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Nextjs Development

manutej/luxor-claude-marketplace

  • 335 installs
  • 61 repo stars
  • Updated June 13, 2026
  • manutej/luxor-claude-marketplace

Build Next.js App Router pages, layouts, server components, data fetching, metadata, and API routes following framework conventions and performance best practices.

About

Covers Next.js development with App Router conventions, React Server Components, layouts, server actions, async data fetching, metadata, image and font optimization, error boundaries, and API route patterns for production SaaS and content sites.

  • App Router file conventions and layouts
  • RSC vs client component boundaries
  • Server actions and async data patterns
  • Metadata, images, and font optimization
  • Error handling and route handler APIs

Nextjs Development by the numbers

  • 335 all-time installs (skills.sh)
  • +20 installs in the week ending Aug 2, 2026 (Skillselion tracking)
  • Ranked #712 of 2,245 Frontend Development skills by installs in the Skillselion catalog
  • Data as of Aug 4, 2026 (Skillselion catalog sync)
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Installs335
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Last updatedJune 13, 2026
Repositorymanutej/luxor-claude-marketplace ↗

What it does

Build Next.js App Router pages, layouts, server components, data fetching, metadata, and API routes following framework conventions and performance best practices.

Files

SKILL.mdMarkdownGitHub ↗

Next.js Development Skill

This skill provides comprehensive guidance for building modern Next.js applications using the App Router, Server Components, data fetching patterns, routing, API routes, middleware, and full-stack development techniques based on official Next.js documentation.

When to Use This Skill

Use this skill when:

  • Building full-stack React applications with server-side rendering (SSR)
  • Creating static sites with incremental static regeneration (ISR)
  • Developing modern web applications with React Server Components
  • Building API backends with serverless route handlers
  • Implementing SEO-optimized applications with metadata and Open Graph
  • Creating production-ready web applications with built-in optimization
  • Building e-commerce, blogs, dashboards, or content-driven sites
  • Implementing authentication, data fetching, and complex routing patterns
  • Optimizing images, fonts, and performance automatically
  • Deploying serverless applications with edge computing capabilities

Core Concepts

App Router

The App Router is Next.js's modern routing system built on React Server Components. It uses the app directory for file-based routing with enhanced features.

Basic App Structure:

app/
├── layout.tsx          # Root layout (required)
├── page.tsx            # Home page
├── loading.tsx         # Loading UI
├── error.tsx           # Error UI
├── not-found.tsx       # 404 page
├── about/
│   └── page.tsx        # /about route
└── blog/
    ├── page.tsx        # /blog route
    ├── [slug]/
    │   └── page.tsx    # /blog/[slug] dynamic route
    └── layout.tsx      # Blog layout

Root Layout (Required):

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

Page Component:

// app/page.tsx
export default function HomePage() {
  return (
    <main>
      <h1>Welcome to Next.js</h1>
      <p>Building modern web applications</p>
    </main>
  )
}

Server Components

Server Components are React components that render on the server. They are the default in the App Router and provide better performance.

Server Component (Default):

// app/posts/page.tsx
async function getPosts() {
  const res = await fetch('https://api.example.com/posts', {
    cache: 'force-cache' // Static generation
  })
  return res.json()
}

export default async function PostsPage() {
  const posts = await getPosts()

  return (
    <div>
      <h1>Blog Posts</h1>
      {posts.map((post) => (
        <article key={post.id}>
          <h2>{post.title}</h2>
          <p>{post.excerpt}</p>
        </article>
      ))}
    </div>
  )
}

Client Component (When Needed):

'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)}>
        Increment
      </button>
    </div>
  )
}

Mixing Server and Client Components:

// app/dashboard/page.tsx (Server Component)
import ClientCounter from './ClientCounter'

async function getData() {
  const res = await fetch('https://api.example.com/data')
  return res.json()
}

export default async function DashboardPage() {
  const data = await getData()

  return (
    <div>
      <h1>Dashboard</h1>
      <p>Server data: {data.value}</p>
      {/* Client component for interactivity */}
      <ClientCounter />
    </div>
  )
}

Data Fetching

Next.js extends the native fetch() API with automatic caching and revalidation.

