How do you share validation and types between frontend and backend?
Model answer
Define schemas once with a library such as Zod in a shared package or folder and use them on both sides, with TypeScript types inferred from them. The backend must still validate every request, and the frontend uses the same rules for fast feedback.
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useEffect and Fetching Data from Your API: Loading, Errors and Cleanup in the course MERN Stack Full Course: MongoDB, Express, React and Node.js.
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