Elysia (Bun Framework)

Build blazing-fast APIs with Elysia, the Bun-native web framework. Generates type-safe routes, validation schemas, WebSocket handlers, and Eden Treaty RPC clients with end-to-end type inference.

This skill helps you build high-performance APIs with Elysia on Bun. It generates route handlers with full type inference, request/response validation, lifecycle hooks, WebSocket support, Eden Treaty typed clients, and Swagger documentation — all with Bun's native speed.

When to use

Use when building APIs on Bun for maximum performance, creating typed RPC-style backends, or when you want Express-like DX with end-to-end type safety.

Examples

Type-safe REST API

Create a fully typed API with validation

Build an Elysia REST API with typed route params, body validation using t.Object, error handling, and Swagger docs

Eden Treaty client

Generate a typed RPC client for frontend

Set up Eden Treaty to create a fully typed client from my Elysia API that I can use in my React frontend with auto-complete

WebSocket chat server

Build a real-time WebSocket server

Create an Elysia WebSocket server for a chat app with rooms, authentication, and message history using Bun's native WebSocket