Static Data Fetching (Default):

async function getStaticData() {
  const res = await fetch('https://api.example.com/data', {
    cache: 'force-cache' // Default, equivalent to getStaticProps
  })
  return res.json()
}

export default async function Page() {
  const data = await getStaticData()
  return <div>{data.title}</div>
}

Dynamic Data Fetching:

async function getDynamicData() {
  const res = await fetch('https://api.example.com/data', {
    cache: 'no-store' // Equivalent to getServerSideProps
  })
  return res.json()
}

export default async function Page() {
  const data = await getDynamicData()
  return <div>{data.title}</div>
}

Revalidation (ISR):

async function getRevalidatedData() {
  const res = await fetch('https://api.example.com/data', {
    next: { revalidate: 60 } // Revalidate every 60 seconds
  })
  return res.json()
}

export default async function Page() {
  const data = await getRevalidatedData()
  return <div>{data.title}</div>
}

Parallel Data Fetching:

async function getUser(id: string) {
  const res = await fetch(`https://api.example.com/users/${id}`)
  return res.json()
}

async function getUserPosts(id: string) {
  const res = await fetch(`https://api.example.com/users/${id}/posts`)
  return res.json()
}

export default async function UserPage({ params }: { params: { id: string } }) {
  // Fetch in parallel
  const [user, posts] = await Promise.all([
    getUser(params.id),
    getUserPosts(params.id)
  ])

  return (
    <div>
      <h1>{user.name}</h1>
      <ul>
        {posts.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
    </div>
  )
}

Sequential Data Fetching:

async function getUser(id: string) {
  const res = await fetch(`https://api.example.com/users/${id}`)
  return res.json()
}

async function getRecommendations(preferences: string[]) {
  const res = await fetch('https://api.example.com/recommendations', {
    method: 'POST',
    body: JSON.stringify({ preferences })
  })
  return res.json()
}

export default async function UserPage({ params }: { params: { id: string } }) {
  // First fetch user
  const user = await getUser(params.id)

  // Then fetch recommendations based on user data
  const recommendations = await getRecommendations(user.preferences)

  return (
    <div>
      <h1>{user.name}</h1>
      <h2>Recommendations</h2>
      <ul>
        {recommendations.map((item) => (
          <li key={item.id}>{item.title}</li>
        ))}
      </ul>
    </div>
  )
}

Routing

Next.js uses file-system based routing in the app directory.

Dynamic Routes:

// app/blog/[slug]/page.tsx
export default function BlogPost({ params }: { params: { slug: string } }) {
  return <h1>Post: {params.slug}</h1>
}

// Generates static pages for these slugs at build time
export async function generateStaticParams() {
  const posts = await fetch('https://api.example.com/posts').then(r => r.json())

  return posts.map((post) => ({
    slug: post.slug,
  }))
}

Catch-All Routes:

// app/docs/[...slug]/page.tsx
export default function DocsPage({ params }: { params: { slug: string[] } }) {
  // /docs/a/b/c -> params.slug = ['a', 'b', 'c']
  return <h1>Docs: {params.slug.join('/')}</h1>
}

Optional Catch-All Routes:

// app/shop/[[...slug]]/page.tsx
export default function ShopPage({ params }: { params: { slug?: string[] } }) {
  // /shop -> params.slug = undefined
  // /shop/clothes -> params.slug = ['clothes']
  // /shop/clothes/tops -> params.slug = ['clothes', 'tops']
  return <h1>Shop: {params.slug?.join('/') || 'All'}</h1>
}

Route Groups:

app/
├── (marketing)/          # Route group (not in URL)
│   ├── about/
│   │   └── page.tsx      # /about
│   └── contact/
│       └── page.tsx      # /contact
└── (shop)/
    ├── products/
    │   └── page.tsx      # /products
    └── cart/
        └── page.tsx      # /cart

Parallel Routes:

app/
├── @analytics/
│   └── page.tsx
├── @team/
│   └── page.tsx
└── layout.tsx

// app/layout.tsx
export default function Layout({
  children,
  analytics,
  team,
}: {
  children: React.ReactNode
  analytics: React.ReactNode
  team: React.ReactNode
}) {
  return (
    <>
      {children}
      {analytics}
      {team}
    </>
  )
}

Intercepting Routes:

app/
├── feed/
│   └── page.tsx
├── photo/
│   └── [id]/
│       └── page.tsx
└── @modal/
    └── (.)photo/
        └── [id]/
            └── page.tsx  # Intercepts /photo/[id] when navigating from /feed

Layouts

Layouts wrap pages and preserve state across navigation.

