Elysia

Overview

Elysia is a Bun-native HTTP framework built for speed and developer experience. End-to-end type safety from server to client via Eden Treaty, schema validation baked in, and performance that rivals Go/Rust frameworks. Think Express but with types, on Bun.

When to Use

• Building REST APIs on Bun (instead of Express/Fastify)
• Need end-to-end type safety — server defines routes, client auto-infers types
• WebSocket server with typed messages
• High-performance API that needs to handle 100K+ req/sec
• Rapid prototyping with auto-generated OpenAPI/Swagger docs

Instructions

Getting Started