Elysia Web Framework

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library 1.4.28 ·javascript
verified May 27, 2026

Elysia is a high-performance, ergonomic web framework built specifically for the Bun runtime, emphasizing end-to-end type safety and an exceptional developer experience. It provides a comprehensive set of features for building web servers and APIs, including robust routing, middleware, declarative schema validation (powered by `@sinclair/typebox`), and integrated WebSocket support. The framework is currently stable at version 1.4.28 and maintains a rapid release cadence, frequently incorporating improvements and bug fixes, often in synergy with Bun's development. Its core differentiators include native integration with Bun for superior performance, extensive TypeScript support providing compile-time and runtime type integrity, and a strong focus on developer productivity. Elysia aims to offer a unified type system where types serve as a single source of truth across the application, from API definition to automatic documentation generation, streamlining development and reducing errors.

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