This is an example about working with REACTJS and EXPRESSJS for FrontEnd and Backend, also this example uses MongoDB Atlas as storage.
This was made from this tutorial https://www.youtube.com/watch?v=7CqJlxBYj-M&list=PLxAVpVMmase83QV-yvAlsNrMYII7HIKQv&index=6 with small changes.