Bun vs Node.js: JavaScript Runtime Battle in 2026

Bun launched in 2022 with claims of 3–10x better performance than Node.js. Now in 2026, after 1.0 and multiple major releases, the question isn't whether Bun is fast — it demonstrably is. The question is whether performance alone justifies switching from the most established runtime in web development. This comparison covers everything you need to decide. Quick Comparison Table Feature Bun Node.js Engine JavaScriptCore (WebKit) V8 (Chrome) First release 2022 2009 Version (2026) 1.x 22.x LTS Performance 2–5x faster (HTTP, file I/O) Baseline Package manager Built-in ( bun install ) npm (separate) Bundler Built-in Requires webpack/vite/esbuild Test runner Built-in ( bun test ) Requires jest/vitest TypeScript Native (no compilation step) Requires ts-node or transpilation JSX Native Requires Babel/transpiler .env loading Built-in Requires dotenv package Node.js compatibility ~98% (most APIs work) 100% (it is Node.js) npm ecosystem Compatible Native Windows support Yes (since 1.1) Yes (since