Nested Layouts:

// app/layout.tsx (Root Layout)
export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <header>
          <nav>Global Navigation</nav>
        </header>
        {children}
        <footer>Global Footer</footer>
      </body>
    </html>
  )
}

// app/dashboard/layout.tsx (Dashboard Layout)
export default function DashboardLayout({ children }: { children: React.ReactNode }) {
  return (
    <div className="dashboard">
      <aside>Dashboard Sidebar</aside>
      <main>{children}</main>
    </div>
  )
}

// app/dashboard/page.tsx
export default function DashboardPage() {
  return <h1>Dashboard</h1>
}

Templates (Re-render on Navigation):

// app/template.tsx
export default function Template({ children }: { children: React.ReactNode }) {
  return (
    <div>
      {/* This creates a new instance on each navigation */}
      {children}
    </div>
  )
}

Loading UI

Special loading.tsx files create loading states with React Suspense.

Loading State:

// app/dashboard/loading.tsx
export default function Loading() {
  return (
    <div className="spinner">
      <p>Loading dashboard...</p>
    </div>
  )
}

// app/dashboard/page.tsx
async function getData() {
  const res = await fetch('https://api.example.com/data')
  return res.json()
}

export default async function DashboardPage() {
  const data = await getData()
  return <div>{data.content}</div>
}

Streaming with Suspense:

// app/page.tsx
import { Suspense } from 'react'

async function SlowComponent() {
  await new Promise(resolve => setTimeout(resolve, 3000))
  return <div>Slow data loaded</div>
}

export default function Page() {
  return (
    <div>
      <h1>Page</h1>
      <Suspense fallback={<div>Loading slow component...</div>}>
        <SlowComponent />
      </Suspense>
    </div>
  )
}

Error Handling

Special error.tsx files handle errors with error boundaries.

Error Boundary:

// app/error.tsx
'use client' // Error components must be Client Components

export default function Error({
  error,
  reset,
}: {
  error: Error & { digest?: string }
  reset: () => void
}) {
  return (
    <div>
      <h2>Something went wrong!</h2>
      <p>{error.message}</p>
      <button onClick={() => reset()}>Try again</button>
    </div>
  )
}

Global Error:

// app/global-error.tsx
'use client'

export default function GlobalError({
  error,
  reset,
}: {
  error: Error & { digest?: string }
  reset: () => void
}) {
  return (
    <html>
      <body>
        <h2>Application Error</h2>
        <button onClick={() => reset()}>Try again</button>
      </body>
    </html>
  )
}

Not Found:

// app/not-found.tsx
import Link from 'next/link'

export default function NotFound() {
  return (
    <div>
      <h2>Page Not Found</h2>
      <p>Could not find the requested resource</p>
      <Link href="/">Return Home</Link>
    </div>
  )
}

API Routes

Route Handlers allow you to create API endpoints using Web Request and Response APIs.

Basic API Route:

// app/api/hello/route.ts
export async function GET(request: Request) {
  return Response.json({ message: 'Hello from Next.js!' })
}

Dynamic Route Handler:

// app/api/posts/[id]/route.ts
export async function GET(
  request: Request,
  { params }: { params: { id: string } }
) {
  const id = params.id
  const post = await db.post.findUnique({ where: { id } })

  if (!post) {
    return new Response('Post not found', { status: 404 })
  }

  return Response.json(post)
}

export async function DELETE(
  request: Request,
  { params }: { params: { id: string } }
) {
  await db.post.delete({ where: { id: params.id } })
  return new Response(null, { status: 204 })
}

POST Request with Body:

// app/api/posts/route.ts
export async function POST(request: Request) {
  const body = await request.json()

  const post = await db.post.create({
    data: {
      title: body.title,
      content: body.content,
    }
  })

  return Response.json(post, { status: 201 })
}

Request with Headers:

// app/api/protected/route.ts
export async function GET(request: Request) {
  const token = request.headers.get('authorization')

  if (!token) {
    return new Response('Unauthorized', { status: 401 })
  }

  const user = await verifyToken(token)
  return Response.json({ user })
}

Search Params:

// app/api/search/route.ts
export async function GET(request: Request) {
  const { searchParams } = new URL(request.url)
  const query = searchParams.get('q')
  const page = searchParams.get('page') || '1'

  const results = await search(query, parseInt(page))

  return Response.json(results)
}

CORS Headers:

// app/api/public/route.ts
export async function GET(request: Request) {
  const data = { message: 'Public API' }

  return Response.json(data, {
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type, Authorization',
    },
  })
}

export async function OPTIONS(request: Request) {
  return new Response(null, {
    status: 204,
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type, Authorization',
    },
  })
}

Middleware

Middleware runs before a request is completed, allowing you to modify the response.

