Error Handling Patterns

# Error Handling Patterns

## Frontend Error Handling
- Use Error Boundaries
- Implement global error handler
- Log errors to service
- Show user-friendly messages

## Backend Error Handling
- Create custom error classes
- Use middleware for errors
- Return consistent error format
- Log errors appropriately

## API Error Responses
- Use proper HTTP status codes
- Include error codes
- Provide helpful messages
- Don't expose internals

## Best Practices
- Fail fast, fail loudly
- Log stack traces
- Implement retry logic
- Monitor error rates