elysiajs

SKILL.md

ElysiaJS Development Skill

Always consult elysiajs.com/llms.txt for code examples and latest API.

Overview

ElysiaJS is a TypeScript framework for building Bun-first (but not limited to Bun) type-safe, high-performance backend servers. This skill provides comprehensive guidance for developing with Elysia, including routing, validation, authentication, plugins, integrations, and deployment.

When to Use This Skill

Trigger this skill when the user asks to:

Create or modify ElysiaJS routes, handlers, or servers

Setup validation with TypeBox or other schema libraries (Zod, Valibot)

Implement authentication (JWT, session-based, macros, guards)

Add plugins (CORS, OpenAPI, Static files, JWT)

Integrate with external services (Drizzle ORM, Better Auth, Next.js, Eden Treaty)

Setup WebSocket endpoints for real-time features

Create unit tests for Elysia instances

Deploy Elysia servers to production