Error boundaries catch JavaScript errors in component trees. Here's how to use them effectively.
Basic Error Boundary#
Loading code block...
Error Boundary with Reset#
Loading code block...
Reset on Props Change#
Loading code block...
Multiple Boundaries#
Loading code block...
Error Reporting#
Loading code block...
Error Fallback Components#
Loading code block...
What Errors Are Caught#
Loading code block...
Hook for Error Handling#
Loading code block...
react-error-boundary Library#
Loading code block...
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.