Basic Middleware:

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export function middleware(request: NextRequest) {
  // Clone the request headers
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('x-custom-header', 'custom-value')

  // Return response with modified headers
  return NextResponse.next({
    request: {
      headers: requestHeaders,
    },
  })
}

export const config = {
  matcher: '/api/:path*',
}

Authentication Middleware:

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export function middleware(request: NextRequest) {
  const token = request.cookies.get('token')?.value

  // Redirect to login if no token
  if (!token && request.nextUrl.pathname.startsWith('/dashboard')) {
    return NextResponse.redirect(new URL('/login', request.url))
  }

  // Redirect to dashboard if already logged in
  if (token && request.nextUrl.pathname === '/login') {
    return NextResponse.redirect(new URL('/dashboard', request.url))
  }

  return NextResponse.next()
}

export const config = {
  matcher: ['/dashboard/:path*', '/login'],
}

Geolocation and Rewrites:

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export function middleware(request: NextRequest) {
  const country = request.geo?.country || 'US'

  // Rewrite based on country
  if (country === 'GB') {
    return NextResponse.rewrite(new URL('/gb' + request.nextUrl.pathname, request.url))
  }

  return NextResponse.next()
}

Rate Limiting:

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'
import { Ratelimit } from '@upstash/ratelimit'
import { Redis } from '@upstash/redis'

const ratelimit = new Ratelimit({
  redis: Redis.fromEnv(),
  limiter: Ratelimit.slidingWindow(10, '10 s'),
})

export async function middleware(request: NextRequest) {
  const ip = request.ip ?? '127.0.0.1'
  const { success } = await ratelimit.limit(ip)

  if (!success) {
    return new Response('Too Many Requests', { status: 429 })
  }

  return NextResponse.next()
}

export const config = {
  matcher: '/api/:path*',
}

Metadata and SEO

Next.js provides a Metadata API for defining page metadata.

Static Metadata:

// app/about/page.tsx
import type { Metadata } from 'next'

export const metadata: Metadata = {
  title: 'About Us',
  description: 'Learn more about our company',
  openGraph: {
    title: 'About Us',
    description: 'Learn more about our company',
    images: ['/og-image.jpg'],
  },
  twitter: {
    card: 'summary_large_image',
  },
}

export default function AboutPage() {
  return <h1>About Us</h1>
}

Dynamic Metadata:

// app/blog/[slug]/page.tsx
import type { Metadata } from 'next'

type Props = {
  params: { slug: string }
}

export async function generateMetadata({ params }: Props): Promise<Metadata> {
  const post = await getPost(params.slug)

  return {
    title: post.title,
    description: post.excerpt,
    openGraph: {
      title: post.title,
      description: post.excerpt,
      images: [post.coverImage],
      type: 'article',
      publishedTime: post.publishedAt,
    },
  }
}

export default async function BlogPost({ params }: Props) {
  const post = await getPost(params.slug)
  return <article>{post.content}</article>
}

Metadata with Icons:

// app/layout.tsx
import type { Metadata } from 'next'

export const metadata: Metadata = {
  title: {
    default: 'My App',
    template: '%s | My App',
  },
  description: 'My application description',
  icons: {
    icon: '/favicon.ico',
    apple: '/apple-icon.png',
  },
  manifest: '/manifest.json',
}

Image Optimization

Next.js automatically optimizes images with the Image component.

Basic Image:

import Image from 'next/image'

export default function Page() {
  return (
    <Image
      src="/profile.jpg"
      alt="Profile picture"
      width={500}
      height={500}
    />
  )
}

Remote Images:

// next.config.js
module.exports = {
  images: {
    remotePatterns: [
      {
        protocol: 'https',
        hostname: 'images.unsplash.com',
      },
    ],
  },
}

// Component
import Image from 'next/image'

export default function Page() {
  return (
    <Image
      src="https://images.unsplash.com/photo-1234567890"
      alt="Photo"
      width={800}
      height={600}
      priority // Load image with high priority
    />
  )
}

Fill Container:

import Image from 'next/image'

export default function Page() {
  return (
    <div style={{ position: 'relative', width: '100%', height: '400px' }}>
      <Image
        src="/background.jpg"
        alt="Background"
        fill
        style={{ objectFit: 'cover' }}
      />
    </div>
  )
}

Responsive Images:

import Image from 'next/image'

export default function Page() {
  return (
    <Image
      src="/hero.jpg"
      alt="Hero"
      width={1920}
      height={1080}
      sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw"
    />
  )
}

Font Optimization

Next.js automatically optimizes fonts with next/font.

