Getting a diff of two json-objects

Question

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.

Answer 1

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;
};