Error Boundaries

Error Boundaries — Are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of the component tree that crashed.

class ErrorBoundary extends React.Component {
  constructor(props) {
    this.state = { hasError: false };

  static getDerivedStateFromError(error) {
    // Update state so the next render will show the fallback UI.
    return { hasError: true };

  componentDidCatch(error, info) {
    // You can also log the error to an error reporting service
    logErrorToMyService(error, info);

  render() {
    if (this.state.hasError) {
      // You can render any custom fallback UI
      return <h1>Something went wrong.</h1>;

    return this.props.children; 
  <MyWidget />

Work like a JavaScript catch {} block, but for components.

Related concepts

Error Boundaries

Error Boundaries — Structure map

Clickable & Draggable!

Error Boundaries — Related pages: