Question

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Convert Javascript Array to JSON

I am trying to figure out how to return an array and store it in json variable as string, is that possible? [If not, how can I return all the outputs and store it json?] – If you know what I mean…

    //arr = ["a", "b", "c", "d", "ddd"]
    //largest = 3
    var generateEntryCodes = function(arr, largest) {
        var newText = ""
        for(var i=0; i < arr.length; i++) {
            if (arr[i] == null) {
                arr.splice(i, 1);
                i--;
            }
            var counts = arr[i].length != largest ? (parseInt(largest) - parseInt(arr[i].length)) : 0
            for (var z=0; z<counts;z++)
                newText += "0"
            var result = arr[i].splice( 0, 0, newText )
            newText = ""
            result = [{
                "result": result, 
                "total": result.length
            }]
        }
        return result
    }

I am try to output the above code as:

00a
00b
00c
00d
ddd

But as I flash the result json. I only get “ddd”… So I tried adding before the result = [{}] jSON code:

$("textarea").val( $("textarea").val("") + result + "\n")
//outputs:
   00a
   00b
   00c
   00d
   ddd

How can I get all the outputs from result variable and store it in JSON variable.

Problem: Code only store into JSON the last array.

Answer 1

Generally speaking you can simply construct your JavaScript object and then serialize it to JSON like in the example below:

var myArray = ['a','b','c'];
var jsonString = JSON.stringify(myArray);

That should work. Note that you might have to include JSON2.js in case your browser doesn’t support it natively.

//Edit:
That should work: http://jsbin.com/welcome/31083/edit

Here’s the code:

var generateEntryCodes = function(arr, largest) {
        var newText = "",
            codes = [],
            currentElement,
            result;


        for(var i=0; i < arr.length; i++) {
          currentElement = arr[i];

          var zerosToPrepend = largest - currentElement.length;
          for (var z = 0; z < zerosToPrepend; z++){
                newText += "0"
          }

          currentElement = newText + currentElement;
          codes.push(currentElement);    

          newText = ""
        }

      result = {
        codes: codes,
        total: codes.length
      };

        return result
    }


var result = generateEntryCodes(["a", "b", "c", "d", "ddd"], 3);
console.log(result);

This should return a JavaScript object that looks as follows:

{"codes": ["00a", "00b", "00c", "00d", "ddd"], "total": 5}

You can then take that result and use JSON.stringify(...) to convert it into a JSON string.