'Heroku Client and Server ReactJS deploy

I didn't find any good answer to my problem here on how to deploy a ReactJS App to Heroku when I have to different folders (client and server) that both need a npm start so that my Website works. Structure of folders is as below:

enter image description here

Can anyone give me a clear way how to solve this?



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source