proxy.js

const qrcode = require('qrcode-terminal');
const open = require('open');

// setup your httpServer as you like (express.js)
// ...

// The '0.0.0.0' binding is important here, otherwise the addresses will not work
httpsServer.listen(1337, '0.0.0.0', () => {
  for (const [_, addresses] of Object.entries(os.networkInterfaces())) {
    const relevantAddresses = addresses.filter((a) => !a.internal && a.family === 'IPv4').map((a) => a.address);
    if (!relevantAddresses.length) continue;

    console.log(`\n`);
    for (const address of relevantAddresses) {
      console.log(`\n* Also listening on: https://${address}:1337\n`);
      qrcode.generate(`https://${address}:1337`);
    }
    console.log(`\n`);
  }
  open('https://localhost:1337');
});