How to Host an Express.js API on Vertra Cloud

my-api/
├── src/
│   ├── index.js
│   ├── routes/
│   │   └── users.js
│   └── middleware/
│       └── auth.js
├── package.json
└── vertracloud.config

{
  "name": "my-api",
  "version": "1.0.0",
  "main": "src/index.js",
  "scripts": {
    "start": "node src/index.js"
  },
  "dependencies": {
    "express": "^4.18.0",
    "cors": "^2.8.5",
    "dotenv": "^16.3.0"
  }
}

MAIN=src/index.js
START=npm start
VERSION=recommended

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

const app = express();
const port = process.env.PORT || 80;

app.use(cors());
app.use(express.json());

app.get('/', (req, res) => {
  res.json({ message: 'API online on Vertra Cloud' });
});

app.get('/health', (req, res) => {
  res.json({ status: 'healthy', uptime: process.uptime() });
});

app.get('/api/users', (req, res) => {
  res.json({ users: [] });
});

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

app.listen(port, '0.0.0.0', () => {
  console.log(`API running on port ${port}`);
});

const fs = require('fs');
const { Pool } = require('pg');

const pool = new Pool({
  host: process.env.DB_HOST,
  port: Number(process.env.DB_PORT), // unique per database, copy it from the dashboard
  user: 'postgres',
  password: process.env.DB_PASSWORD,
  database: 'postgres',
  ssl: {
    ca: fs.readFileSync('certificate.pem'),
    cert: fs.readFileSync('certificate.crt'),
    key: fs.readFileSync('certificate.key'),
    rejectUnauthorized: true,
  },
});