Elysia

We're talking handling more requests per second than most Go and Rust web frameworks, in TypeScript.

The developer experience is the other selling point. End-to-end type safety. Define your API once and the types flow from server to client automatically. Validation, OpenAPI docs, and auth plugins built in. The API feels modern in a way that Express and Fastify don't.

MIT. The Bun ecosystem's answer to Express.

The catch: it requires Bun. If your deployment target is Node.js, Lambda, or Cloudflare Workers, Elysia won't work. Bun adoption is growing but it's not Node-level ubiquitous yet. The ecosystem of middleware and plugins is smaller than Express (thousands of packages) or even Fastify. And 'fastest benchmarks' matter less than you think in production where your database query takes 100x longer than framework overhead.