Express Routes & XHR with Public API


I have some GET routes returning JSON information from theMovieDB public API, but I have no clue how to get this information from the backend to HTML.

I think XHR might help, but would someone be able to give me the 20,000 foot view version of what needs to happen to get backend information to the frontend?

Then explain how to get XHR to facilitate that?

Thank you,