Use Elysia in the AWS Lambda function
npm install elysia-awslambdaUse Elysia in AWS Lambda functions with API Gateway v2.
- Convert API Gateway v2 events to Web Request
- Convert Elysia responses to API Gateway v2 format
- Full support for query strings, path parameters, and headers
- Automatic base64 encoding for binary responses
- TypeScript support
``bash`
npm install elysia-awslambda
or using yarn
`bash`
yarn add elysia-awslambda
or using pnpm
`bash`
pnpm add elysia-awslambda
or using bun
`bash`
bun add elysia-awslambda
`typescript
import { Elysia } from 'elysia'
import { handle } from 'elysia-awslambda'
const app = new Elysia()
app.get('/', (c) => {
return c.status(200, { message: 'Hello, world!' })
})
export default handle(app)
`
`typescript
import { Elysia, Context } from 'elysia'
import { handle } from 'elysia-awslambda'
const app = new Elysia()
app.get('/:token', (c: Context) => {
if (!c.params.token) {
return c.status(400, { message: 'Token is required' })
}
return c.status(200, {
message: 'Token found',
token: c.params.token
})
})
export default handle(app)
`
`typescript
import { Elysia } from 'elysia'
import { handle } from 'elysia-awslambda'
const app = new Elysia()
app.onError(({ error, code }) => {
return {
message: 'Something went wrong!',
error,
}
})
app.get('/', () => {
throw new Error('Intentional error')
})
export default handle(app)
`
The library works seamlessly with serverless-bun-plugin for deploying Elysia apps to AWS Lambda.
`
project/
├── accounts/
│ ├── handler.ts
│ └── router.ts
├── package.json
├── serverless.yml
└── tsconfig.json
`yaml
frameworkVersion: '>= 3 < 4'
service: elysia-awslambda
provider:
name: aws
architecture: arm64
stage: staging
region: us-east-1
custom:
bun:
version: 1.3.4
package:
individually: true
patterns:
- '!node_modules/**'
functions:
accounts:
handler: accounts/handler.default
runtime: bun:1.x
memorySize: 256
timeout: 30
architecture: arm64
url: true
plugins:
- serverless-bun-plugin
`
`typescript
import { Elysia, Context } from 'elysia'
import { handle } from 'elysia-awslambda'
export const app = new Elysia()
app.get('/', async (c: Context) => {
return c.status(200, { message: 'Hello, world!' })
})
app.get('/:token', async (c: Context) => {
if (!c.params.token) {
return c.status(400, { message: 'Token is required' })
}
return c.status(200, { message: 'Token found', token: c.params.token })
})
app.onError(({ error, code }) => {
return {
message: 'Something went wrong!',
error,
}
})
export default handle(app)
`
`typescript
import Router from '@/accounts/router'
export default async function main(event: any, context: any) {
const response = await Router(event, context)
return response
}
`
`json`
{
"compilerOptions": {
"target": "ES2022",
"module": "ESNext",
"moduleResolution": "bundler",
"lib": ["ES2022"],
"types": ["bun-types"],
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true,
"paths": {
"@/": ["./"]
}
}
}
The handle function wraps your Elysia app and provides the necessary transformation layer between AWS Lambda and Elysia:
1. Request Transformation: Converts API Gateway v2 events to standard Web Request objects
- Extracts HTTP method, path, query strings, and headers
- Handles base64 encoded request bodies
- Constructs proper URL with protocol and host
2. Response Transformation: Converts Elysia Response objects to API Gateway v2 format
- Extracts status code and headers
- Handles text and binary responses
- Automatically encodes binary data as base64
3. Native Elysia Support: Use all Elysia features
- Path parameters and query strings
- Middleware and plugins
- Error handling
- Type safety with TypeScript
Wraps an Elysia app and returns an AWS Lambda handler function.
Parameters:
- app: An Elysia app instance
Returns:
- AWS Lambda handler function with signature (event: APIGatewayProxyEventV2, context: Context) => Promise
- Bun runtime
- Elysia v1.4+
- AWS Lambda with API Gateway v2
See the example directory for a complete working implementation.
MIT License
Copyright (c) 2025 Thadeu
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