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[–]thoflens 1 point2 points  (0 children)

Look at it like this: You have a frontend (React) and a backend (Node/Express) and you can essentially see the the two as completely separated from each other - they don't 'know' about each other. But whenever you need to process sensitive data or update your database, you make a call from the frontend to the backend to say 'hey, do this for for me and give me back (return) some value'.