Simple ExpressJS server, Graceful shutdown, medium

simple-express-app.js

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

const app = express();
app.use(express.urlencoded({extended: true})); 
app.use(express.json());

mongoose.connect('mongodb://localhost/test', (err) => {
  if (err) throw err;
  console.log('Mongoose connected!');
});
const User = mongoose.model('User', { name: String });

app.post('/user', async (req, res) => {
  try {
    const user = new User({ name: req.body.username });
    await user.save();
    res.send('Success!').status(201);
  } catch (err) {
    res.send(err.message).status(500);
  }
});

app.listen(3000, () => console.log('Example app listening on port 3000!'));