How One Developer Fixed Triple Error Handling in a Supabase Login Flow

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A developer building a personal project with Supabase authentication discovered the same login error was being caught and rethrown across three separate layers — a service, a provider, and a form. The redundancy stemmed from copy-paste habits and AI autocomplete suggestions, leading to duplicate error messages appearing in the UI. To resolve this, the developer defined a clear Detect-Store-Display contract, assigning each layer a single responsibility: the service detects failures, the provider stores the error message in state, and the UI renders it. The refactored approach uses one consistent error signaling method — throwing rather than mixing throws with result objects — and removes duplicate catch blocks from the form layer. The fix highlights how even routine code like login pages can accumulate structural debt when error ownership is never explicitly defined.

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