Fetching the user-agent string from a request using either NodeJS or NodeJS + Express

node-user-agent.js

/** Native NodeJS */
var http = require('http')
  , server = http.createServer(function(req) {
        console.log(req.headers['user-agent']);
    });

server.listen(3000, 'localhost');

/** NodeJS with Express */
var express = require('express')
  , http = require('http')
  , app = express();

http.createServer(app).listen(3000);

app.get('/', function(req, res) {
    console.log(req.get('user-agent'));
});