How to Host a Node.js Application on Vertra Cloud

my-project/
├── src/
│   └── index.js
├── package.json
└── vertracloud.config  (optional)

{
  "name": "my-project",
  "version": "1.0.0",
  "main": "src/index.js",
  "scripts": {
    "start": "node src/index.js"
  },
  "dependencies": {
  }
}

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

const http = require('http');

const port = process.env.PORT || 80;

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify({ message: 'Hello from Vertra Cloud!' }));
});

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