Google Fonts:

// app/layout.tsx
import { Inter, Roboto_Mono } from 'next/font/google'

const inter = Inter({
  subsets: ['latin'],
  display: 'swap',
})

const robotoMono = Roboto_Mono({
  subsets: ['latin'],
  display: 'swap',
  variable: '--font-roboto-mono',
})

export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en" className={`${inter.className} ${robotoMono.variable}`}>
      <body>{children}</body>
    </html>
  )
}

Local Fonts:

// app/layout.tsx
import localFont from 'next/font/local'

const myFont = localFont({
  src: './fonts/my-font.woff2',
  display: 'swap',
  variable: '--font-my-font',
})

export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en" className={myFont.variable}>
      <body>{children}</body>
    </html>
  )
}

Workflow Patterns

Creating a New Page

1. Create a new folder in app directory 2. Add a page.tsx file 3. Export a default component 4. Optionally add layout, loading, and error files

// app/products/page.tsx
export default function ProductsPage() {
  return <h1>Products</h1>
}

// app/products/layout.tsx
export default function ProductsLayout({ children }: { children: React.ReactNode }) {
  return (
    <div>
      <nav>Products Navigation</nav>
      {children}
    </div>
  )
}

// app/products/loading.tsx
export default function Loading() {
  return <div>Loading products...</div>
}

Server Actions

Server Actions allow you to run server-side code directly from client components.

Form with Server Action:

// app/actions.ts
'use server'

import { revalidatePath } from 'next/cache'

export async function createPost(formData: FormData) {
  const title = formData.get('title') as string
  const content = formData.get('content') as string

  await db.post.create({
    data: { title, content }
  })

  revalidatePath('/posts')
}

// app/new-post/page.tsx
import { createPost } from '../actions'

export default function NewPostPage() {
  return (
    <form action={createPost}>
      <input name="title" placeholder="Title" required />
      <textarea name="content" placeholder="Content" required />
      <button type="submit">Create Post</button>
    </form>
  )
}

Server Action with useTransition:

// app/actions.ts
'use server'

export async function updateUser(userId: string, data: UserData) {
  await db.user.update({
    where: { id: userId },
    data,
  })
  return { success: true }
}

// app/profile/page.tsx
'use client'

import { useTransition } from 'react'
import { updateUser } from '../actions'

export default function ProfilePage() {
  const [isPending, startTransition] = useTransition()

  const handleSubmit = (formData: FormData) => {
    startTransition(async () => {
      await updateUser('user-id', {
        name: formData.get('name') as string,
      })
    })
  }

  return (
    <form action={handleSubmit}>
      <input name="name" />
      <button disabled={isPending}>
        {isPending ? 'Saving...' : 'Save'}
      </button>
    </form>
  )
}

Authentication Pattern

Basic Authentication with Middleware:

// lib/auth.ts
import { cookies } from 'next/headers'
import { redirect } from 'next/navigation'

export async function getSession() {
  const session = cookies().get('session')?.value
  if (!session) return null
  return await verifySession(session)
}

export async function requireAuth() {
  const session = await getSession()
  if (!session) {
    redirect('/login')
  }
  return session
}

// app/dashboard/page.tsx
import { requireAuth } from '@/lib/auth'

export default async function DashboardPage() {
  const session = await requireAuth()

  return (
    <div>
      <h1>Welcome, {session.user.name}</h1>
    </div>
  )
}

// app/api/login/route.ts
import { cookies } from 'next/headers'

export async function POST(request: Request) {
  const { email, password } = await request.json()

  const user = await validateCredentials(email, password)

  if (!user) {
    return Response.json({ error: 'Invalid credentials' }, { status: 401 })
  }

  const session = await createSession(user)
  cookies().set('session', session, {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    maxAge: 60 * 60 * 24 * 7, // 1 week
  })

  return Response.json({ success: true })
}

Database Pattern

Prisma with Server Components:

