Typed collections

Preserve and validate custom frontmatter for product-specific content types.

Foldocs validates the standard page fields and preserves every additional frontmatter key under frontmatter.data.

---
title: Authentication
product: identity
stability: stable
owners:
  - platform
---

Define a collection

import { defineCollection, parseCollectionFrontmatter } from '@foldocs/content'

const guides = defineCollection({
  name: 'guides',
  directory: 'content/guides',
  parse: value => GuideMetadata.parse(value),
})

const metadata = parseCollectionFrontmatter(guides, page.frontmatter)

The parser can be an Effect Schema decoder, Standard Schema validator, or a project-owned function. The headless loader<Page>() remains generic over each page's compiled data, so collection-specific output stays typed end to end.

Last updated 3 ago 2026