There are many plugins for deserializing form data in json format, however there is a profound lack of plugins for turning native objects in javascript into serialized JSON objects. There is a plugin at json.org but frankly , it stinks- memory leaks in IE and its 3 times as long as the equivalent code here which doesn't even use any jquery helpers for serializing.11

jQuery.box=function(obj) {
	var ret="";
	if (typeof(obj)!='object') {
		return typeof(obj)=='string'?"'"+obj+"'":new String(obj);
	} else if ((typeof(obj)!='function')&&(obj!=null)) {
		try {
		var o=obj.constructor==Object?'{':'[';
		var c=o=='{'?'}':']';
		var kvs=[];
		if (o=='{')
			for (i in obj) {
				kvs.push("'"+i+"':"+$.box(obj[i]));
			}
		 else
			for (i=0;i<obj.length;kvs.push($.box(obj[i++])));
		} catch(e) {
			return "{'error':'"+e.message.replace(/'/g,"`")+"'}";
		}
		return o+kvs.join(',')+c;
	} else {
		return 'null';
	}
};

Feel free to modify / improve upon this code and repost as you with, note that I originally came up with it though.