Data Fetching

Fetch inside frontmatter to run at build-time (SSG) or request-time (SSR):

---
const res = await fetch('https://api.example.com/posts');
const posts = await res.json();
---
<ul>
  {posts.map((p) => <li>{p.title}</li>)}

</ul>

For static sites, the fetch runs during npm run build. To enable SSR, configure an adapter and set output: 'server' in astro.config.*.