---
name: next-js-16-launchpad-0b508f5c9316
description: Next.js 16 with Turbopack, Cache Components, and proxy.ts. Use for bootstrapping, migrating, and building with App Router and React 19.
version: 1.1.0
trigger_keywords:
  - "next.js 16"
  - "turbopack"
  - "cache components"
  - "proxy.ts"
license: MIT
---

# Next.js 16 Launchpad

Next.js 16: Turbopack default (2-5× faster builds), Cache Components (`'use cache'`), and `proxy.ts` for explicit control.

## When to Use

✅ Next.js 16, Turbopack, Cache Components, proxy migration, App Router, React 19.2

❌ Pages Router, Next.js ≤15, generic React questions

## Requirements

| Tool | Version |
|------|---------|
| Node.js | 20.9.0+ |
| TypeScript | 5.1.0+ |
| React | 19.2+ |

## Quick Start

```bash
# New project
npx create-next-app@latest my-app

# Upgrade existing
npx @next/codemod@canary upgrade latest
npm install next@latest react@latest react-dom@latest
```

Recommended: TypeScript, ESLint, Tailwind, App Router, Turbopack, `@/*` alias.

### Minimal Setup

```tsx
// app/layout.tsx
export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>{children}</body>
    </html>
  )
}
```

```tsx
// app/page.tsx
export default function Page() {
  return <h1>Hello, Next.js 16!</h1>
}
```

## Configuration

```ts
// next.config.ts
import type { NextConfig } from 'next'

const nextConfig: NextConfig = {
  cacheComponents: true,
  reactCompiler: true,
}

export default nextConfig
```

### v15 → v16 Changes

| v15 | v16 |
|-----|-----|
| `experimental.turbopack` | Default |
| `experimental.ppr` | `cacheComponents` |
| `middleware.ts` (Edge) | `proxy.ts` (Node) |
| Sync `params` | `await params` |

## Core Patterns

### 1. Server Components (Default)

```tsx
export default async function BlogPage() {
  const res = await fetch('https://api.example.com/posts')
  const posts = await res.json()
  return <PostList posts={posts} />
}
```

### 2. Cache Components

```tsx
import { cacheLife } from 'next/cache'

export default async function BlogPage() {
  'use cache'
  cacheLife('hours')
  const posts = await fetch('https://api.example.com/posts').then(r => r.json())
  return <PostList posts={posts} />
}
```

### 3. Client Components

```tsx
'use client'
import { useState } from 'react'

export default function Counter() {
  const [count, setCount] = useState(0)
  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>+</button>
    </div>
  )
}
```

### 4. Proxy Boundary

```ts
// app/proxy.ts
export function proxy(request: NextRequest) {
  if (!request.cookies.get('auth') && request.nextUrl.pathname.startsWith('/dashboard')) {
    return NextResponse.redirect(new URL('/login', request.url))
  }
  return NextResponse.next()
}
```

### 5. Cache Tags + Server Actions

```tsx
// app/blog/page.tsx
'use cache'
cacheLife('hours')
cacheTag('blog-posts')

export default async function BlogList() {
  const posts = await db.posts.findMany()
  return <PostList posts={posts} />
}
```

```ts
// app/actions.ts
'use server'
import { updateTag } from 'next/cache'

export async function createPost(data: PostData) {
  await db.posts.create(data)
  updateTag('blog-posts')
}
```

### 6. Streaming with Suspense

```tsx
export default function Dashboard() {
  return (
    <div>
      <Suspense fallback={<Skeleton />}>
        <RevenueCard />
      </Suspense>
      <Suspense fallback={<Skeleton />}>
        <UsersCard />
      </Suspense>
    </div>
  )
}

async function RevenueCard() {
  const data = await db.analytics.revenue()
  return <div>{data}</div>
}
```

## Key Concepts

1. **Turbopack** - Rust bundler, incremental compilation, Fast Refresh
2. **Server Components** - Default in `app/`, zero client JS
3. **Client Components** - `'use client'`, hooks, browser APIs
4. **Cache Components** - `'use cache'` + `cacheLife()` for PPR
5. **Proxy Boundary** - `proxy.ts` for auth/rewrites/redirects
6. **Partial Pre-Rendering** - Static shell + dynamic streaming

