Custom queryparam parser

serialisedQueryParser.js

var http = require('http');
var qs = require('querystring');

function parseSerialisedQueryParam(request, paramName, delimiter) {
    delimiter = delimiter || ',';
    var url   = request.url;
    var rawQuery = require('url').parse(url).query;
    var parsedQuery = qs.parse(rawQuery, null, null, {
        decodeURIComponent: function(param) {
            return param;
        }
    });

    console.log(typeof parsedQuery[paramName])
    // console.log(parsedQuery[paramName].join(delimiter));
    return (paramName in parsedQuery) ?
            parsedQuery[paramName].split(delimiter).map(function decodeItem(item) {
                return decodeURIComponent(item);
            }) :
            null;
}

http.createServer(function(request, response) {
  var headers = request.headers;
  var method = request.method;
  var parsedQueryParam = parseSerialisedQueryParam(request, 'b');

  response.end(JSON.stringify(parsedQueryParam));

}).listen(8080); // Activates this server, listening on port 8080.