Elysia

Elysia.js is the high-performance, ergonomic TypeScript web framework engineered for the Bun runtime, delivering end-to-end type safety for API development.

Elysia.js is a cutting-edge server-side framework built to maximize the speed of the Bun runtime, often benchmarked as significantly faster than alternatives like Express. Its core strength is end-to-end type safety: it leverages TypeScript and static analysis to infer types directly from your schema, ensuring data integrity from validation through to the handler. This focus on a minimal, powerful syntax and first-class developer experience—including built-in support for OpenAPI (Swagger) and WebSockets—makes it the top choice for building robust, high-throughput REST APIs and services.

https://elysiajs.com