object to query string and query string to object conversation

Object.toQueryString.js

    /**
     * Convert Object to URL query string
     *
     * Usage:
     *  var object = {param1:123,param2:'something',param3:'another',param4:null,param5:'',bla:{param10:'I am nested!',array2:[20,'test',40.56],ja:{param6:'really_nested'}},test_array:[10,'foobar',30.5]};
     *  var query = object.toQueryString();
     * Result: "param1=123&param2=something&param3=another&param4&param5=&bla[param10]=I%20am%20nested!&bla[array2][]=20&bla[array2][]=test&bla[array2][]=40.56&bla[ja][param6]=really_nested&test_array[]=10&test_array[]=foobar&test_array[]=30.5"
     *
     * @version 1.0
     *
     * @param Array keys only for recursion!!!
     * @param Array queryParts only for recursion!!!
     * @return string
     */
    Object.prototype.toQueryString = function(keys, queryParts) {
    	keys = keys || [];
    	queryParts = queryParts || [];

		for ( var prop in this) {
			if (!this.hasOwnProperty(prop)) {
	            continue;
	        }
    		var temp = keys.slice(0);
    		var value = this[prop];
    		var temp_keys = keys.slice(0);
			temp_keys.push(prop);
    		temp_keys.forEach(function(value, index, array) {
    			array[index] = index === 0 ? value : '['+value+']';
    		});
    		if (value instanceof Array) {
        		value.forEach(function(v, k, a){
            		queryParts.push( temp_keys.join('') + '[]' + (v === null ? '' : '=' + encodeURIComponent(v) ));
        		});
    		} else if (value instanceof Object) {
        		value.toQueryString(temp_keys, queryParts);
    		} else {
        		queryParts.push( temp_keys.join('') + (value === null ? '' : '=' + encodeURIComponent(value) ));
    		}
		}
    	return queryParts.join('&');
    }

String.toObject.js

    /**
     * String convert to Object
     * 
     * @return Object
     */
    String.prototype.toObject = function(){
    	var out = {};
    	var parts = this.indexOf('&') !== -1 ? this.split('&') : this.split('&');
    	parts.forEach(function(value, index, array) {
    		value = value.split('=');
    		if (value.length === 1) {
    			value[1] = null;
    		}
    		var keys_str = value[0];
    		if (keys_str == '') {
    			return;
    		}
    		value = value[1];
    		// Convert to boolean or number if possible:
    		if (['true', 'false'].indexOf(value) > -1) {
    			value = value === 'true'
    		} else if (parseFloat(value) !== NaN && parseFloat(value) == value) {
    			value = parseFloat(value);
    		}
    		var keys = keys_str.replace(/^([^\[]+)/, '[$1]').slice(1, -1).split('][');
    		var temp_out = out;
    		keys.forEach(function(k, i, a){
    			if (i === a.length - 1) {
        			temp_out[k] = value;
    			} else {
    				if (i < a.length - 1 && a[i+1] === '') {
            			temp_out[k] = temp_out[k] instanceof Array ? temp_out[k] : [];
            			temp_out[k].push(value);
    				} else {
            			temp_out[k] = temp_out[k] instanceof Object ? temp_out[k] : {};
    				}
        			temp_out = temp_out[k];
    			}
    		});
    	});
    	return out;
    };

test.js

var test = {
	    param1: 123,
	    param2: 'something',
	    param3: 'another',
	    param4: null,
	    param5: '',
	    param6: true,
	    param7: false,
	    bla: {
	        param10: 'I am nested!',
	        array2: [20, 'test', 40.56],
	        ja: {
	            param6: 'really_n=ested'
	        }
	    },
	    test_array: [10,'foobar',30.5]
	};



var test_value = test.toQueryString()
console.log(test_value);

console.log(test_value.toObject());