BackendTypeScriptEnd-To-End Type SafetyBunWeb StandardsREST APIsWebSockets

Elysia

Ergonomic Framework for Humans

Overview

Elysia is a Bun-first TypeScript backend framework focused on speed, end-to-end type safety, and a great developer experience. It’s optimized for Bun but designed around Web Standards, with integrations for things like WebSockets and OpenAPI/Swagger.

Rendering Modes

Server

Best For

Bun applications, Type-safe APIs, Real-time apps

License

MIT

Quick Start

bun create elysia app

Quick start: bun create elysia app → bun dev Optional: run on Node.js via the Node adapter (@elysiajs/node).

Key Features

End-to-end Type Safety

Bun Optimized

OpenAPI Generation

Eden Connector

Pros & Cons

Pros

Excellent TypeScript DX
Very fast with Bun
Great ergonomics

Cons

Requires Bun
Very new

Common Use Cases

REST APIsWebSockets / Realtime ServicesOpenAPI / Swagger API DocsType-Safe Client-Server CommunicationDeployable Production APIsEdge-Style Runtimes

Compatible Cloud Servers

Render Free

Free web services for side projects

Railway

Fly.io Scale

For production workloads at scale

Find Elysia Experts

Looking for professional help with your Elysia project? Here are top certified agencies and developers.

Top Agencies

Alpina Tech

#1 Recommended

Craft custom, responsive websites using expert code and stunning design. Build your site with a flexible CMS and premium hosting to boost your digital presence.

.NFQ | Netzfrequenz GmbH

We are a Germany-based digital agency specializing in innovative and data-driven solutions across the entire customer journey. With a strong foundation in technology, strategy, and creativity, we craft tailored digital experiences that enhance brand presence and business growth.

GRANITE

We are a global digital transformation partner with over 160 industry experts, delivering comprehensive digital solutions across experience design, technology engineering, digital marketing, brand innovation, and video production.

NOTUM

#1 Recommended

We are CMS-centered agency with 7 years of CMS experience. We build scalable corporate websites for scale-ups with headless CMS solutions. From design to deployment, we deliver complete, reliable support.

QBurst

QBurst is a digital engineering company that crafts delightful client experiences through AI-driven software engineering and data solutions.