Building a Blog with Litro's Content Layer

Litro includes a content layer for Markdown — litro:content — that makes it straightforward to build a blog or documentation site. This tutorial walks through building one from scratch: writing posts, listing them, filtering by tag, and prerendering everything to static HTML.

Prerequisites

You'll need a Litro project with the 11ty-blog recipe or the starlight recipe, both of which include the content layer. Or start from scratch with pnpm create @beatzball/litro and choose 11ty-blog.

What is `litro:content`?

litro:content is a virtual module — not a filesystem API. It's available server-side only, in server/api/*.ts files and definePageData() fetchers. It reads Markdown files from your content/ directory and returns parsed posts with frontmatter.

import { getPosts, getGlobalData } from 'litro:content';

// List all posts
const posts = await getPosts();

// Get global metadata (from content/_data/global.json)
const meta = await getGlobalData();

In vite.config.ts, a browser stub returns empty async functions so the import doesn't break client-side builds. Content is always server-fetched and delivered to components via definePageData() → this.serverData.

Post Frontmatter

Litro uses 11ty-compatible frontmatter. A blog post looks like this:

---
title: My First Post
description: A short summary for SEO and the blog index.
date: 2026-03-21
tags: [tutorial, web-components]
---

# My First Post

Content goes here.

getPosts() parses all .md files in content/blog/ and returns an array of Post objects. Each post has:

title — from frontmatter
description — from frontmatter (optional)
date — from frontmatter
tags — from frontmatter (array)
body — rendered HTML
rawBody — original Markdown
url — content path (e.g. /content/blog/my-first-post)

Blog Index Page

pages/blog/index.ts lists all posts:

import { html } from 'lit';
import { customElement } from 'lit/decorators.js';
import { definePageData } from '@beatzball/litro';
import { LitroPage } from '@beatzball/litro/runtime';
import { getPosts } from 'litro:content';
import type { Post } from 'litro:content';

export const pageData = definePageData(async (_event) => {
  const allPosts = await getPosts();
  const posts = allPosts
    .filter(p => p.url.startsWith('/content/blog/'))
    .sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime());

  return { posts };
});

export const routeMeta = {
  title: 'Blog',
};

@customElement('page-blog-index')
export class BlogIndex extends LitroPage {
  override render() {
    const data = this.serverData as { posts: Post[] } | null;
    if (!data) return html`<p>Loading&hellip;</p>`;

    return html`
      <main>
        <h1>Blog</h1>
        <ul>
          ${data.posts.map(post => {
            const slug = post.url.slice('/content/blog/'.length);
            return html`
              <li>
                <a href="/blog/${slug}">${post.title}</a>
                <time>${post.date}</time>
              </li>
            `;
          })}
        </ul>
      </main>
    `;
  }
}

export default BlogIndex;

Individual Post Page

pages/blog/[slug].ts renders a single post. The slug is read from the route params via event.context.params.

import { html } from 'lit';
import { unsafeHTML } from 'lit/directives/unsafe-html.js';
import { customElement } from 'lit/decorators.js';
import { createError } from 'h3';
import { definePageData } from '@beatzball/litro';
import { LitroPage } from '@beatzball/litro/runtime';
import { getPosts } from 'litro:content';
import type { Post } from 'litro:content';

export const pageData = definePageData(async (event) => {
  const slug = event.context.params?.slug ?? '';
  const posts = await getPosts();
  const post = posts.find(p => p.url === `/content/blog/${slug}`);

  if (!post) {
    throw createError({ statusCode: 404, message: `Post not found: ${slug}` });
  }

  return { post };
});

export async function generateRoutes(): Promise<string[]> {
  const posts = await getPosts();
  return posts
    .filter(p => p.url.startsWith('/content/blog/'))
    .map(p => '/blog' + p.url.slice('/content/blog'.length));
}

export const routeMeta = {
  title: 'Blog — My Site',
};

@customElement('page-blog-slug')
export class BlogPost extends LitroPage {
  override render() {
    const data = this.serverData as { post: Post } | null;
    if (!data) return html`<p>Loading&hellip;</p>`;

    const { post } = data;
    const slug = post.url.slice('/content/blog/'.length);

    return html`
      <main>
        <article>
          <h1>${post.title}</h1>
          <time datetime="${post.date}">${post.date}</time>
          ${unsafeHTML(post.body)}
        </article>
        <a href="/blog">&larr; Back to Blog</a>
      </main>
    `;
  }
}

export default BlogPost;

generateRoutes() is the static generation hook. During litro build with NITRO_PRESET=static, Litro calls this function and prerenders each returned path.

