jQuery serialize form in JSON

serializeJSON

String.prototype.endsWith = function(suffix) {
        return this.indexOf(suffix, this.length - suffix.length) !== -1;
    };

    //JSON
    $.fn.serializeJSON = function () {
        var json = {};
        jQuery.map($(this).serializeArray(), function (n, i) {
            if(n['name'].endsWith('[]')){
                if(json[n['name']] === undefined)
                    json[n['name']] = [];
                json[n['name']].push(n['value']);
            }
            else
                json[n['name']] = n['value'];
        });
        return json;
    };