How to convert json to java script array?

You can do like this

JsFiddler Demo of below code

var JSONObject = {"results":[{"Name":"Pini","ID":"111"},
                  {"Name":"Yaniv","ID":"123"},
                             {"Name":"Yoni","ID":"145"}]};


var Users= [];

$.each(JSONObject.results, function(i, obj)
       {
    alert(obj.Name);
    alert(obj.ID);
    Users.push([obj.Name, obj.ID]);
});​

I think something like this:

var ret = [];

for (var i = 0; i < js.length; i++) {
    ret.push([js[i].Name, js[i].ID]);
}

// ret holds your array of arrays

Or something like:

var ret = $.map(js, function (el, i) {
    return [[el.Name, el.ID]];
});

An example of both: http://jsfiddle.net/RNY8M/

For this kind of transformations I always prefer using UnderscoreJs which is an utility-belt library (mainly for object/array transformations) for Javascript. I think that it provides great functions that make life easier, allowing javascript developers to be more productive and to achieve a better legibility for the resulting code.

Here is the solution with underscore (extended):

var js=[{"Name":"Pini","ID":"111"},  
        {"Name":"Yaniv","ID":"123"},    
        {"Name":"Yoni","ID":"145"}]

var names = _.pluck(js, 'Name');
var ids = _.pluck(js, 'ID');

var result = _.zip(names, ids)

And you achive the desired result:

[['Pini',111],['Yaniv',123],['Yoni',145]]

Solution in one line with underscorejs:

var result = _.zip(_.pluck(js, 'Name'), _.pluck(js, 'ID'))

Hope it helps!

The proposed solution is not general-purpose, and it can't be reused without modifying it (e.g. if the JSON array has different key names, or if it's nested).

I would suggest:

   var jsonString= '[{"Name":"Pini","ID":"111"}, {"Name":"Yaniv","ID":"123"}, {"Name":"Yoni","ID":"145"}]';

   var jsArray = JSON.parse( jsonString );

Reference: http://www.json.org/js.html.

Here's a solution that will work for a simple object (not deep objects, though.... but I'll leave that for you to implement).

http://jsfiddle.net/eUtkC/

var js = [{
    "Name": "Pini",
    "ID": "111"},
{
    "Name": "Yaniv",
    "ID": "123"},
{
    "Name": "Yoni",
    "ID": "145"}]

function obj2arr(obj) {
    var i, key, length = obj.length,
        aOutput = [],
        aObjValues;
    for (i = length - 1; i >= 0; i--) {
        aObjValues = [];
        for (key in obj[i]) {
            if (obj[i].hasOwnProperty(key)) {
                aObjValues.push(obj[i][key]);
            }
        }
        aOutput.push(aObjValues);
    }
    return aOutput;
}

document.write(JSON.stringify(obj2arr(js)))​

EDIT

Here's a version using Array.prototype.map:

http://jsfiddle.net/eUtkC/1/

function obj2arr(obj) {
    var key, aOutput = [];
    for (key in obj) {
        if (obj.hasOwnProperty(key)) {
            aOutput.push(obj[key]);
        }
    }
    return aOutput;
}

document.write(JSON.stringify(js.map(obj2arr)))​