What are error boundaries in React?

What are error boundaries in React?

Error boundaries are React components that catch JavaScript errors in their child component tree, log those errors, and display a fallback UI.

How do I implement an error boundary?

You can implement an error boundary by creating a class component that defines either static getDerivedStateFromError() or componentDidCatch() methods.

Can error boundaries catch errors in asynchronous code?

No, error boundaries only catch errors in the render phase, lifecycle methods, and constructors of the whole tree below them.

What happens if an error boundary itself throws an error?

If an error boundary throws an error, it will not catch its own errors. You should wrap it in another error boundary.