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Home / Migrations / Node.js → Bun

Node.js → Bun

easy

Bun is 3-4x faster for HTTP throughput and startup time. Drop-in for most Node.js apps. Native TypeScript, test runner, bundler, and package manager included.

Estimated: 1-3h · 5 steps

Progress0%

Step 1: Install Bun

curl -fsSL https://bun.sh/install | bash

Step 2: Replace node commands

Most scripts: node index.ts → bun index.ts. package.json scripts auto-detected.

bun run start

Step 3: Replace package manager

npm install → bun install (10-25x faster). Reads existing package.json and lockfile.

bun install

Step 4: Test Node.js compatibility

Bun supports most Node.js built-ins. Known gaps: vm module, some crypto functions, native addons (.node files).

Step 5: Use Bun native APIs

Optional: replace node:fs with Bun.file(), replace http with Bun.serve() for max performance.

✓ App starts and serves requests. Tests pass. npm scripts work.

What this migration involves

Moving from Node.js to Bun is rated easy and takes about 1-3h on a typical project. The guide breaks it into 5 steps, 3 of which ship with runnable commands and 1 with a verification check.

Bun data →

Related migrations

Node.js → Deno 2 — medium, 4-12h

FAQ

How long does migrating from Node.js to Bun take?

Around 1-3h for a typical project — 5 steps, difficulty rated easy, 3 of them with copy-paste commands.

Is moving from Node.js to Bun reversible?

No reverse guide is tracked yet, so treat this as a one-way move and keep a full export of your Node.js data before you start.

What does Bun cost compared to Node.js?

Bun: open-source from $0/mo, free plan available.