Bun vs Node.js in 2026: Which Runtime Should You Actually Use?

Bun vs Node.js in 2026: Which Runtime Should You Actually Use? The JavaScript runtime wars are heating up. Bun has matured dramatically since its 1.0 release, and in 2026, the question is no longer "is Bun ready?" — it's "which one fits your project?" Let's break it down with real numbers, honest trade-offs, and a clear decision framework. What Is Bun, and Why Does It Matter? Bun is a JavaScript runtime built from scratch using Zig and JavaScriptCore (WebKit's engine). It's designed to be: Faster — dramatically so in benchmarks All-in-one — bundler + test runner + package manager built in Node-compatible — most Node.js code runs without changes Node.js, by contrast, uses V8 (Chrome's engine) and has a 15-year head start — with a massive ecosystem, battle-tested reliability, and a vast community. Performance: The Real Numbers Bun is genuinely fast. Here's what 2026 benchmarks show: HTTP Server Throughput (requests/sec) Bun.serve() ~120,000 req/s Node.js (fastify) ~65,000 req/s Node.js (