How do I connect React to live backend data?
Set the API URL in environment variables, use fetch or axios with centralized API calls, attach the auth token with an axios interceptor, handle loading, error, and success states, guard against unmount with a cleanup flag or AbortController, and read the response shape carefully.
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More FAQs in How to Connect a React Frontend to Live Backend Data
So the API surface is easy to find, change, and mock in tests. Scattering fetch calls across components makes changes hard and mocks harder. A central api folder keeps the integration organized.
Use an axios interceptor that adds the Authorization header automatically to every request. The interceptor reads the token from wherever you store it and attaches it, so you do not repeat the header on every call.
Because if a component unmounts while a fetch is in flight, setting state on it warns. Use a cleanup flag in useEffect or an AbortController to cancel the request on unmount, preventing leaks and warnings.
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