You can add a
Procfile to the root of your project directory.
It allows to customize the command that will be used to start your app.
web: node index.js
Procfiles can contain additional process types. For example, you might declare one for a background worker process that processes items off of a queue.
You can choose to enable the Cloudflare option so your app traffic goes through their network.
It provides a faster delivery and caching of your static assets and Denial-of-Service attack protection.
Due to the aggresive caching, your static file might not reflect changes right after you deploy a new version. You can disable this option while developing to make sure you can see your changes.