I have a gripe with Next.js API routes: every endpoint needs its own file. I've been exploring Elysia.js as a potential solution.

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Elysia.js is a TypeScript-first API framework for Bun that addresses Next.js API route organization issues by allowing all routes to be defined in a single file using a chaining syntax. It provides end-to-end type safety through the Eden companion library, eliminating the need for code generation while maintaining standard HTTP endpoints. The framework uses TypeBox for inline schema validation that doubles as TypeScript type generation, and follows the WinterTC standard for cross-runtime deployment compatibility.

Elysia.js: Type-Safe APIs Without the Mess

Almost finished a project where I used it, I liked it a lot, strong typing on endpoints is really amazing, and I also liked a lot the way it handles server sent events.
If you are starting a new backend project, I really recommend to give it a shot

I use it for all my new personal projects, and converted existing ones as well. Can highly recommend 👍.