if (!Object.prototype.toJSONString) {

    Array.prototype.toJSONString = function () {
        var a = [],
            i,
            l = this.length,
            v;
        for (i = 0; i < l; i += 1) {
            v = this[i];
            switch (typeof v) {
            case 'object':
               if (v) {
                    if (typeof v.toJSONString === 'function') {
                        a.push(v.toJSONString());
                    }
                } else {
                    a.push('null');
                }
                break;

            case 'string':
            case 'number':
            case 'boolean':
                a.push(v.toJSONString());
            }
        }

        return '[' + a.join(',') + ']';
    };

    Boolean.prototype.toJSONString = function () {
        return String(this);
    };

    Date.prototype.toJSONString = function () {
        function f(n) {
            return n < 10 ? '0' + n : n;
        }
        return '"' + this.getFullYear() + '-' +
                f(this.getMonth() + 1) + '-' +
                f(this.getDate()) + 'T' +
                f(this.getHours()) + ':' +
                f(this.getMinutes()) + ':' +
                f(this.getSeconds()) + '"';
    };
    Number.prototype.toJSONString = function () {
        return isFinite(this) ? String(this) : 'null';
    };

    Object.prototype.toJSONString = function () {
        var a = [],
            k,
            v;
        for (k in this) {
            if (this.hasOwnProperty(k)) {
                v = this[k];
                switch (typeof v) {
                case 'object':
                    if (v) {
                        if (typeof v.toJSONString === 'function') {
                            a.push(k.toJSONString() + ':' + v.toJSONString());
                        }
                    } else {
                        a.push(k.toJSONString() + ':null');
                    }
                    break;

                case 'string':
                case 'number':
                case 'boolean':
                    a.push(k.toJSONString() + ':' + v.toJSONString());
                }
            }
        }
       return '{' + a.join(',') + '}';
    };
    (function (s) {
        var m = {
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        };
        s.parseJSON = function (filter) {
            var j;
            function walk(k, v) {
                var i;
                if (v && typeof v === 'object') {
                    for (i in v) {
                        if (v.hasOwnProperty(i)) {
                            v[i] = walk(i, v[i]);
                        }
                    }
                }
                return filter(k, v);
            }
           if (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/.test(this.
                    replace(/\\./g, '@').
                    replace(/"[^"\\\n\r]*"/g, ''))) {
               j = eval('(' + this + ')');
                if (typeof filter === 'function') {
                    j = walk('', j);
                }
                return j;
            }
            throw new SyntaxError('parseJSON');
        };
        s.toJSONString = function () {
           if (/["\\\x00-\x1f]/.test(this)) {
                return '"' + this.replace(/([\x00-\x1f\\"])/g, function (a, b) {
                    var c = m[b];
                    if (c) {
                        return c;
                    }
                    c = b.charCodeAt();
                    return '\\u00' +
                        Math.floor(c / 16).toString(16) +
                        (c % 16).toString(16);
                }) + '"';
            }
            return '"' + this + '"';
        };
    })(String.prototype);
}