It's a CommonJS function that checks if two JS Objects are the same, checks nested objects as well

deepCompare.js

/**
 * Designed to work only if the object is an output of JSON.parse(obj)
 * So Only allowed datatypes for value are: number, string, boolean, object and null
 */
"use strict";
function deepCompare(obj1, obj2) {
    var leftChain, rightChain;
    function compare2Objects(x, y) {
        if (isNaN(x) && isNaN(y) && typeof x === 'number' && typeof y === 'number')
            return true;
        if (x === y)
            return true;
        if (!(x instanceof Object && y instanceof Object))
            return false;
        if (x.isPrototypeOf(y) || y.isPrototypeOf(x))
            return false;
        if (x.constructor !== y.constructor)
            return false;
        if (x.prototype !== y.prototype)
            return false;
        if (leftChain.indexOf(x) > -1 || rightChain.indexOf(y) > -1)
            return false;
        for (var p in y) {
            if (y.hasOwnProperty(p) !== x.hasOwnProperty(p))
                return false;
            else if (typeof y[p] !== typeof x[p])
                return false;
        }
        for (var p in x) {
            if (y.hasOwnProperty(p) !== x.hasOwnProperty(p))
                return false;
            else if (typeof y[p] !== typeof x[p])
                return false;
            switch (typeof x[p]) {
                case 'object':
                    leftChain.push(x);
                    rightChain.push(y);
                    if (!compare2Objects(x[p], y[p]))
                        return false;
                    leftChain.pop();
                    rightChain.pop();
                    break;
                default:
                    if (x[p] !== y[p])
                        return false;
                    break;
            }
        }
        return true;
    }
    return compare2Objects(obj1, obj2);
}