# Access React Router's loader data from a route ErrorBoundary

Used: react-router@7.0.0

If you want to access a route loader data inside an ErrorBoundary, you can use the `useRouteLoaderData` hook, this hook will return the loader data or undefined in case the loader failed or the route doesn't match the current URL.

```ts {% path="app/root.tsx" %}
import { useRouteLoaderData } from "react-router";

export function ErrorBoundary() {
  let data = useRouteLoaderData<typeof loader>(routeId);
  // code
}
```

You will need to get the `routeId` from the route you want to access, which for the `app/root.tsx` file is just `root` and for any other route is the file without the extension, so for `app/routes/_.posts.tsx` the routeId is `routes/_.posts` and for `app/routes/_.posts_.$postId/route.tsx` the routeId is `routes/_.posts_.$postId`.

Also Remember to always check if data exists since it's possible it may not be there.