Bun 2.0 Makes Node.js Feel Ancient — Here's Why Teams Are Migrating

Oven released Bun 2.0, achieving 99% Node.js API compatibility and declaring production-readiness. The runtime includes a bundler, test runner, package manager, and Node-compatible module system — all dramatically faster than their Node.js/npm equivalents. Benchmarks show 5x faster cold starts, 3x faster request handling, and 10x faster package installation.

For three years, Bun has been 'the fast alternative you can't quite use in production.' Version 2.0 changes that. Many companies can now migrate production workloads and save meaningful money on compute while improving response times. Developer velocity also improves with faster test and build cycles.

Serverless platforms (Vercel, Cloudflare Workers, AWS Lambda) are adding first-class Bun support. Major frameworks (Next.js, Remix, Hono) now test against Bun in CI. Meanwhile, Node.js maintainers are accelerating their own performance improvements — Node 22 and 23 showed major gains motivated partly by Bun competition.

Watch for managed hosting support (Heroku, Railway, Render). Also track Bun's native module ecosystem — still a weak point versus Node's decades of community packages. Deno 2.0 is competing aggressively for the same market — expect more feature leapfrogging between the two.