Pushing data to JSON object javascript

Question

I want to push this object to a JSON array

var obj =  {'x':21,'y':32,'z':43};

Since my JSON key:value comes dynamically , I cant access using keys , so i used the loop method .

var str = {xA : []}; //declared a JSON array

for (var key in obj) {

    alert(' name=' + key + ' value=' + obj[key]);

     str.xA.push({
         key :   obj[key]
     })
}

When i alert the values I am getting the keys and values properly, but when I am pushing it to the array my key is always coming as 'key' instead of the actual key like x, y,z as in the code.

Any help is appreciated.

Answer 1

The literal notation does not allow expressions for keys. You need to create the object first and then use the bracket notation instead:

var tmp = {};
tmp[key] = obj[key];
str.xA.push(tmp);

Answer 2

You need to use [] notation, otherwise always the key name will be key and not the value of the key.

 str.xA.push({
     key :   obj[key]
 })

to

   var tmp= {};
   tmp[key] = obj[key]
   str.xA.push(tmp)