Bun Server

Bun.serve for ultra-fast HTTP.

BackendModerate

Stack Components

RuntimeBun 1

ServerBun.serve

ORMDrizzle 0.30

DBPostgreSQL 16

Why

Native, zero-config, 3x faster than Node. Node.js, Go, and Python are the top 3 backend languages (Stack Overflow 2024).

Go's goroutines handle 100k+ concurrent connections per process; Node's event loop excels at I/O-bound workloads.

When

Use for Bun-native apps. Avoid for Node ecosystem deps.

How

1. bun init 2. Use Bun.serve() 3. Define routes 4. Bun runs file directly 5. Add environment configuration — cp .env.example .env && edit values 6. Run tests — npm test or pnpm test to verify setup 7. Deploy — git push to trigger CI/CD or manual deploy

Example

Bun.serve({ port: 3000, fetch(req) { return new Response('Hello') }, }) // Bun Server — usage example import { BunServer } from "node-bun"; const result = await bunserver({ input: "data" }); console.log(result);

Common Problems

⚠Node compat — some packages may not work
⚠Hot reload — use --watch flag
⚠Configuration drift between environments — use infrastructure-as-code (Terraform/Pulumi) to keep dev/staging/prod identical

Best Practices

✓Use Bun.sql for native PG
✓Leverage Bun's bundler
✓Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit

FAQ

What is Bun Server and what projects is it for?

Bun.serve for ultra-fast HTTP. It pairs layered technologies for end-to-end type safety and out-of-the-box deploys, fitting everything from MVPs to production SaaS.

How do I spin up a working demo with Bun Server in 10 minutes?

Two steps: (1) bun init; (2) Use Bun.serve(). Get the local dev server running, then wire one real data source to verify the end-to-end loop.

What is the most common pitfall with Bun Server and how do I avoid it?

The most common pitfall is: Node compat — some packages may not work. Avoid it by adding the matching checklist to your PR template and running type-check + lint + unit tests in CI — three gates before merge.

What are the best practices for Bun Server?

Best practices for Bun Server include: Use Bun.sql for native PG; Leverage Bun's bundler; Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit. The first one — "Use Bun.sql for native PG" — should be set up at project init to avoid costly rework later.

When should I NOT choose Bun Server?

Pick something else in three cases: (1) the team has zero experience with the core framework and the deadline is tight (learning-curve risk); (2) it's a pure content/marketing site (Astro is lighter); (3) you need very high throughput (>10k RPS) or strict-consistency microservices (Go/Rust). Bun Server shines for mid-to-high complexity full-stack and API work — don't over-engineer simple static pages with it.