JAMstack with Bun
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⚡ JAMstack with Bun — Blazing-Fast Modern Web Apps
JAMstack (JavaScript, APIs, Markup) is redefining how we build high-performance, scalable web applications. With Bun—a lightning-fast all-in-one JavaScript runtime—developers can supercharge JAMstack development like never before. In this post, we’ll explore how to build JAMstack apps using Bun, discuss its advantages, and show you how to deploy quickly 🚀.
📚 What is JAMstack?
JAMstack isn’t a specific technology but an architecture. It stands for:
- JavaScript – Handles dynamic functionalities via client-side scripts.
- APIs – External or serverless functions take care of backend logic.
- Markup – Pre-rendered HTML, often built using site generators.
The goal of JAMstack is to deliver static sites that feel dynamic, with blazing performance, better SEO, and easy scalability 🌍.
🥐 Why Bun is Perfect for JAMstack?
- Bundler built-in – Bun bundles your code out-of-the-box without extra tools like Webpack or Vite.
- Lightning fast server – Bun’s native HTTP server outperforms traditional runtimes like Node.
- Package manager – No more waiting;
bun installis insanely fast. - TypeScript and JSX support – No config required for modern syntax 🎯.
🛠️ Setting Up a JAMstack Project with Bun
Let’s walk through a simple JAMstack app with Bun using static files and a serverless-style API.
// serve.ts
Bun.serve({
port: 3000,
fetch(req) {
if (req.url.endsWith("/api/hello")) {
return new Response(JSON.stringify({ message: "Hello from Bun!" }), {
headers: { "Content-Type": "application/json" }
});
}
return new Response(Bun.file("index.html"));
}
});
Then, create your static HTML:
<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>JAMstack with Bun</title>
</head>
<body>
<h1>🚀 Welcome to Bun JAMstack</h1>
<button onclick="fetchMessage()">Call API</button>
<script>
async function fetchMessage() {
const res = await fetch("/api/hello");
const data = await res.json();
alert(data.message);
}
</script>
</body>
</html>
🌐 API Routes in Bun
You can easily create multiple API endpoints inside your Bun app. You don’t need Express or any framework. It’s raw power with minimal syntax:
if (req.url.endsWith("/api/contact")) {
// handle form submission
}
This aligns beautifully with JAMstack’s philosophy of using APIs for backend logic.
⚙️ Generating Static Files
JAMstack apps typically use static site generators. While Bun doesn’t have its own yet, you can use Eleventy, Astro, or write custom scripts. Bun supports most npm packages, so your favorite generator will likely work 🛠️.
// Example using Bun to build static content
import { writeFileSync } from "fs";
writeFileSync("dist/index.html", "<h1>Pre-rendered content</h1>");
🚀 Deploying a Bun JAMstack App
Since JAMstack apps are mostly static with API endpoints, they are easy to deploy:
- Vercel / Netlify – Deploy the static part, and set up serverless functions for APIs.
- Railway / Render – Deploy your Bun server directly as a full backend app.
- Cloudflare Workers – With a little tweaking, Bun APIs can be ported to edge functions.
🧠 Best Practices for Bun + JAMstack
- Use Bun's native bundler to optimize and minify assets.
- Leverage
Bun.serveto handle serverless-style routing without third-party libs. - Split static from API logic to stay true to JAMstack philosophy.
- Cache aggressively using CDN headers for static files 🌐.
🎯 Conclusion
Bun and JAMstack are a match made in performance heaven. Whether you're building a personal blog, a blazing portfolio, or a dynamic startup MVP — this combo offers modern tooling with almost zero overhead. Start simple, scale fast, and ship confidently with Bun + JAMstack ⚡.
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