Deploy React project with backend

I built a Translator project using React. I used API for translation functionality.
I run npm run start:frontend to run the frontend.
And I run npm run start:backend to run the backend.

Screen Shot 2022-04-22 at 9.33.16 PM

The project is working fine in localhost. But I don’t know how to post the project on the Internet because I want also to run the backend when I deploy the project, but I don’t know how!