Add or change a value of JSON key with jquery or javascript

Question

I have a JSON string(?) that I have returned from $.ajax() and named it data. Some of the values are empty and I need to

Answer 1

Once you have decoded the JSON, the result is a JavaScript object. Just manipulate it as you would any other object. For example:

data.busNum = 12345;
...

Answer 2

It seems if your key is saved in a variable. data.key = value won't work.

You should use data[key] = value

Example:

data = {key1:'v1', key2:'v2'};

var mykey = 'key1'; 
data.mykey = 'newv1';
data[mykey] = 'newV2';

console.log(data);

Result:

{
  "key1": "newV2",
  "key2": "v2",
  "mykey": "newv1"
}

Answer 3

Just like you would for any other variable, you just set it

alert(data.ID);
data.ID = "bar";  //dot notation 
alert(data.ID);    
data.userID = 123456;
data["address"] = "123 some street"; //bracket notation

Answer 4

var temp = data.oldKey; // or data['oldKey']
data.newKey = temp;
delete data.oldKey;

Answer 5

data.userID = "10";

Answer 6

var y_axis_name=[];

 for(var point in jsonData[0].data)
              { 
                y_axis_name.push(point);

              }

y_axis_name is having all the key name

try on jsfiddle