#remix

Implement robust error handling in Remix. Patterns: 1. Route-level ErrorBoundary for unexpected errors. 2. useRouteError hook to access error details. 3. CatchBoundary for thrown responses (404, 401). 4. Nested error boundaries for granular recovery. 5. Custom error pages with helpful messages. 6. Error logging to external service. 7. Fallback UI with retry button. 8. Development vs production error display. Use loader error throwers for validation failures and graceful degradation.