How to rewrite a project in React?

Question

JavaScript

Good afternoon. Please tell me how can I rewrite the interaction with the backend in react. Right now the front is html/css/js. Pages are sent by the server as you go to the route, let's say "/" - "Main", etc. Should I stick with this or are there other options? The application is multi-page, the deadlines are tight, I want to remove the copy-paste and make everything more compact. Is it possible to put all the files in the folder with routes after building the build? Thank you.