What I assume is that you are in wrong directory and running different file if there is no log? In that case:

In linux you can navigate to it using:

$ cd Backend

Your terminal line should start with something like:

user@FinGenius Finance-Assistant/Backend $

And when you are sure that you are in right directory you can run server with

$ node server.js

If this is not the case you should provide more information.

Does it close instantly when you run it or server stays open? Maybe run it with only console.log("foo"); inside?