Error Boundaries

Error boundaries in React are the components that catch errors that may occur anywhere in the child components and then log the error and display a fallback UI and prevents the whole component tree from crashing. Error boundaries catch errors during component rendering in lifecycle methods. Only a class component can become an error boundary. A component becomes an error boundary if it defines either (or both) of the lifecycle methods static getDerivedStateFromError() or componentDidCatch().  static getDerivedStateFromError() is used to render a fallback UI after an error has been thrown.  componentDidCatch() is used to log error information.

Example

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

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

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

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

    return this.props.children; 
  }
}

This error boundary can be declared once and used through the app as a regular component.

<ErrorBoundary>
  <MyComponent />
</ErrorBoundary>