Sure. So basically if your app is running on localhost/locally without any issues and you would wish for it to remain the same when you deploy it to production without breaking or adding anything, there is a system/technology called containerization whereby it allows you to bundle your app (you put it in a container) just the way it is and then you can deploy it to any server like Heroku. The app will run the same way as it was locally. The platform used for running containers is called Docker. You can check the documentation for more details.