes a JavaScript object. — Dawid Karasiewicz
– Dawid Karasiewicz, Commented Jun 25, 2017 at 17:22
"which leads me to think that obj.alldata is a string and not a JSON object" exactly. There is no such thing as a JSON object. You have to understand with what types you are dealing. You either have an object, or a string (wich may or may not contain JSON). And you can only access the properties on the object, not on the string. — Thomas
– Thomas, Commented Jun 25, 2017 at 17:46

Rodris · Accepted Answer · 2017-06-25 17:36:04Z

1

Remove the quotes of the alldata value, so it won't be treated as string.

{ "_id": "594fe31b3e158c0e70c9bb3e", "deviceid": "342", "alldata": { "deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}, "receivedon": "2017/ 06 / 25 21: 51:47", "__v": 0 };

answered Jun 25, 2017 at 17:36

Rodris

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gurpreet singh · Accepted Answer · 2017-06-25 17:59:16Z

data = {
        "_id": "594fe31b3e158c0e70c9bb3e",
        "deviceid": "342",
        "alldata": {\"deviceid\":\"342\",\"voltage\":\"14\",\"current\":\"9\",\"power\":\"92\",\"status\":\"1\"}",
        "receivedon": "2017/06/25 21:51:47",
        "__v": 0
       }

The above is a hash or a js object except the value for key "alldata" is a json, you need to parse that json

data.alldata = JSON.parse(data.alldata)

After this your object will look like this

     { _id: "594fe31b3e158c0e70c9bb3e", 
       deviceid: "342", : 
       alldata: {
          deviceid: "342",
          voltage: "14",
          current: "9",
          power: "92",
          status: "1"
      }, 
     receivedon: "2017/06/25 21:51:47", __v: 0
    }

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