Error boundaries prevent entire app crashes from component errors. Here's how to implement them effectively.
Basic Error Boundary#
Loading code block...
Resettable Error Boundary#
Loading code block...
react-error-boundary Library#
Loading code block...
Strategic Boundary Placement#
Loading code block...
Error Logging#
Loading code block...
Async Error Handling#
Loading code block...
Development vs Production#
Loading code block...
Best Practices#
Placement:
✓ App-level for global errors
✓ Page-level for route isolation
✓ Widget-level for independent failures
✓ Don't wrap every component
Recovery:
✓ Provide reset mechanism
✓ Use resetKeys for automatic reset
✓ Offer navigation options
✓ Log errors for debugging
UX:
✓ Show user-friendly messages
✓ Provide actionable recovery steps
✓ Maintain partial functionality
✓ Different fallbacks for severity
Testing:
✓ Test error scenarios
✓ Verify boundary catches errors
✓ Test reset functionality
✓ Test fallback rendering
Conclusion#
Error boundaries prevent cascading failures in React apps. Place them strategically at app, page, and widget levels. Use resettable boundaries for recovery, log errors for debugging, and provide helpful fallback UIs. Remember that error boundaries don't catch async errors - handle those with try-catch and state or hooks.