Learn ASTRO with Real Code Examples
Updated Nov 21, 2025
Explain
Astro helps developers build highly performant websites with minimal JavaScript shipped to the client.
It supports mixing multiple UI frameworks (React, Vue, Svelte, etc.) in one project.
Astro emphasizes server rendering, static generation, and island architecture for partial hydration.
Core Features
File-based routing
Static Site Generation (SSG)
SSR optional mode
Components as server-rendered templates
Built-in content collections
Basic Concepts Overview
Astro components (.astro files)
Islands & partial hydration
Routing via filesystem
Layouts & content collections
Markdown & MDX integration
Project Structure
src/pages - routes
src/components - components
src/layouts - page layouts
src/content - content collections
astro.config.mjs - framework config
Building Workflow
Create .astro or framework components
Use server-only code by default
Hydrate specific UI islands using directives
Use Astro’s content collection for structured content
Build and deploy to static hosting or SSR platform
Difficulty Use Cases
Beginner: blogs, static pages
Intermediate: docs sites with MDX
Advanced: SSR-enabled hybrid sites
Expert: multi-framework islands
Community: theme & template creation
Comparisons
More performance-focused than Next.js
Simpler than Nuxt or SvelteKit
Better for static sites than React-based tools
More flexible in framework usage
Less suited for complex apps than full-stack frameworks
Versioning Timeline
2021 – Astro 1.0 early release
2022 – Astro 1.0 stable
2023 – Astro 2.0 with content collections
2024 – Significant SSR improvements
2025 – Multi-runtime stabilization & new integrations
Glossary
Islands: isolated interactive components
Hydration: turning HTML into an interactive component
Frontmatter: server-side code block in Astro
Adapters: enable SSR on different platforms
Content Collections: schema-validated content system