Only in class components

• If a component throws an error during rendering, React will crash the whole UI tree.
• Rely on class lifecycle methods that hooks do not have access to.

Hooks Don’t Have Error Boundaries

• Error boundaries rely on render phase lifecycle
• Hooks run after render
• React needs class lifecycle control for error recovery

Error Boundaries do:

• Catch errors during render
• Catch errors in lifecycle methods
• Catch errors in constructors of child components
• Show a fallback UI
• Prevent app from fully crashing

❌ NOT caught:

• Event handlers (onClick)
• Async code (setTimeout, fetch)
• Server-side rendering