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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.

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.