Error Handling Interview Questions

Error types include: Network errors, GraphQL errors, Runtime errors. Network errors for connection issues, GraphQL errors for operation failures, Runtime errors for execution problems. Each requires specific handling strategies.

Global error handling through error link, onError callback. Implement centralized error processing, logging. Features: error transformation, retry logic. Handle application-wide errors.

Error policies control how errors affect result data. Options: none, all, ignore. Determine partial data handling, error inclusion. Configure per-operation behavior.

Network error handling through retry logic, fallback strategies. Implement timeout handling, offline detection. Features: connection recovery, user feedback. Manage connectivity issues.

Error tracking through logging services, monitoring tools. Implement error reporting, analytics collection. Features: error patterns, performance impact. Monitor application health.

Mutation error handling through try-catch blocks, error callbacks. Handle operation failures, optimistic updates. Features: rollback logic, error recovery. Manage mutation failures.

Error links provide custom error handling middleware. Intercept and process errors, modify error behavior. Features: error transformation, retry logic. Extend error handling capabilities.

Partial error handling through error policies, data extraction. Process partial responses, handle missing data. Features: graceful degradation, fallback content. Manage incomplete results.

Error UI through error boundaries, component feedback. Display error messages, recovery options. Features: user communication, action guidance. Improve error experience.

Retry logic through retry link, attempt configuration. Implement exponential backoff, max attempts. Features: retry conditions, timeout handling. Manage operation retries.

Error transformations through custom error processing, formatting. Modify error structure, add context. Features: error normalization, message formatting. Standardize error handling.

Subscription error handling through connection monitoring, error callbacks. Handle WebSocket errors, connection failures. Features: reconnection logic, state recovery. Manage subscription issues.

Error boundaries catch rendering errors, provide fallback UI. Implement component-level error handling. Features: error isolation, recovery options. Prevent application crashes.

Error logging through centralized service, structured formats. Implement error categorization, context capture. Features: log aggregation, analysis tools. Track application errors.

Recovery strategies through fallback options, state reset. Implement data recovery, cache updates. Features: graceful degradation, user feedback. Handle error recovery.