ElysiaJSElysia is fast
18x faster than Express
Supercharged by Bun runtime, Static Code Analysis, and various micro optimization.
Elysia is able to outperform in various situations, being one of the top-performing TypeScript frameworks.
Elysia Bun
276,322Hono Bun
254,376Baojs Bun
173,587Fast Deno
85,924Fastify Node
58,742Koa Node
37,198Express Node
15,133Nest Node
13,510
Measure in requests/second. Benchmark for parsing query, path parameter and set response header on Debian 11, Intel i7-13700K tested on Bun 0.7.2 at 6 Aug 2023. See the benchmark condition here
Made for Humans
Focus on productivity ++
If you found yourself writing code for the framework, then there's something wrong with the framework.
That's why Elysia invests time to experiment with design decisions to craft the most ergonomic way possible for everyone
From built-in strict-type validation to a unified type system, and documentation generation, making an ideal framework for building servers with TypeScript.
import { Elysia } from 'elysia'
new Elysia()
.get('/', () => 'Hello World')
.get('/json', () => ({
hello: 'world'
}))
.listen(3000)Just return
No need for an additional method, just return the value to send data back to the client.
Whether it's a regular string, or complex JSON, just return the value and Elysia will handle the rest
import { Elysia, t } from 'elysia'
new Elysia()
.post(
'/profile',
({ body }) => body,
{
body: t.Object({
username: t.String()
})
}
)
.listen(3000)
Type Strict
Powered by TypeBox, Elysia enforces type-strict validation to ensure type integrity by default
Elysia infers types to TypeScript automatically to create unified type system like statically typed language
import { Elysia, t } from 'elysia'
import { swagger } from '@elysiajs/swagger'
import { users, feed } from './controllers'
new Elysia()
.use(swagger())
.use(users)
.use(feed)
.listen(3000)OpenAPI Compliance
Elysia generates OpenAPI 3.0 specs automatically to integrate with various tools across multiple languages
Thanks to OpenAPI compliance, Elysia can generate Swagger in one line with the Swagger plugin.
Introducing
End–to-End Type Safety
Synchronize types across all applications.
Move fast and break nothing like tRPC.
// server.ts
import { Elysia, t } from 'elysia'
const app = new Elysia()
.patch(
'/user/age',
({ body }) => signIn(body),
{
body: t.Object({
name: t.String(),
age: t.Number()
})
}
)
.listen(80)
export type App = typeof app// client.ts
import { edenTreaty } from '@elysiajs/eden'
import type { App } from 'server'
const eden = edenTreaty<App>('http://localhost')
await eden.user.age.patch({
name: 'saltyaom',
age: '21'
})Type 'string' is not assignable to type 'number'
It works with that
Being one of the most popular choices for a Bun web framework, likely there is a plugin for what you want.
If the plugin you need is not there, it's easy to create one and share it with the community.
Try it out
Being WinterCG compliant, Elysia can run in your browser!
Edit the code and see live update immediately.
Can't find what you're looking for?
Join the community
Elysia is one of the biggest communities for Bun first web frameworks.
You can ask your questions / propose a new feature / file a bug with our community and mainters.
Start in minutes
Scaffold your project, and run server in no time
bun create elysia app