Why is building the backend first recommended?
Because you design the data model and APIs, then build the frontend against real endpoints. This avoids the disconnect of mock data that does not match the real API, which is a common bug source when you finally connect them.
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For learning, build the backend first so the frontend consumes real APIs. If you are stronger on the frontend, build it first with mock data, then design the backend's data shape to match. Either works, but match shapes carefully.
A shape mismatch when you connect the real backend. Your parsing and rendering may break if the mock shape differs from the real API. If you mock, copy a real backend response shape so they match.
Build the data model and a few core APIs first, then alternate between frontend and backend, refining each as you learn what the UI needs. This balances real data with iterative UI work.
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