This is originated as https://github.com/pg0408/lorem-ipsum-demo specifically: https://www.freecodecamp.org/news/how-to-deploy-your-site-using-express-and-heroku/
npm install node server.js
-- or to avoid rerunning server.js a lot --
add to package.json "scripts": { "start": "node server.js" }, -- and use nodemon ...node monitor --
npm install nodemon --save-dev npm run start