Production-Ready Error Boundaries in React: Patterns for Graceful Failures

Production-Ready Error Boundaries in React: Patterns for Graceful Failures Unhandled render errors crash your entire React tree. Error boundaries contain the damage. Here's how to use them effectively in production. The Problem // If UserCard throws, the entire page goes blank function Dashboard() { return ( <div> <Header /> <UserCard /> {/* if this throws, everything dies */} <Analytics /> </div> ) } Basic Error Boundary Error boundaries must be class components (for now): import React, { Component, ReactNode } from 'react' interface Props { children: ReactNode fallback?: ReactNode } interface State { hasError: boolean error: Error | null } class ErrorBoundary extends Component<Props, State> { state: State = { hasError: false, error: null } static getDerivedStateFromError(error: Error): State { return { hasError: true, error } } componentDidCatch(error: Error, info: React.ErrorInfo) { console.error('ErrorBoundary caught:', error, info.componentStack