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agent/.agent/skills/tech-stack/elysiajs/integrations/nextjs.md

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# Next.js Integration
## What It Is
Run Elysia on Next.js App Router.
## Setup
1. Create `app/api/[[...slugs]]/route.ts`
2. Define Elysia + export handlers:
```typescript
// app/api/[[...slugs]]/route.ts
import { Elysia, t } from 'elysia'
const app = new Elysia({ prefix: '/api' })
.get('/', 'Hello Nextjs')
.post('/', ({ body }) => body, {
body: t.Object({ name: t.String() })
})
export const GET = app.fetch
export const POST = app.fetch
```
WinterCG compliance - works as normal Next.js API route.
## Prefix for Non-Root
If placed in `app/user/[[...slugs]]/route.ts`, set prefix:
```typescript
const app = new Elysia({ prefix: '/user' })
.get('/', 'Hello Nextjs')
export const GET = app.fetch
export const POST = app.fetch
```
## Eden (End-to-End Type Safety)
Isomorphic fetch pattern:
- Server: Direct calls (no network)
- Client: Network calls
1. Export type:
```typescript
// app/api/[[...slugs]]/route.ts
export const app = new Elysia({ prefix: '/api' })
.get('/', 'Hello Nextjs')
.post('/user', ({ body }) => body, {
body: treaty.schema('User', { name: 'string' })
})
export type app = typeof app
export const GET = app.fetch
export const POST = app.fetch
```
2. Create client:
```typescript
// lib/eden.ts
import { treaty } from '@elysiajs/eden'
import type { app } from '../app/api/[[...slugs]]/route'
export const api =
typeof process !== 'undefined'
? treaty(app).api
: treaty<typeof app>('localhost:3000').api
```
Use `typeof process` not `typeof window` (window undefined at build time → hydration error).
3. Use in components:
```tsx
// app/page.tsx
import { api } from '../lib/eden'
export default async function Page() {
const message = await api.get()
return <h1>Hello, {message}</h1>
}
```
Works with server/client components + ISR.
## React Query
```tsx
import { useQuery } from '@tanstack/react-query'
function App() {
const { data: response } = useQuery({
queryKey: ['get'],
queryFn: () => getTreaty().get()
})
return response?.data
}
```
Works with all React Query features.
## pnpm
Manual install:
```bash
pnpm add @sinclair/typebox openapi-types
```