Web Reference: If React encounters an error in a lifecycle method, the render() method or in the constructor of a component, the Error Boundary can safely prevent it. It can display a fallback that can prompt the user to restart their application or inform them that something has gone wrong. To solve this problem for React users, React 16 introduces a new concept of an “error boundary”. 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. Oct 6, 2025 · If an error occurs within a component’s rendering process or lifecycle methods, React looks for the nearest error boundary in the component tree. The error boundary captures the error and renders a fallback UI, preventing the error from propagating and crashing the whole application.
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