Interview Questions
Error Boundaries are React components that catch JavaScript errors in their child component tree and display fallback UI. They prevent the entire app from crashing and provide a way to gracefully handle runtime errors.
Create a class component that implements either getDerivedStateFromError() or componentDidCatch() lifecycle methods. getDerivedStateFromError() renders fallback UI, while componentDidCatch() handles error logging.
Error Boundaries don't catch errors in event handlers, asynchronous code (setTimeout/requestAnimationFrame), server-side rendering, or errors thrown in the error boundary itself. These require different error handling approaches.
Use try-catch blocks in event handlers, implement proper error handling and state updates, provide user feedback. Consider global error handling for uncaught errors in events.
Implement proper error logging services, collect relevant error context, handle different error types appropriately, maintain user privacy. Consider environment-specific logging strategies.
Use try-catch with async/await, implement proper error states, handle promise rejections, use error boundaries where applicable. Consider loading states and user feedback.
componentDidCatch captures error information and error stack traces. Used for error logging, analytics, and side effects in error handling. Cannot modify state during render phase.
Implement retry logic, state reset mechanisms, fallback UI, and proper error clearing. Consider user experience and recovery workflows.
Implement proper error status handling, retry mechanisms, offline detection, and user feedback. Consider caching strategies and fallback content.
Use try-catch in effects, implement error states, handle cleanup properly, consider custom hooks for error handling. Cannot use error boundaries directly in hooks.
Implement client-side validation, handle server validation errors, provide clear error messages, manage error states properly. Consider UX and accessibility.
Implement error reducers, handle async action errors, provide error states in store, consider middleware for error handling. Handle global vs local error states.
Place boundaries strategically to isolate failures, consider component hierarchy, implement granular error handling. Balance between too many and too few boundaries.
Use Error Boundaries with Suspense, handle loading errors, implement fallback UI, manage timeout scenarios. Consider data fetching errors.
Implement error handling logic in HOCs, wrap components with error boundaries, handle prop validation errors. Consider composition of error handling HOCs.
Use error boundaries around portals, handle portal-specific errors, manage cleanup on errors. Consider modal and overlay error scenarios.
Handle app bootstrap errors, implement fallback content, manage configuration errors, provide meaningful error messages. Consider recovery options.
Provide fallback functionality, implement feature detection, handle browser compatibility issues. Consider progressive enhancement approaches.
Implement route-level error boundaries, handle navigation errors, provide error pages, manage route transitions. Consider deep linking errors.
Implement SSR-specific error handling, manage hydration errors, handle state reconciliation issues. Consider client-server error differences.
Provide clear, actionable error messages, implement proper i18n, consider user experience, maintain consistency. Handle different error types appropriately.
Implement proper cleanup in useEffect, handle component unmounting, manage resource disposal. Consider async operation cancellation.
Implement field-level and form-level validation, handle async validation, provide immediate feedback. Consider UX and accessibility requirements.
Implement proper error states, handle network failures, manage retry logic, provide user feedback. Consider caching and offline scenarios.
Implement error tracking services, collect error metrics, analyze error patterns, set up alerts. Consider privacy and performance implications.
Wrap third-party components in error boundaries, handle integration errors, implement fallbacks. Consider version compatibility issues.
Handle session expiration, implement token refresh, manage unauthorized access, provide proper user feedback. Consider security implications.
Integrate error tracking services, collect relevant error data, implement proper error categorization. Consider privacy and compliance requirements.
Test error boundaries, simulate different error conditions, verify error recovery, implement comprehensive test cases. Consider edge cases and error combinations.