Entry Point for Sample NodeJS App for Deployment

index.js

const express = require('express');
const bodyParser = require('body-parser');
const helmet = require('helmet');
const compression = require('compression');

const app = express();

app.use(bodyParser.urlencoded({extended: true}));
app.use(express.static('public'));

let todoList = ["Buy Eggs"];

app.post('/add', (req, res) => {
  const todoItem = req.body.todo;
  todoList.push(todoItem);
  res.json({success: true});
});

app.get('/list', (_, res) => {
  res.json(todoList);
});

app.use((req, res, next) => {
  res.status(404).send('404: Page not found');
});

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('500: Internal server error');
});

app.use(helmet());
app.use(compression());

const port = process.env.PORT || 3000;

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