estevg/react-error-boundary

Simple reusable React error boundary component

react-error-boundary

Reusable React error boundary component. Supports all React renderers (including React DOM and React Native).

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Getting started

# npm
npm install react-error-boundary

# yarn
yarn add react-error-boundary

API

ErrorBoundary component

Wrap an ErrorBoundary around other React components to "catch" errors and render a fallback UI. The component supports several ways to render a fallback (shown below).

ErrorBoundary with fallback prop

The simplest way to render a default "something went wrong" type error message.

import { ErrorBoundary } from "react-error-boundary";

<ErrorBoundary fallback={<div>Something went wrong</div>}>
  <ExampleApplication />
</ErrorBoundary>

ErrorBoundary with fallbackRender prop

"Render prop" function responsible for returning a fallback UI based on a thrown value.

import { ErrorBoundary } from "react-error-boundary";

function fallbackRender({ error, resetErrorBoundary }) {
  // Call resetErrorBoundary() to reset the error boundary and retry the render.

  return (
    <div role="alert">
      <p>Something went wrong:</p>
      <pre style={{ color: "red" }}>{error.message}</pre>
    </div>
  );
}

<ErrorBoundary
  fallbackRender={fallbackRender}
  onReset={(details) => {
    // Reset the state of your app so the error doesn't happen again
  }}
>
  <ExampleApplication />
</ErrorBoundary>;

ErrorBoundary with FallbackComponent prop

React component responsible for returning a fallback UI based on a thrown value.

import { ErrorBoundary } from "react-error-boundary";

function Fallback({ error, resetErrorBoundary }) {
  // Call resetErrorBoundary() to reset the error boundary and retry the render.

  return (
    <div role="alert">
      <p>Something went wrong:</p>
      <pre style={{ color: "red" }}>{error.message}</pre>
    </div>
  );
}

<ErrorBoundary
  FallbackComponent={Fallback}
  onReset={(details) => {
    // Reset the state of your app so the error doesn't happen again
  }}
>
  <ExampleApplication />
</ErrorBoundary>;

Logging errors with onError

import { ErrorBoundary } from "react-error-boundary";

const logError = (error: Error, info: { componentStack: string }) => {
  // Do something with the error, e.g. log to an external API
};

const ui = (
  <ErrorBoundary FallbackComponent={ErrorFallback} onError={logError}>
    <ExampleApplication />
  </ErrorBoundary>
);

useErrorBoundary hook

Convenience hook for imperatively showing or dismissing error boundaries.

Show the nearest error boundary from an event handler

React only handles errors thrown during render or during component lifecycle methods (e.g. effects and did-mount/did-update). Errors thrown in event handlers, or after async code has run, will not be caught.

This hook can be used to pass those errors to the nearest error boundary:

import { useErrorBoundary } from "react-error-boundary";

function Example() {
  const { showBoundary } = useErrorBoundary();

  useEffect(() => {
    fetchGreeting(name).then(
      response => {
        // Set data in state and re-render
      },
      error => {
        // Show error boundary
        showBoundary(error);
      }
    );
  });

  // Render ...
}

Dismiss the nearest error boundary

A fallback component can use this hook to request the nearest error boundary retry the render that original failed.

import { useErrorBoundary } from "react-error-boundary";

function ErrorFallback({ error }) {
  const { resetBoundary } = useErrorBoundary();

  return (
    <div role="alert">
      <p>Something went wrong:</p>
      <pre style={{ color: "red" }}>{error.message}</pre>
      <button onClick={resetBoundary}>Try again</button>
    </div>
  );
}

withErrorBoundary HOC

This package can also be used as a higher-order component that accepts all of the same props as above:

import {withErrorBoundary} from 'react-error-boundary'

const ComponentWithErrorBoundary = withErrorBoundary(ExampleComponent, {
  fallback: <div>Something went wrong</div>,
  onError(error, info) {
    // Do something with the error
    // E.g. log to an error logging client here
  },
})

// Can be rendered as <ComponentWithErrorBoundary {...props} />

---

This blog post shows more examples of how this package can be used, although it was written for the version 3 API.