Error boundaries catch JavaScript errors in component trees. Here's how to use them effectively.
Basic Error Boundary
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Error Boundary with Reset
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Reset on Props Change
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Multiple Boundaries
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Error Reporting
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Error Fallback Components
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What Errors Are Caught
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Hook for Error Handling
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react-error-boundary Library
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Best Practices
Placement:
✓ Wrap route components
✓ Isolate independent widgets
✓ Keep boundaries granular
✓ Have a top-level catch-all
Recovery:
✓ Provide reset functionality
✓ Reset on key prop changes
✓ Clear error state properly
✓ Show helpful messages
Reporting:
✓ Log to error service
✓ Include component stack
✓ Add user context
✓ Track error frequency
Avoid:
✗ Catching everything silently
✗ Showing technical errors to users
✗ Error boundaries in event handlers
✗ Forgetting async error handling
Conclusion
Error boundaries prevent crashes from taking down entire apps. Use multiple boundaries to isolate failures, provide reset functionality for recovery, and report errors for debugging. Remember they only catch render errors—handle event and async errors separately.