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Integration with Node.js ​

Elysia provides a runtime adapter to run Elysia on multiple runtimes, including Node.js.

To run Elysia on Node.js, simply install Node adapter.

bash
bun add elysia @elysiajs/node
bash
pnpm add elysia @elysiajs/node
bash
npm install elysia @elysiajs/node
bash
yarn add elysia @elysiajs/node

Then apply the Node adapter to your main Elysia instance.

typescript
import { Elysia } from 'elysia'
import { node } from '@elysiajs/node'

const app = new Elysia({ adapter: node() }) 
	.get('/', () => 'Hello Elysia')
	.listen(3000)

This is all you need to run Elysia on Node.js.

Additional Setup (optional) ​

For the best experience, we recommend installing tsx or ts-node with nodemon.

tsx is a CLI that transpiles TypeScript to JavaScript with hot-reload and several more features you would expect from a modern development environment.

bash
bun add -d tsx @types/node typescript
bash
pnpm add -D tsx @types/node typescript
bash
npm install --save-dev tsx @types/node typescript
bash
yarn add -D tsx @types/node typescript

Then open your package.json file and add the following scripts:

json
{
   	"scripts": {
  		"dev": "tsx watch src/index.ts",
    	"build": "tsc src/index.ts --outDir dist",
  		"start": "NODE_ENV=production node dist/index.js"
   	}
}

These scripts refer to the different stages of developing an application:

  • dev - Start Elysia in development mode with auto-reload on code changes.
  • build - Build the application for production use.
  • start - Start a production Elysia server.

Make sure to create a tsconfig.json:

bash
tsc --init

Don't forget to update tsconfig.json to set compilerOptions.strict to true:

json
{
   	"compilerOptions": {
  		"strict": true
   	}
}

This will give the hot reload, JSX support to run Elysia with the similar experience as bun dev

pnpm ​

If you use pnpm, pnpm doesn't auto install peer dependencies by default forcing you to install additional dependencies manually.

bash
pnpm add @sinclair/typebox openapi-types