app.js

//app.js
var config = require('./config.json');
var express = require('express');
var app = express();

app.use(express.static('public'));

app.get('/', function (request, response) {
  response.send('Hello, World!');
});

app.get('/greet/:name', function (request, response) {
  var name = request.params.name;
  response.json({ message: "Hello, " + name });
});

var users = [];
app.get('/create/users/:username', function (req, res) {
  var username = req.params.username;

  if (users.indexOf(username) < 0) {
    users.push(username);
  }

  var index = users.indexOf(username);

  res.json({id: index, username: username});
})

app.get('/users', function(req, res) {
  res.json(users);
})

app.get('/add/:x/:y', function (request, response) {
  var x = request.params.x;
  var y = request.params.y;

  response.json({ answer: x + y });
})

var server = app.listen(config.port, displayServerInfo);

function displayServerInfo () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Listening at http://%s:%s', host, port);
}

server-structure.md

Project Structure

public/
    css/
    js/
    index.html
.gitignore
app.js

// add to `app.js`
// reference: http://expressjs.com/starter/static-files.html
app.use(express.static('public'));