## Migration Checklist

1. **Async Request APIs**
   ```bash
   npx @next/codemod@canary async-request-api
   ```
   Update: `const { slug } = await params`

2. **middleware.ts → proxy.ts**
   - Rename file, export `proxy`
   - Node runtime only (not Edge)

3. **Config updates**
   - Remove `experimental.*` flags
   - Enable `cacheComponents`, `reactCompiler`
   - Remove `serverRuntimeConfig`/`publicRuntimeConfig`

4. **Cache Components**
   - Replace `experimental.ppr` with `cacheComponents: true`
   - Wrap dynamic sections with `<Suspense>`

5. **Images**
   - Configure `images.localPatterns` for query strings

See `references/nextjs16-migration-playbook.md` for complete guide.

## Common Pitfalls

❌ Mixing `'use cache'` with runtime APIs (`cookies()`, `headers()`)
❌ Missing `<Suspense>` when Cache Components enabled
❌ Tilde Sass imports under Turbopack
❌ Running `proxy.ts` on Edge runtime

✅ Read cookies/headers first, pass as props to cached components
✅ Wrap dynamic children in `<Suspense>`
✅ Use standard Sass imports
✅ Use Node runtime for proxy

## Decision Guide

**Enable Cache Components?** 
→ Yes for static/semi-static content
→ No for fully dynamic dashboards

**Where does auth live?**
→ `proxy.ts` for cross-route checks
→ Route handlers for API-specific logic

**When to use `'use client'`?**
→ Only when you need hooks, state, or browser APIs
→ Keep presentational components server-side

## Production Patterns

### E-commerce
```tsx
// Product page with streaming
export default async function Product({ params }) {
  const { id } = await params
  const product = await db.products.findById(id)
  
  return (
    <>
      <ProductInfo product={product} />
      <Suspense fallback={<ReviewsSkeleton />}>
        <Reviews productId={id} />
      </Suspense>
    </>
  )
}
```

### Authenticated Dashboard
```ts
// proxy.ts
export function proxy(request: NextRequest) {
  const session = request.cookies.get('session')
  if (!session && request.nextUrl.pathname.startsWith('/dashboard')) {
    return NextResponse.redirect(new URL('/login', request.url))
  }
}
```

See `references/nextjs16-advanced-patterns.md` for more blueprints.

## Performance

- Keep Turbopack enabled (opt-out with `--webpack` only if needed)
- Parallelize fetches with `Promise.all`
- Use `<Suspense>` for streaming boundaries
- Enable file system cache for large repos

## Security

- Use `server-only` package + React Taint API
- Keep auth in `proxy.ts`
- Validate inputs in Server Actions
- Gate env vars with `NEXT_PUBLIC_` prefix
- Extract cookies/headers before cached scopes

## Deployment

- Vercel: Zero-config
- Docker/Node: `output: 'standalone'`
- Monitor build times (2-5× speedup expected)
- Configure cache lifecycles to match CDN

## Reference Files

- **references/nextjs16-reference.md** - Install/config/checklists
- **references/nextjs16-migration-playbook.md** - Migration guide with codemods
- **references/nextjs16-advanced-patterns.md** - Streaming, caching, auth patterns
- **references/NEXTJS_16_COMPLETE_GUIDE.md** - Complete documentation
- **scripts/bootstrap-nextjs16.ps1** - Automated setup script
- **assets/app-router-starter/** - Reference implementation

## Resources

- Docs: https://nextjs.org/docs
- GitHub: https://github.com/vercel/next.js

**Version:** 1.1.0 | **Updated:** 2025-12-27


---
Source attribution: aiskillstore
Original project: https://github.com/aiskillstore/marketplace/blob/21f00171ad7bf4c1ec5f6f59bf32ca58fe7dbb68/skills/calel33/next-js-16-launchpad/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: aiskillstore
Original project: https://github.com/aiskillstore/marketplace/blob/21f00171ad7bf4c1ec5f6f59bf32ca58fe7dbb68/skills/calel33/next-js-16-launchpad/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Product Management
Roles: Frontend Developer, Full-Stack Developer, Product Manager
Specialties: Frontend, Backend
Tools: Next.Js, Typescript, React
Country applicability: Country not specified
Classification basis: Source category, role and specialization labels
Instruction SHA-256: 866eeee7940fcce910c0e17da8cd64441196877bf5a03c83b4f4d87882a381dd