Simple Node.js/Express app

app.js

var express = require('express')
var app = express()

// respond with "Hello World!" on the homepage
app.get('/', function (req, res) {
  res.send('<h1>Hello JavaScript!</h1>');
});
// accept POST request on the homepage
app.post('/', function (req, res) {
  res.send('Got a POST request</h1>');
});
// accept GET request at /user
app.get('/user', function (req, res) {
  res.send('<h1>Hello John Doe!</h1>');
});
// accept PUT request at /user
app.put('/user', function (req, res) {
  res.send('Got a PUT request at /user');
});
// accept DELETE request at /user
app.delete('/user', function (req, res) {
  res.send('Got a DELETE request at /user');
});

var server = app.listen(3000, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});

/*
var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {
    "Content-Type" : "text/html"
  });
  res.end("<h1>Hello JavaScript!</h1>");
}).listen(8000);
console.log("Server running at http://127.0.0.1:8000/");
*/