Ergonomic Framework for Humans

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ElysiaJS — An Ergonomic Framework for Humans

If you're a developer who loves TypeScript, hates boilerplate, and wants insane performance without sacrificing developer experience, ElysiaJS is something you should know about. Built on top of Bun, ElysiaJS aims to be the most ergonomic and type-safe backend framework ever created.

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What Is ElysiaJS?

ElysiaJS is a backend framework designed for humans. Instead of forcing developers to pick between flexibility, performance, and type safety, Elysia gives you all three. It focuses on:

• Ergonomic APIs – code that looks clean and feels natural
• End-to-End Type Safety – your server and client share the same types
• Speed – built on Bun, it’s faster than Express and Fastify

ElysiaJS = Express + TypeScript + Turbocharged Performance

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Why Use ElysiaJS?

Unlike traditional frameworks where routing, validation, and documentation are separate tools, Elysia handles all of it together.

Feature	ElysiaJS
Routing	Simple and intuitive
Validation	Built-in and type-safe
Performance	Extremely fast via Bun
Documentation	Auto-generates OpenAPI
Real-Time	Native WebSocket support
Client Sync	Types shared via Eden Treaty

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Your First ElysiaJS App

import { Elysia } from 'elysia'

new Elysia()
  .get('/', 'Hello World')
  .listen(3000)

That's it — your server is running.

import { Elysia, file } from 'elysia'

new Elysia()
  .get('/image', file('banner.png'))
  .get('/stream', function* () {
    yield 'Hello '
    yield 'World'
  })
  .ws('/chat', {
    message(ws, msg) {
      ws.send("You said: " + msg)
    }
  })
  .listen(3000)

No setup chaos. Just return values — Elysia does the heavy lifting.

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Type Safety Without Pain

Elysia treats your schema and types as the single source of truth. Write it once, and Elysia uses it for validation, TypeScript inference, and OpenAPI docs.

import { Elysia, t } from 'elysia'

new Elysia()
  .post('/user', ({ body }) => body, {
    body: t.Object({
      name: t.String(),
      age: t.Number()
    })
  })

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Client and Server, Finally in Sync

With @elysiajs/eden, your frontend knows exactly what your backend expects. No mismatched types.

import { treaty } from '@elysiajs/eden'
import type { App } from './server'

const api = treaty('http://localhost:3000')
await api.user.post({ name: "Amandeep", age: 21 })

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Performance That Speaks for Itself

Because Elysia runs on Bun, it's extremely fast. Benchmarks show it outperforming:

• Express
• Fastify

Perfect for high-traffic APIs, SaaS products, and real-time systems.

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Who Should Use ElysiaJS?

• Developers who want Bun-level performance
• People who care about type safety
• Teams tired of redundant schemas and configs
• Anyone building modern APIs

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Conclusion

ElysiaJS isn’t just another backend framework — it's a new way to think about server development. It’s fast, elegant, and genuinely fun to use.

If you're building APIs today and want to stay ahead, ElysiaJS is worth exploring.

Official Website: https://elysiajs.com

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