Astro is one of the most exciting frameworks to emerge in the modern web development ecosystem. It takes a fundamentally different approach from frameworks like Next.js or Nuxt by defaulting to zero client-side JavaScript — your pages are fully rendered at build time and ship as plain HTML.

Why Astro?

The web has a performance problem. Modern JavaScript-heavy frameworks ship massive bundles to the client, forcing users to download, parse, and execute megabytes of JS just to see static content. Astro’s answer is simple: if the content doesn’t need to be interactive, don’t ship JavaScript for it.

The results speak for themselves. A typical Astro site scores close to perfect on Google Lighthouse without any manual optimization.

Setting Up Your First Project

Getting started is straightforward with Bun (or npm if you prefer):

bun create astro@latest my-site
cd my-site
bun dev

Astro’s CLI wizard walks you through the setup. I recommend choosing the “Minimal” template to understand the structure from the ground up rather than starting with a pre-built theme.

The Astro Component Model

Astro components have a unique two-part structure: a frontmatter code fence (the --- block) for server-side logic, and the template below it.

---
// This runs at build time on the server
const greeting = "Hello, World!";
const items = await fetch('/api/items').then(r => r.json());
---

<!-- This is the HTML template -->
<h1>{greeting}</h1>
<ul>
  {items.map(item => <li>{item.name}</li>)}
</ul>

The key insight: everything in the frontmatter is stripped from the final bundle. No JavaScript is shipped to the client unless you explicitly ask for it with client:load or similar directives.

Islands Architecture

Astro’s “Islands” concept lets you sprinkle interactivity only where needed. You can use React, Vue, Svelte, or Solid components — and Astro will only hydrate them on the client:

---
import ReactCounter from './Counter.jsx';
import VueChart from './Chart.vue';
---

<!-- Static by default -->
<h1>My Dashboard</h1>

<!-- Only this counter is hydrated -->
<ReactCounter client:load />

<!-- Chart loads only when visible in viewport -->
<VueChart client:visible />

This means a page could be 95% static HTML with only the interactive bits actually loading JavaScript. That’s a massive win for performance.

Content Collections

One of Astro’s best features for blogs and documentation is Content Collections — a type-safe system for managing Markdown and MDX files. You define a schema with Zod, and Astro validates all your content files at build time:

// src/content/config.ts
import { defineCollection, z } from 'astro:content';

const blog = defineCollection({
  type: 'content',
  schema: z.object({
    title: z.string(),
    date: z.coerce.date(),
    tags: z.array(z.string()),
  }),
});

export const collections = { blog };

This site uses exactly this pattern. Every post you’re reading is a Markdown file that Astro validates, transforms, and renders.

Deployment

Astro builds to pure static files by default, which means you can deploy anywhere: GitHub Pages, Netlify, Vercel, Cloudflare Pages, or even a plain nginx server. With GitHub Actions:

- name: Build
  run: bun run build

- name: Deploy to Pages
  uses: actions/deploy-pages@v4

The build output is just HTML, CSS, and minimal JavaScript — it’s fast, cheap to host, and scales infinitely via CDN.

Conclusion

Astro is an excellent choice for any content-heavy site: portfolios, blogs, documentation, marketing pages. The zero-JavaScript-by-default philosophy aligns perfectly with the web’s fundamental nature as a document delivery system. When you need interactivity, the Islands architecture gives you surgical control over what gets hydrated.

If you haven’t tried Astro yet, the official docs are excellent. Start with a small project and let the simplicity surprise you.