When something goes wrong inside a load function, SvelteKit renders an error page.

The default error page is somewhat bland. We can customize it by creating a src/routes/+error.svelte component:

<script>
	import { page } from '$app/stores';
	import { emojis } from './emojis.js';
</script>

<h1>{$page.status} {$page.error.message}</h1>
<span style="font-size: 10em">
	{emojis[$page.status] ?? emojis[500]}
</span>

Notice that the +error.svelte component is rendered inside the root +layout.svelte. We can create more granular +error.svelte boundaries:

<h1>this error was expected</h1>

This component will be rendered for /expected, while the root src/routes/+error.svelte page will be rendered for any other errors that occur.