Serialize Form to JSON

.js

(function ($) {
	$.fn.serializeFormJSON = function (options) {

		options = jQuery.extend({}, options);

		var self = this,
			json = {},
			push_counters = {},
			patterns = {
				"validate": /^[a-zA-Z][a-zA-Z0-9_]*(?:\[(?:\d*|[a-zA-Z0-9_]+)\])*$/,
				"key":      /[a-zA-Z0-9_]+|(?=\[\])/g,
				"push":     /^$/,
				"fixed":    /^\d+$/,
				"named":    /^[a-zA-Z0-9_]+$/
			};


		this.build = function(base, key, value){
			base[key] = value;
			return base;
		};

		this.push_counter = function(key){
			if(push_counters[key] === undefined){
				push_counters[key] = 0;
			}
			return push_counters[key]++;
		};

		jQuery.each(jQuery(this).serializeArray(), function(){

			// skip invalid keys
			if(!patterns.validate.test(this.name)){
				return;
			}

			var k,
				keys = this.name.match(patterns.key),
				merge = this.value,
				reverse_key = this.name;

			while((k = keys.pop()) !== undefined){

				// adjust reverse_key
				reverse_key = reverse_key.replace(new RegExp("\\[" + k + "\\]$"), '');

				// push
				if(k.match(patterns.push)){
					merge = self.build([], self.push_counter(reverse_key), merge);
				}

				// fixed
				else if(k.match(patterns.fixed)){
					merge = self.build([], k, merge);
				}

				// named
				else if(k.match(patterns.named)){
					merge = self.build({}, k, merge);
				}
			}

			json = jQuery.extend(true, json, merge);
		});


		return json;

	};
})(jQuery);