Elysia

Health v2 · maintenance only

Adoption not part of the score

19239 stars · 611 forks observed · 2026-10-13

What it is AI-extracted, prompt v1, taxonomy v1, 2026-10-19, confidence 0.98

Elysia is a TypeScript‑first web framework that provides end‑to‑end type safety and a highly ergonomic API. It runs on Bun and Node.js, offering performance comparable to low‑level servers while keeping the developer experience simple.

Use cases

• build a fast HTTP API with full TypeScript type inference
• create real‑time WebSocket services with minimal boilerplate
• serve static files and streams in a Bun‑optimized server
• develop a backend for a single‑page application with automatic OpenAPI generation
• replace Express or Fastify with a more type‑safe, ergonomic alternative

When to choose

• you need ultra‑fast request handling and are using Bun or Node.js
• type safety across request validation, handlers, and OpenAPI docs is a priority
• you prefer a framework that feels like plain JavaScript/TypeScript with minimal ceremony
• you want built‑in support for routing, middleware, and WebSocket handling out of the box

When to avoid

• your project relies on a runtime other than Bun or Node.js (e.g., Deno, browser)
• you require a large ecosystem of plugins that only exist for more established frameworks
• you need built‑in support for features not yet covered by Elysia, such as complex GraphQL servers

Facets

framework · maturity active

http-server web-framework api-framework routing middleware web-development backend bun cross-platform typescript ergonomic type-safety bun-native high-performance developer-experience nodejs web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="elysiajs/elysia")