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# error-boundaries Definition **Definition:** Add `+error.svelte` to render a custom error page for errors thrown during `load`/rendering in the corresponding route subtree. **Syntax:** `src/routes/+error.svelte`, or nested `.../route/+error.svelte` **Notes:** - SvelteKit walks up to the nearest `+error.svelte` if a child doesn’t exist. - Errors in `+server` handlers and `handle` do not use `+error.svelte`; they return JSON or fallback error page. - For 404s with no matched route, root `+error.svelte` is used. ## Example ```svelte <script lang="ts"> import { page } from '$app/state'; </script> <h1>{page.status}: {page.error.message}</h1> ``` ## Related - `advanced-routing`, `hooks.server.handleError`