Error Handling Interview Questions
Comprehensive error handling interview questions and answers for Angular. Prepare for your next job interview with expert guidance.
Questions Overview
1. What is the global error handling mechanism in Angular?
Basic2. How do you handle HTTP errors in Angular?
Moderate3. What are error boundaries in Angular?
Advanced4. How do you implement form validation error handling?
Moderate5. What are RxJS error handling operators?
Advanced6. How do you implement error logging services?
Moderate7. What are the best practices for error handling?
Moderate8. How do you handle async operation errors?
Moderate9. What are error notification strategies?
Basic10. How do you handle route navigation errors?
Moderate11. What are error recovery patterns?
Advanced12. How do you implement error tracking?
Moderate13. What are error prevention strategies?
Moderate14. How do you handle memory leaks?
Advanced15. What are error monitoring tools?
Moderate16. How do you handle third-party library errors?
Advanced17. What are error testing strategies?
Moderate18. How do you handle production errors?
Advanced19. What are error serialization strategies?
Moderate20. How do you handle offline errors?
Advanced21. What are error boundary patterns?
Advanced22. How do you handle state management errors?
Advanced23. What are error handling anti-patterns?
Moderate24. How do you handle initialization errors?
Advanced25. What are error reporting best practices?
Moderate26. How do you handle security-related errors?
Advanced27. What are error documentation practices?
Moderate28. How do you handle performance-related errors?
Advanced29. What are error handling metrics?
Moderate30. How do you handle dependency injection errors?
Advanced1. What is the global error handling mechanism in Angular?
BasicGlobal error handling through ErrorHandler class. Override handleError method for custom handling. Catches all unhandled errors. Implement logging, user notification, error reporting.
2. How do you handle HTTP errors in Angular?
ModerateHTTP errors handled through interceptors, catchError operator. Implement retry logic, error transformation. Use error handling services. Consider different error types, user feedback.
3. What are error boundaries in Angular?
AdvancedError boundaries through component error handlers, ngOnError hook. Catch and handle rendering errors. Implement fallback UI, error recovery. Consider component hierarchy.
4. How do you implement form validation error handling?
ModerateForm errors through validators, error states. Display validation messages, highlight errors. Implement custom validators, async validation. Consider user experience, feedback timing.
5. What are RxJS error handling operators?
AdvancedRxJS operators: catchError, retry, retryWhen, throwError. Handle stream errors, implement recovery logic. Consider error transformation, retry strategies.
6. How do you implement error logging services?
ModerateError logging through centralized service. Log error details, stack traces. Implement remote logging, error tracking. Consider privacy, performance impact.
7. What are the best practices for error handling?
ModerateBest practices: centralized handling, proper error types, user feedback. Implement logging, monitoring. Consider error recovery, graceful degradation.
8. How do you handle async operation errors?
ModerateAsync errors through Promise catch, Observable error handling. Implement proper error propagation, recovery. Consider loading states, timeout handling.
9. What are error notification strategies?
BasicError notifications through toasts, alerts, error pages. Implement user-friendly messages, action options. Consider error severity, context-appropriate feedback.
10. How do you handle route navigation errors?
ModerateNavigation errors through Router error events, guards. Implement redirection, error pages. Consider route parameters, navigation history.
11. What are error recovery patterns?
AdvancedRecovery patterns: retry logic, fallback options, graceful degradation. Implement automatic recovery, manual intervention. Consider user experience, data integrity.
12. How do you implement error tracking?
ModerateError tracking through monitoring services, custom tracking. Implement error aggregation, analysis. Consider error patterns, impact assessment.
13. What are error prevention strategies?
ModeratePrevention strategies: input validation, type checking, defensive programming. Implement proper error boundaries, testing. Consider edge cases, error scenarios.
14. How do you handle memory leaks?
AdvancedMemory leak prevention through proper unsubscription, cleanup. Implement resource management, leak detection. Consider component lifecycle, subscription handling.
15. What are error monitoring tools?
ModerateMonitoring tools: Sentry, LogRocket, custom solutions. Implement error tracking, performance monitoring. Consider tool integration, configuration.
16. How do you handle third-party library errors?
AdvancedLibrary errors through error wrapping, custom handlers. Implement proper integration, error transformation. Consider library updates, compatibility issues.
17. What are error testing strategies?
ModerateError testing through unit tests, integration tests. Test error scenarios, recovery logic. Consider error simulation, boundary testing.
18. How do you handle production errors?
AdvancedProduction errors through logging, monitoring, alerts. Implement error reporting, analysis. Consider environment differences, security implications.
19. What are error serialization strategies?
ModerateError serialization for logging, transmission. Implement proper error format, data extraction. Consider sensitive information, error context.
20. How do you handle offline errors?
AdvancedOffline errors through connection checking, retry logic. Implement offline storage, sync mechanisms. Consider network conditions, data persistence.
21. What are error boundary patterns?
AdvancedBoundary patterns: component-level, route-level, app-level boundaries. Implement proper error isolation, recovery. Consider error propagation, UI feedback.
22. How do you handle state management errors?
AdvancedState errors through error actions, error states. Implement state recovery, rollback mechanisms. Consider state consistency, error propagation.
23. What are error handling anti-patterns?
ModerateAnti-patterns: swallowing errors, generic error messages, missing logging. Avoid broad catch blocks, silent failures. Consider proper error handling practices.
24. How do you handle initialization errors?
AdvancedInitialization errors through APP_INITIALIZER, bootstrap handling. Implement proper startup checks, fallbacks. Consider application requirements, dependencies.
25. What are error reporting best practices?
ModerateReporting practices: proper error format, context inclusion, aggregation. Implement error categorization, priority handling. Consider privacy, compliance requirements.
26. How do you handle security-related errors?
AdvancedSecurity errors through proper validation, authorization checks. Implement secure error messages, logging. Consider sensitive information, attack vectors.
27. What are error documentation practices?
ModerateDocumentation practices: error codes, handling procedures, recovery steps. Implement proper error guides, troubleshooting docs. Consider user/developer documentation.
28. How do you handle performance-related errors?
AdvancedPerformance errors through monitoring, optimization. Implement performance boundaries, error tracking. Consider resource usage, user experience impact.
29. What are error handling metrics?
ModerateError metrics: error rates, recovery times, impact assessment. Implement metric collection, analysis. Consider monitoring, alerting thresholds.
30. How do you handle dependency injection errors?
AdvancedDI errors through proper provider configuration, error catching. Implement fallback providers, error messages. Consider circular dependencies, missing providers.