Serialize form to JSON

gistfile1.js

(function( $ ){
    $.fn.serializeObject=function() {
    var json = {};
    jQuery.map($(this).serializeArray(), function(n, i){
        json[n['name']] = n['value'];
    });
    return json;
    };
})( jQuery );

or 

$.fn.serializeObject = function()
{
    var o = {};
    var a = this.serializeArray();
    $.each(a, function() {
        if (o[this.name] !== undefined) {
            if (!o[this.name].push) {
                o[this.name] = [o[this.name]];
            }
            o[this.name].push(this.value || '');
        } else {
            o[this.name] = this.value || '';
        }
    });
    return o;
};