// lib/db.ts
import { PrismaClient } from '@prisma/client'

const globalForPrisma = global as unknown as { prisma: PrismaClient }

export const prisma = globalForPrisma.prisma || new PrismaClient()

if (process.env.NODE_ENV !== 'production') globalForPrisma.prisma = prisma

// app/posts/page.tsx
import { prisma } from '@/lib/db'

async function getPosts() {
  return await prisma.post.findMany({
    orderBy: { createdAt: 'desc' },
    include: { author: true },
  })
}

export default async function PostsPage() {
  const posts = await getPosts()

  return (
    <div>
      {posts.map((post) => (
        <article key={post.id}>
          <h2>{post.title}</h2>
          <p>By {post.author.name}</p>
          <p>{post.content}</p>
        </article>
      ))}
    </div>
  )
}

Caching Strategies

Revalidate on Demand:

// app/actions.ts
'use server'

import { revalidatePath, revalidateTag } from 'next/cache'

export async function createPost(data: PostData) {
  await db.post.create({ data })

  // Revalidate specific path
  revalidatePath('/posts')

  // Or revalidate by tag
  revalidateTag('posts')
}

// Fetch with cache tags
async function getPosts() {
  const res = await fetch('https://api.example.com/posts', {
    next: { tags: ['posts'] }
  })
  return res.json()
}

Time-based Revalidation:

async function getData() {
  const res = await fetch('https://api.example.com/data', {
    next: { revalidate: 3600 } // Revalidate every hour
  })
  return res.json()
}

Route Segment Config:

// app/blog/page.tsx
export const revalidate = 3600 // Revalidate every hour
export const dynamic = 'force-static' // Force static generation
export const fetchCache = 'force-cache' // Force cache for all fetch requests

export default async function BlogPage() {
  const posts = await getPosts()
  return <div>{/* ... */}</div>
}

Best Practices

1. Use Server Components by Default

Server Components are the default and provide better performance. Only use Client Components when needed.

// ✅ Good - Server Component
async function getData() {
  const res = await fetch('https://api.example.com/data')
  return res.json()
}

export default async function Page() {
  const data = await getData()
  return <div>{data.title}</div>
}

// ✅ Good - Client Component only when needed
'use client'

import { useState } from 'react'

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

2. Fetch Data Where You Need It

Don't prop-drill data. Fetch data in the component that needs it.

// ✅ Good - Fetch where needed
async function Header() {
  const user = await getUser()
  return <div>Welcome, {user.name}</div>
}

async function Posts() {
  const posts = await getPosts()
  return <div>{/* render posts */}</div>
}

export default function Page() {
  return (
    <>
      <Header />
      <Posts />
    </>
  )
}

3. Use Parallel Data Fetching

Fetch data in parallel when possible to reduce loading time.

// ✅ Good - Parallel fetching
export default async function Page() {
  const [user, posts] = await Promise.all([
    getUser(),
    getPosts()
  ])

  return <div>{/* ... */}</div>
}

4. Optimize Images

Always use the Image component for automatic optimization.

// ✅ Good
import Image from 'next/image'

<Image
  src="/hero.jpg"
  alt="Hero"
  width={1920}
  height={1080}
  priority
/>

// ❌ Bad
<img src="/hero.jpg" alt="Hero" />

5. Use Metadata API for SEO

Define metadata for every page.

// ✅ Good
export const metadata = {
  title: 'My Page',
  description: 'Page description',
}

export default function Page() {
  return <div>Content</div>
}

6. Implement Error Boundaries

Add error.tsx files for error handling.

// app/error.tsx
'use client'

export default function Error({ error, reset }: { error: Error, reset: () => void }) {
  return (
    <div>
      <h2>Something went wrong!</h2>
      <button onClick={reset}>Try again</button>
    </div>
  )
}

7. Use Loading States

Add loading.tsx files for loading UI.

// app/loading.tsx
export default function Loading() {
  return <div>Loading...</div>
}

8. Implement Route Handlers for APIs

Use Route Handlers instead of API routes in pages directory.

// ✅ Good - app/api/users/route.ts
export async function GET(request: Request) {
  const users = await db.user.findMany()
  return Response.json(users)
}

9. Use Middleware for Common Logic

Implement authentication, redirects, and rewrites in middleware.

