In order to access the query string we should first require the url module. Doing so we will be able to invoke the method parse on the url module passing over req.url and true. The method parse returns an object that its properties are the parameters the query string includes.

var http = require('http');
var url = require('url') ;

http.createServer(function (req, res) {
  //var area = req.query.width * req.query.height;    
  res.writeHead(200, {'Content-Type': 'text/plain'});
  var queryObject = url.parse(req.url,true).query;
  res.end('area is '+(queryObject.width*queryObject.height));
}).listen(process.env.PORT);

The following video clip overviews this code sample, shows its execution and explains it.

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