elysiajs/elysia

Analysis updated 2026-05-18

★ 18,308TypeScriptAudience · developerComplexity · 3/5LicenseSetup · easy

Mindmap

mindmap
  root((Elysia))
    What it does
      HTTP server framework
      Type-safe endpoints
      Error prevention
    Tech Stack
      TypeScript
      Bun runtime
    Use Cases
      REST APIs
      Web services
      Type-safe backends
    Developer Experience
      Straightforward syntax
      Built-in validation
      Fast feedback

mindmap root((Elysia)) What it does HTTP server framework Type-safe endpoints Error prevention Tech Stack TypeScript Bun runtime Use Cases REST APIs Web services Type-safe backends Developer Experience Straightforward syntax Built-in validation Fast feedback

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What do people build with it?

USE CASE 1

Build REST APIs with automatic type checking between client and server code.

USE CASE 2

Create web services where data type errors are caught before deployment.

USE CASE 3

Develop HTTP endpoints with built-in validation and type safety.

What is it built with?

TypeScriptBun

How does it compare?

	elysiajs/elysia	linkwarden/linkwarden	wasp-lang/wasp
Stars	18,308	18,306	18,310
Language	TypeScript	TypeScript	TypeScript
Setup difficulty	easy	moderate	moderate
Complexity	3/5	3/5	3/5
Audience	developer	general	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

Requires Bun runtime to be installed, standard npm/bun install otherwise.

Use freely for any purpose including commercial, as long as you keep the copyright notice.

In plain English

Elysia is a web server framework written in TypeScript, designed to make building HTTP servers feel straightforward and developer-friendly. Its main selling points are end-to-end type safety, meaning errors caused by mismatched data types between different parts of your code can be caught before the app runs, and a focus on good developer experience. It is built to run on Bun, a JavaScript runtime environment. The readme is sparse and points to external documentation for details.

Copy-paste prompts

Prompt 1

Show me how to set up a basic Elysia server with type-safe route handlers.

Prompt 2

How do I define request and response types in Elysia to catch mismatches early?

Prompt 3

Create an example Elysia endpoint that validates incoming JSON and returns typed data.

Prompt 4

What's the difference between Elysia and Express, and when should I use Elysia?

Frequently asked questions

What is elysia?

TypeScript web server framework with end-to-end type safety, built for Bun runtime. Catches data type mismatches before your app runs.

What language is elysia written in?

Mainly TypeScript. The stack also includes TypeScript, Bun.

What license does elysia use?

Use freely for any purpose including commercial, as long as you keep the copyright notice.

How hard is elysia to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is elysia for?

Mainly developer.

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