This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. Bun vs Node.js vs Deno (2026): Best JavaScript Runtime? The JavaScript runtime you pick affects install speed, testing, and production performance. Node.js has ruled for 15 years, but Bun and Deno are challenging with fresh approaches. Here's the honest comparison for 2026. Quick Comparison Bun Node.js Deno Engine JavaScriptCore (Safari) V8 (Chrome) Language JS + Zig (internals) C++ TypeScript Native (no config) Via ts-node/tsx Package manager bun install (fastest) npm, yarn, pnpm Module system CJS + ESM CJS + ESM Testing Built-in (Jest-compatible) Third-party (Vitest, Jest) Web APIs Partial Partial npm compat 90%+ 100% (the original) Single binary Yes (bun build) Yes (node --compile) Ecosystem Growing (npm compat helps) Largest (3M+ packages) Bun — The Speed Demon Bun is designed for speed above all else. bun install is dramatically faster than npm or yarn.…