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Advanced reactivity
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<script module>
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Basic SvelteKit
Introduction
Routing
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Advanced SvelteKit
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Advanced SvelteKit Advanced routing Rest parameters

To match an unknown number of path segments, use a [...rest] parameter, so named for its resemblance to rest parameters in JavaScript.

Rename src/routes/[path] to src/routes/[...path]. The route now matches any path.

Other, more specific routes will be tested first, making rest parameters useful as ‘catch-all’ routes. For example, if you needed a custom 404 page for pages inside /categories/..., you could add these files:

src/routes/
├ categories/
│ ├ animal/
│ ├ mineral/
│ ├ vegetable/
│ ├ [...catchall]/
│ │ ├ +error.svelte
│ │ └ +page.server.js

Inside the +page.server.js file, error(404) inside load.

Rest parameters do not need to go at the end — a route like /items/[...path]/edit or /items/[...path].json is totally valid.

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Optional parameters
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<script>
	import { page } from '$app/stores';
 
	let words = ['how', 'deep', 'does', 'the', 'rabbit', 'hole', 'go'];
 
	let depth = $derived($page.params.path.split('/').filter(Boolean).length);
	let next = $derived(depth === words.length ? '/' : `/${words.slice(0, depth + 1).join('/')}`);
</script>
 
<div class="flex">
	{#each words.slice(0, depth) as word}
		<p>{word}</p>
	{/each}
 
	<p><a href={next}>{words[depth] ?? '?'}</a></p>
</div>
 
<style>
	.flex {
		display: flex;
		height: 100%;
		flex-direction: column;
		align-items: center;
		justify-content: center;
	}
 
	p {
		margin: 0.5rem 0;
		line-height: 1;
	}
 
	a {
		display: flex;
		width: 100%;
		height: 100%;
		align-items: center;
		justify-content: center;
		font-size: 4rem;
	}
</style>