Getting a diff of two json

Scenario: I want a function that compares two JSON-objects, and returns a JSON-object with a list of the differences and if possible more data such as coverage metrics.

var madrid = '{"type":"team","description":"Good","trophies":[{"ucl":"10"}, {"copa":"5"}]}';
var barca = '{"type":"team","description":"Bad","trophies":[{"ucl":"3"}]}';

If i ran compare(madrid, barca) the returned object could look something like:

{"description" : "Bad", "trophies":[{"ucl":"3"}, {"copa":"5"}]}; 

Or something similar, you get the idea.

Does anyone know of a solution to this? I've already found one plugin, but I'd like to know if there are any alternatives.

---

This is just a kickoff, I haven't test it, but I begun with a filter or comparator function, that is recursive, change it however you need to get priority results.

function filter(obj1, obj2) {
    var result = {};
    for(key in obj1) {
        if(obj2[key] != obj1[key]) result[key] = obj2[key];
        if(typeof obj2[key] == 'array' && typeof obj1[key] == 'array') 
            result[key] = arguments.callee(obj1[key], obj2[key]);
        if(typeof obj2[key] == 'object' && typeof obj1[key] == 'object') 
            result[key] = arguments.callee(obj1[key], obj2[key]);
    }
    return result;
}

Tests: http://jsfiddle.net/gartz/Q3BtG/2/

---

You can use rus-diff https://github.com/mirek/node-rus-diff which creates MongoDB compatible (rename/unset/set) diff:

// npm install rus-diff
var madrid = {"type":"team","description":"Good","trophies":[{"ucl":"10"}, {"copa":"5"}]};
var barca = {"type":"team","description":"Bad","trophies":[{"ucl":"3"}]};
var rusDiff = require('rus-diff').rusDiff
console.log(rusDiff(madrid, barca))

Outputs:

{ '$unset': { 'trophies.1': true },
  '$set': { description: 'Bad', 'trophies.0.ucl': '3' } }

---

contributing back my changes to Gabriel Gartz version. This one works in strict mode and removes the array check - will always be false. It also removes empty nodes from the diff.

                //http://stackoverflow.com/questions/679915/how-do-i-test-for-an-empty-javascript-object
                var isEmptyObject = function(obj) {
                    var name;
                    for (name in obj) {
                        return false;
                    }
                    return true;
                };

                //http://stackoverflow.com/questions/8431651/getting-a-diff-of-two-json-objects
                var diff = function(obj1, obj2) {
                    var result = {};
                    var change;
                    for (var key in obj1) {
                        if (typeof obj2[key] == 'object' && typeof obj1[key] == 'object') {
                            change = diff(obj1[key], obj2[key]);
                            if (isEmptyObject(change) === false) {
                                result[key] = change;
                            }
                        }
                        else if (obj2[key] != obj1[key]) {
                            result[key] = obj2[key];
                        }
                    }
                    return result;
                };

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