Error boundaries catch JavaScript errors in components and display fallback UI. Here's how to use them effectively.
Basic Error Boundary#
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Error Boundary with Reset#
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react-error-boundary Library#
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Granular Error Boundaries#
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Error Boundary with Retry#
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Suspense with Error Boundary#
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Error Reporting Integration#
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Error Types and Handling#
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Testing Error Boundaries#
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Best Practices#
Placement:
✓ Wrap major sections independently
✓ Place near data fetching components
✓ Keep user-interactive areas recoverable
✓ Don't wrap everything in one boundary
Recovery:
✓ Provide clear error messages
✓ Offer retry or reset options
✓ Clear relevant cache on reset
✓ Log errors for debugging
UX:
✓ Match fallback UI to component style
✓ Preserve surrounding layout
✓ Show actionable recovery steps
✓ Consider automatic retry for network errors
Conclusion#
Error boundaries prevent entire app crashes from component errors. Place them strategically around major sections, provide clear recovery options, and integrate with error reporting services. Use the react-error-boundary library for hooks support and advanced features.