Express Hello World

server.js

var express = require('express'),
  app = express(),
  port = process.env.PORT || 3000;

var listener = app.listen(port, () => {
    console.info("==> ✅  Server is listening");
    console.info("==> 🌎  Go to localhost:%s", port);
});

app.route('/')
    .get((req, res) => {
        res.send('Hello World!');
    });