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Elysia

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description Elysia Overview

Elysia is a web framework for building servers and APIs with Bun, a JavaScript and TypeScript runtime. It emphasizes strong TypeScript inference, schema-based validation, and a compact API for defining routes, middleware, and application state. The framework can generate OpenAPI documentation through an optional plugin and is intended for developers creating type-safe backend services in the Bun ecosystem; it is not an Erlang or Elixir framework.

help Elysia FAQ

What programming language is the Elysia framework built for?

Although it shares a name with concepts from Erlang/Elixir, the Elysia framework is actually built for the Bun JavaScript runtime. It is a fast, functional web framework tailored specifically for TypeScript developers. It leverages Bun's native speed to achieve blazing fast server-side performance.

Does Elysia offer type safety for API endpoints?

Yes, Elysia heavily emphasizes type safety by utilizing static analysis to validate incoming data against your TypeScript types. It provides an Eden treaty client that allows frontend applications to consume your API with fully end-to-end type safety. This eliminates runtime errors caused by mismatched data payloads between the client and server.

Does the Elysia framework automatically generate API documentation?

Yes, Elysia includes built-in features for automatic API documentation generation. As you define your routes and type schemas, the framework can automatically generate OpenAPI-compatible Swagger documentation. This saves developers hours of manually writing and updating API contracts.

Do I need to use the Bun runtime to run the Elysia framework?

Yes, because Elysia is heavily optimized for the Bun runtime, you must run your application using Bun rather than traditional Node.js. It takes advantage of Bun's internal APIs to outperform many Node-based web frameworks. This deep integration is exactly what allows Elysia to handle thousands of requests per second with minimal overhead.

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