Tag Pages

pages/blog/tags/[tag].ts lists posts filtered by tag:

import { html } from 'lit';
import { customElement } from 'lit/decorators.js';
import { createError } from 'h3';
import { definePageData } from '@beatzball/litro';
import { LitroPage } from '@beatzball/litro/runtime';
import { getPosts } from 'litro:content';
import type { Post } from 'litro:content';

export const pageData = definePageData(async (event) => {
  const tag = event.context.params?.tag ?? '';
  const posts = await getPosts();
  const tagged = posts
    .filter(p =>
      p.url.startsWith('/content/blog/') &&
      p.tags.includes(tag)
    )
    .sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime());

  if (tagged.length === 0) {
    throw createError({ statusCode: 404, message: `Tag not found: ${tag}` });
  }

  return { tag, posts: tagged };
});

export async function generateRoutes(): Promise<string[]> {
  const posts = await getPosts();
  const tags = new Set(
    posts
      .filter(p => p.url.startsWith('/content/blog/'))
      .flatMap(p => p.tags)
  );
  return Array.from(tags).map(tag => `/blog/tags/${tag}`);
}

// Tag pages should not be indexed — they're thin filtered views
export const routeMeta = {
  head: '<meta name="robots" content="noindex, follow" />',
  title: 'Blog Tags',
};

@customElement('page-blog-tags-tag')
export class BlogTagPage extends LitroPage {
  override render() {
    const data = this.serverData as { tag: string; posts: Post[] } | null;
    if (!data) return html`<p>Loading&hellip;</p>`;

    return html`
      <main>
        <h1>Posts tagged: ${data.tag}</h1>
        <ul>
          ${data.posts.map(post => {
            const slug = post.url.slice('/content/blog/'.length);
            return html`
              <li>
                <a href="/blog/${slug}">${post.title}</a>
              </li>
            `;
          })}
        </ul>
        <a href="/blog">&larr; All posts</a>
      </main>
    `;
  }
}

export default BlogTagPage;

Static Generation

For a blog deployed as static HTML (GitHub Pages, S3, Netlify), use the static preset:

NITRO_PRESET=static litro build

Litro runs generateRoutes() on each page that exports it, collects all paths, and prerenders them to dist/static/. The output is a directory of .html files ready to serve from any CDN.

For the sitemap to include your posts, make sure sitemap.xml.ts calls getPosts() and maps the slugs — the docs site template includes this.

Deploying to GitHub Pages

Add a GitHub Actions workflow at .github/workflows/deploy.yml:

name: Deploy

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    permissions:
      pages: write
      id-token: write
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
        with:
          version: 10
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: pnpm
      - run: pnpm install
      - run: pnpm run build
        env:
          NITRO_PRESET: static
          LITRO_BASE_PATH: /your-repo-name
      - uses: actions/upload-pages-artifact@v3
        with:
          path: dist/static
      - uses: actions/deploy-pages@v4

LITRO_BASE_PATH prefixes the /_litro/app.js script URL for sub-path GitHub Pages deployments (e.g. https://username.github.io/your-repo-name/). Add a .nojekyll file to public/ to prevent GitHub Pages from ignoring _ directories.

Adding an RSS Feed

Add server/routes/blog/rss.xml.ts:

import { defineEventHandler, setResponseHeader } from 'h3';
import { getPosts } from 'litro:content';

const SITE_URL = process.env.SITE_URL ?? 'https://example.com';
const SITE_TITLE = 'My Blog';

export default defineEventHandler(async (event) => {
  setResponseHeader(event, 'content-type', 'application/rss+xml; charset=utf-8');

  const posts = await getPosts();
  const blogPosts = posts
    .filter(p => p.url.startsWith('/content/blog/'))
    .sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime())
    .slice(0, 20);

  const items = blogPosts.map(post => {
    const slug = post.url.slice('/content/blog/'.length);
    const url = `${SITE_URL}/blog/${slug}`;
    return `
    <item>
      <title><![CDATA[${post.title}]]></title>
      <link>${url}</link>
      <guid>${url}</guid>
      <pubDate>${new Date(post.date).toUTCString()}</pubDate>
    </item>`;
  });

  return `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>${SITE_TITLE}</title>
    <link>${SITE_URL}/blog</link>
    <description>Latest posts from ${SITE_TITLE}</description>
    ${items.join('')}
  </channel>
</rss>`;
});

Then add /blog/rss.xml to prerender.routes in nitro.config.ts — XML routes must be listed explicitly since crawlLinks can't discover them.

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