GoDaddy - Handle HTTP requests (Get and post)

I have Shared Hosting with CPanel. I am making a project, but right now my credentials to FTP and databases and email and stuff are in there. I would like to hide it behind a REST API where the app can send a post/get request to a server so the server can accomplish a task without the risk of someone decoding the program code and seeing my credentials. This is similar to a NodeJS Express app, or a NodeJS HTTP app. Could anyone help me with this? Thank you!