Adding data to JSON array

Question

I have a JSON Array inside my Node.js code with the following schema:

{
    "status": "ok",
    "data": [
        {
            "id": 1,
            "active": true,
            "createdAt": "2017-07-21T15:39:31.000Z",
            "updatedAt": "2017-07-21T15:47:13.000Z"
        }
     ]
 }

and I want to add data so it will look like:

{
    "status": "ok",
    "data": [
        {
            "id": 1,
            "active": true,
            "createdAt": "2017-07-21T15:39:31.000Z",
            "updatedAt": "2017-07-21T15:47:13.000Z",
            "information": "someInformation"
        }
     ]
 }

Can you help me how to do this?

Thanks!

sauntimo · Accepted Answer · 2017-07-21 16:01:51Z

3

Like this? access the data property, of the obj variable, and the first element in that array, then set a new property on that object equal to your string.

var obj = {
    "status": "ok",
    "data": [
        {
            "id": 1,
            "active": true,
            "createdAt": "2017-07-21T15:39:31.000Z",
            "updatedAt": "2017-07-21T15:47:13.000Z"
        }
     ]
 };
 
 obj.data[0].information = "someInformation";
 
 console.log( obj );

answered Jul 21, 2017 at 16:01

sauntimo

1,6012 gold badges20 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Martin Joiner Over a year ago

The original question asked for JSON (which is a string) to be modified. This answer modifies an object.

sauntimo Over a year ago

@MartinJoiner well, if need be, OP can get the object back to JSON with JSON.stringify( obj );

Sergey · Accepted Answer · 2017-07-21 16:06:41Z

Since you have already the JSON you should firstly parse it, because JSON is a string. After parsing you will get object that should be saved in some variable, then you can access it as general object and add the property you want. Then you have to transform it to JSON string again. It will be like this

var parsed = JSON.parse(data); // Now we are transforming JSON string into the object

//Now you may do whatever you want
parsed.newprop = 'some text';
parsed.hello = 'Hellow world';

data = JSON.stringify(parsed); // Now we are replacing the previous version of JSON string to new version with additional properties

This answers the question better as it specifically asked for JSON to be modified but the accepted answer modifies a JavaScript object.

Saurabh Yadav · Accepted Answer · 2017-07-21 16:07:26Z

0

var dataContainer = {
     "status": "ok",
     "data": [
      {
        "id": 1,
        "active": true,
        "createdAt": "2017-07-21T15:39:31.000Z",
        "updatedAt": "2017-07-21T15:47:13.000Z"
      }
   ]
};


for(var i = 0; i < dataContainer.data.length; i++) {
  dataContainer['data'][i]['information'] = "some information";
}

Hope it helps you !

answered Jul 21, 2017 at 16:07

Saurabh Yadav

3,3861 gold badge12 silver badges21 bronze badges

Collectives™ on Stack Overflow

Adding data to JSON array

3 Answers 3

2 Comments

1 Comment

Comments

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

1 Comment

Comments

Related