This function is meant to be used with an URL like the window.location

jquery.parseparams.js

// Add an URL parser to JQuery that returns an object
// This function is meant to be used with an URL like the window.location
// Use: $.parseParams('http://mysite.com/?var=string') or $.parseParams() to parse the window.location
// Simple variable:  ?var=abc                        returns {var: "abc"}
// Simple object:    ?var.length=2&var.scope=123     returns {var: {length: "2", scope: "123"}}
// Simple array:     ?var[]=0&var[]=9                returns {var: ["0", "9"]}
// Array with index: ?var[0]=0&var[1]=9              returns {var: ["0", "9"]}
// Nested objects:   ?my.var.is.here=5               returns {my: {var: {is: {here: "5"}}}}
// All together:     ?var=a&my.var[]=b&my.cookie=no  returns {var: "a", my: {var: ["b"], cookie: "no"}}
// You just cant have an object in an array, ?var[1].test=abc DOES NOT WORK
(function ($) {
    var re = /([^&=]+)=?([^&]*)/g;
    var decode = function (str) {
        return decodeURIComponent(str.replace(/\+/g, ' '));
    };
    $.parseParams = function (query) {
        // recursive function to construct the result object
        function createElement(params, key, value) {
            key = key + '';
            // if the key is a property
            if (key.indexOf('.') !== -1) {
                // extract the first part with the name of the object
                var list = key.split('.');
                // the rest of the key
                var new_key = key.split(/\.(.+)?/)[1];
                // create the object if it doesnt exist
                if (!params[list[0]]) params[list[0]] = {};
                // if the key is not empty, create it in the object
                if (new_key !== '') {
                    createElement(params[list[0]], new_key, value);
                } else console.warn('parseParams :: empty property in key "' + key + '"');
            } else
            // if the key is an array    
            if (key.indexOf('[') !== -1) {
                // extract the array name
                var list = key.split('[');
                key = list[0];
                // extract the index of the array
                var list = list[1].split(']');
                var index = list[0]
                // if index is empty, just push the value at the end of the array
                if (index == '') {
                    if (!params) params = {};
                    if (!params[key] || !$.isArray(params[key])) params[key] = [];
                    params[key].push(value);
                } else
                // add the value at the index (must be an integer)
                {
                    if (!params) params = {};
                    if (!params[key] || !$.isArray(params[key])) params[key] = [];
                    params[key][parseInt(index)] = value;
                }
            } else
            // just normal key
            {
                if (!params) params = {};
                params[key] = value;
            }
        }
        // be sure the query is a string
        query = query + '';
        if (query === '') query = window.location + '';
        var params = {}, e;
        if (query) {
            // remove # from end of query
            if (query.indexOf('#') !== -1) {
                query = query.substr(0, query.indexOf('#'));
            }

            // remove ? at the begining of the query
            if (query.indexOf('?') !== -1) {
                query = query.substr(query.indexOf('?') + 1, query.length);
            } else return {};
            // empty parameters
            if (query == '') return {};
            // execute a createElement on every key and value
            while (e = re.exec(query)) {
                var key = decode(e[1]);
                var value = decode(e[2]);
                createElement(params, key, value);
            }
        }
        return params;
    };
})(jQuery);