Infrastructure

Bun

All-in-one JavaScript runtime, bundler, test runner, and package manager. Rewritten in Rust as of Bun 1.4 (August 2026), drop-in compatible with Node, dramatically faster install and start times.

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Bun bundles a JavaScript runtime, package manager, bundler, and test runner into a single binary written in Rust. It is largely Node-compatible, so most apps drop in without changes, and it is much faster: bun install routinely runs 10x faster than npm, and the runtime starts cold faster than Node. Bun also has first-class TypeScript and JSX support out of the box. It is the runtime of choice for new TypeScript projects that want speed without giving up the npm ecosystem.

runtime javascript typescript bundler package-manager

Bun at a glance

Last verified October 17, 2026

Pricing: Free and open source (MIT)
Install: curl -fsSL https://bun.com/install | bash
npm install -g bun
brew install oven-sh/bun/bun
Models: Not an AI model runner: a JavaScript and TypeScript runtime built on JavaScriptCore, with npm package compatibility and its own package manager, bundler, and test runner. Bun 1.4 targets Node.js 26.3.0 API compatibility.
Recent changes: Oct 10v1.4.3 adds bun check, a built-in TypeScript type checker, a --check flag for bun run, bun build, and bun test, 67-89% less idle CPU, and up to 2.7x faster large node:http responses.
Sep 4v1.4.1 adds HTTP/2 in Bun.serve, bun install --offline and --prefer-offline, crypto.argon2, and tree-shaking through dynamic import().
Aug 20Bun 1.4 rewrites Bun in Rust, reaches Node.js 26.3.0 compatibility with 1,517 newly passing tests, adds parallel test and run, Windows ARM64, and an opt-in global virtual store for up to 7x faster installs.

Sources: Bun installation docs, Bun blog, Bun v1.4.3, Bun 1.4, oven-sh/bun LICENSE

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All-in-one JavaScript runtime, bundler, test runner, and package manager. Rewritten in Rust as of Bun 1.4 (August 2026), drop-in compatible with Node, dramatically faster install and start times.

Try Bun

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