so-secrety.js

const {SecretManagerServiceClient} = require('@google-cloud/secret-manager');
const client = new SecretManagerServiceClient();

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

let secret;
async function getSecret() {
  if (!secret) {
    const [version] = await client.accessSecretVersion({
      name: process.env.SECRET
    });
    secret = version.payload.data.toString('utf8') || 'Master';
  }
  return secret;
}

app.get('/', async (req, res) => {
  console.log('Hello world received a request.');
  const secret = await getSecret();
  res.send(`Hail ${secret}!`);
});

const port = process.env.PORT || 8080;
app.listen(port, () => {
  console.log('Hello world listening on port', port);
});