index.js

import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';

/*
 Get environment variables.
 */
const PORT = process.env.PORT || 3000;
const NODE_ENV = process.env.NODE_ENV || "development";

/*
 Setup application.
 */
const app = express();
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// setup routes
app.use(express.urlencoded({extended: true}));
app.use(express.json()) // To parse the incoming requests with JSON payloads
app.use("/", express.static(path.join(__dirname, 'public')));


// catch any undefined routes
app.all('*', (request, response) => {
  console.log('Returning a 404 from the catch-all route');
  return response.sendStatus(404);
});

// start application
app.use((req, res, next) => {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});

app.use((req, res) => {
  res.send('Welcome to Express');
});

app.listen(PORT, () => {
  console.log(`Server running on port ${ PORT }`)
});