server.js

const dotenv = require('dotenv');
const mongoose = require('mongoose');

process.on('uncaughtException', (err) => {
  console.log(err.name, err.message);
  console.log(err);
  console.log('Uncaught exception 💥. Shuting down...');
  process.exit(1);
});

dotenv.config({ path: './config.env' });

const app = require('./app.js');

const DB = process.env.DATABASE.replace(
  '<password>',
  process.env.DATABASE_PASSWORD
);

mongoose
  .connect(DB)
  .then(() => console.log('Database Connected Successfully'))
  .catch((err) => console.log(err));

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

const server = app.listen(port, () => {
  console.log(`App running on port ${port}`);
});

process.on('unhandledRejection', (err) => {
  console.log(err.name, err.message);
  console.log('Unhandled rejection 💥. Shuting down...');
  // close server after asynchronous requests
  server.close(() => {
    process.exit(1);
  });
});