Content collections and routing

Content Collections reads files in src/data/posts and turns them into typed data. The file path becomes the URL slug, so nested folders map directly to nested routes.

Example file structure

src/data/posts/
  welcome-to-tanstack-start-blog.mdx
  guides/
    rss-and-sitemaps.mdx
    og-images.mdx

This structure maps to:

/posts/welcome-to-tanstack-start-blog
/posts/guides/rss-and-sitemaps
/posts/guides/og-images

Frontmatter requirements

Required fields

---
title: "My post"
description: "Short summary for cards and meta tags."
publishDate: "2026-02-01"
tags:
  - template
  - mdx
---

Typed metadata

Content collections adds readingTime, date, and mdast fields so you can build features like reading-time badges or custom indexes without extra parsing.