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Content collections give you a type-safe way to work with structured content in Aero. Define a schema, query items at build time with getCollection(), and render Markdown with render(). Aero validates frontmatter against your schema and hot-reloads when content changes.

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Define a collection

Declare collections in content.config.ts at the project root:
content.config.ts
import { defineCollection, defineConfig } from '@aero-js/content'
import { z } from 'zod'

export const docs = defineCollection({
	name: 'docs',
	directory: 'client/content/docs',
	schema: z.object({
		title: z.string(),
		date: z.date(),
	}),
})
The content API uses Standard Schema, so you can use Zod, ArkType, Valibot, or any spec-compliant validator.

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Query a collection

Use getCollection() inside a <script is:build> block to fetch all items:
client/pages/docs/index.html
<script is:build>
	import { getCollection } from 'aero:content'

	const allDocs = await getCollection('docs')
	allDocs.sort((a, b) => b.data.date.valueOf() - a.data.date.valueOf())
</script>

<ul>
	<li data-for="{ const doc of allDocs }">
		<a href="/docs/{ doc.id }">{ doc.data.title }</a>
	</li>
</ul>
Each item has an id (derived from the filename) and a data object with validated frontmatter fields.

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Render Markdown

Call render() to convert a collection item’s Markdown body to HTML:
client/pages/docs/[slug].html
<script is:build>
	import { getCollection, render } from 'aero:content'

	export async function getStaticPaths() {
		const docs = await getCollection('docs')
		return docs.map(doc => ({
			params: { slug: doc.id },
			props: doc,
		}))
	}

	const doc = Aero.props
	const { html } = await render(doc)
</script>

<h1>{ doc.data.title }</h1>
<article>{ html }</article>

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Single-file Markdown import

For simple cases where you need to import a single Markdown file without defining a full collection, Aero supports direct Markdown imports in build scripts. See the content collections guide for details.
In development, edits to Markdown files or content.config.ts trigger a hot update so Vite refreshes importers without a full page reload.