**Primary keywords:** bun hosting, bun.js cloud hosting, deploy bun app, bun javascript hosting, bun runtime hosting
---
Bun is a JavaScript runtime built for speed. It starts faster, installs packages faster, and runs tests faster than its predecessors. It's compatible with Node.js APIs, has a built-in bundler and test runner, and uses JavaScriptCore instead of V8. If you're building a new JavaScript backend today, Bun is worth serious consideration — and it deserves cloud hosting that keeps up with it.
## Bun's Advantages in a Cloud Context
Bun's speed characteristics translate directly to cloud hosting benefits:
- **Fast startup:** Cold starts are noticeably quicker than Node.js, which matters for scaling events
- **Low memory usage:** Bun typically uses less memory than Node.js for equivalent workloads
- **Built-in APIs:** HTTP server, file I/O, WebSockets, and SQLite are all built in — fewer npm dependencies
- **Node.js compatibility:** Most npm packages work without modification
## A Simple Bun HTTP Server
```typescript
// index.ts
const server = Bun.serve();
console.log(`Bun server running on port $server.port`);
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```
## Project Structure
```
my-bun-app/
├── index.ts
├── package.json
└── Procfile
```
### package.json
```json
"name": "my-bun-app",
"version": "1.0.0",
"scripts":
"start": "bun run index.ts",
"dev": "bun --hot run index.ts"
,
"dependencies":
"hono": "^4.3.11"
```
### Procfile
```
web: bun run index.ts
```
Bun runs TypeScript directly — no compilation step, no `ts-node`, no build pipeline.
## Deploying to ApexWeave
```bash
apexweave login
apexweave deploy
by ApexWeave
```
ApexWeave detects Bun from a `bun.lockb` file or an explicit runtime declaration, installs dependencies with `bun install`, and starts your app.
## Environment Variables
```bash
apexweave env:set DATABASE_URL=postgres://user:pass@host:5432/mydb
apexweave env:set JWT_SECRET=your-secret
apexweave env:set NODE_ENV=production
```
In your application:
```typescript
const dbUrl = process.env.DATABASE_URL;
const secret = process.env.JWT_SECRET;
```
Bun is fully compatible with Node.js's `process.env`, so no changes needed if you're migrating from Node.js.
## Building APIs with Hono on Bun
Hono is an excellent match for Bun — lightweight, TypeScript-first, and fast:
```typescript
// index.ts
import Hono from "hono";
import cors from "hono/cors";
import logger from "hono/logger";
const app = new Hono();
app.use("*", logger());
app.use("/api/*", cors());
app.get("/health", (c) => c.json( status: "ok" ));
app.get("/api/users", async (c) =>
const users = await db.query("SELECT id, email FROM users");
return c.json(users);
);
app.post("/api/users", async (c) =>
const body = await c.req.json();
const user = await db.create(body);
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return c.json(user, 201);
);
export default
port: parseInt(process.env.PORT ;
```
## Database Access
### Bun's Built-in SQLite
```typescript
import Database from "bun:sqlite";
const db = new Database("myapp.db");
db.run(`
CREATE TABLE IF NOT EXISTS users (
id INTEGER PRIMARY KEY AUTOINCREMENT,
email TEXT UNIQUE NOT NULL
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)
`);
const getUser = db.prepare("SELECT * FROM users WHERE id = ?");
const user = getUser.get(1);
```
### PostgreSQL with Postgres.js
```typescript
import postgres from "postgres";
const sql = postgres(process.env.DATABASE_URL!);
const users = await sql`SELECT id, email FROM users WHERE active = true`;
```
Bun runs `postgres` (the npm package) without any compatibility shims needed.
## WebSockets with Bun
Bun has excellent built-in WebSocket support:
```typescript
const server = Bun.serve( "3000"),
fetch(req, server)
if (req.url.endsWith("/ws"))
const upgraded = server.upgrade(req);
if (!upgraded) return new Response("WebSocket upgrade failed", status: 400 );
return new Response("Hello!");
,
websocket:
open(ws)
console.log("Client connected");
ws.subscribe("broadcast");
,
message(ws, msg)
server.publish("broadcast", msg);
,
close(ws)
console.log("Client disconnected");
,
,
);
```
## Streaming Logs
```bash
apexweave logs --follow
```
Bun's console output and uncaught errors both appear here. Bun formats errors with useful stack traces by default.
## SSH Access
```bash
apexweave ssh
bun --version
bun repl
```
## Hot Module Replacement in Development
```typescript
// --hot flag watches for changes
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// package.json
"scripts":
"dev": "bun --hot run index.ts"
```
In production (`apexweave deploy`), this flag is not used — the process is managed by the platform.
## Migrating from Node.js to Bun
Bun's Node.js compatibility is extensive. For most Express or Fastify apps:
1. Replace `node` with `bun` in your Procfile
2. Run `bun install` instead of `npm install`
3. That's often all that's required
Performance improvements — especially for I/O-heavy services — are often noticeable immediately.
## Plan Recommendations
- **AppForge Starter ($5/mo):** APIs, bots, lightweight services
- **AppForge Pro ($10/mo):** Production applications, WebSocket services
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- **AppForge XL ($15/mo):** High-throughput APIs, real-time applications, compute-intensive workloads
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## Why Bun Deserves Proper Cloud Hosting
Bun's performance advantages are most apparent under realistic workloads — sustained concurrent requests, many small operations, or high-frequency I/O. A managed cloud environment with proper resource allocation lets you actually see those benefits. ApexWeave's infrastructure ensures your Bun app runs on consistently provisioned hardware without noisy-neighbor problems.
Claim your **free 7-day ApexWeave trial** and deploy your Bun app today. No credit card required. `apexweave deploy` and you're live.