Error boundaries prevent entire app crashes from component errors. Here's how to implement them effectively.
Basic Error Boundary
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Resettable Error Boundary
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react-error-boundary Library
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Strategic Boundary Placement
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Error Logging
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Async Error Handling
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Development vs Production
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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.