hello world of express framework

hello_express.js

var express = require("express");
var server = express.createServer();
                                                                                                                                                              
server.get('/', function(req, res) {
  console.log(req);
  console.log(res);
 res.send("hello express"); 
});

server.get('/users/:id', function(req, res) {
  res.send(req.params.id); 
});

server.listen(8000);