// middleware.ts
export function middleware(request: NextRequest) {
  const token = request.cookies.get('token')

  if (!token) {
    return NextResponse.redirect(new URL('/login', request.url))
  }

  return NextResponse.next()
}

10. Optimize Fonts

Use next/font for automatic font optimization.

// ✅ Good
import { Inter } from 'next/font/google'

const inter = Inter({ subsets: ['latin'] })

export default function RootLayout({ children }) {
  return (
    <html className={inter.className}>
      <body>{children}</body>
    </html>
  )
}

Common Patterns

Blog Pattern

// app/blog/page.tsx
import Link from 'next/link'

async function getPosts() {
  const res = await fetch('https://api.example.com/posts', {
    next: { revalidate: 3600 }
  })
  return res.json()
}

export default async function BlogPage() {
  const posts = await getPosts()

  return (
    <div>
      <h1>Blog</h1>
      {posts.map((post) => (
        <article key={post.id}>
          <h2>
            <Link href={`/blog/${post.slug}`}>{post.title}</Link>
          </h2>
          <p>{post.excerpt}</p>
        </article>
      ))}
    </div>
  )
}

// app/blog/[slug]/page.tsx
import { notFound } from 'next/navigation'

async function getPost(slug: string) {
  const res = await fetch(`https://api.example.com/posts/${slug}`)
  if (!res.ok) return null
  return res.json()
}

export async function generateStaticParams() {
  const posts = await fetch('https://api.example.com/posts').then(r => r.json())
  return posts.map((post) => ({ slug: post.slug }))
}

export async function generateMetadata({ params }: { params: { slug: string } }) {
  const post = await getPost(params.slug)
  if (!post) return {}

  return {
    title: post.title,
    description: post.excerpt,
  }
}

export default async function BlogPostPage({ params }: { params: { slug: string } }) {
  const post = await getPost(params.slug)

  if (!post) {
    notFound()
  }

  return (
    <article>
      <h1>{post.title}</h1>
      <div dangerouslySetInnerHTML={{ __html: post.content }} />
    </article>
  )
}

E-commerce Pattern

// app/products/page.tsx
import { Suspense } from 'react'
import ProductGrid from './ProductGrid'
import Filters from './Filters'

export default function ProductsPage({
  searchParams,
}: {
  searchParams: { category?: string; sort?: string }
}) {
  return (
    <div>
      <h1>Products</h1>
      <Filters />
      <Suspense fallback={<div>Loading products...</div>}>
        <ProductGrid searchParams={searchParams} />
      </Suspense>
    </div>
  )
}

// app/products/ProductGrid.tsx
async function getProducts(category?: string, sort?: string) {
  const params = new URLSearchParams()
  if (category) params.set('category', category)
  if (sort) params.set('sort', sort)

  const res = await fetch(`https://api.example.com/products?${params}`, {
    next: { revalidate: 300 }
  })
  return res.json()
}

export default async function ProductGrid({
  searchParams,
}: {
  searchParams: { category?: string; sort?: string }
}) {
  const products = await getProducts(searchParams.category, searchParams.sort)

  return (
    <div className="grid">
      {products.map((product) => (
        <ProductCard key={product.id} product={product} />
      ))}
    </div>
  )
}

// app/products/[id]/page.tsx
async function getProduct(id: string) {
  const res = await fetch(`https://api.example.com/products/${id}`)
  return res.json()
}

export default async function ProductPage({ params }: { params: { id: string } }) {
  const product = await getProduct(params.id)

  return (
    <div>
      <h1>{product.name}</h1>
      <p>{product.description}</p>
      <p>${product.price}</p>
      <AddToCartButton productId={product.id} />
    </div>
  )
}

Dashboard Pattern

// app/dashboard/layout.tsx
import { requireAuth } from '@/lib/auth'
import Sidebar from './Sidebar'

export default async function DashboardLayout({
  children,
}: {
  children: React.ReactNode
}) {
  const session = await requireAuth()

  return (
    <div className="dashboard">
      <Sidebar user={session.user} />
      <main>{children}</main>
    </div>
  )
}

// app/dashboard/page.tsx
import { Suspense } from 'react'
import Stats from './Stats'
import RecentActivity from './RecentActivity'
import Chart from './Chart'

export default function DashboardPage() {
  return (
    <div>
      <h1>Dashboard</h1>

      <Suspense fallback={<div>Loading stats...</div>}>
        <Stats />
      </Suspense>

      <div className="grid">
        <Suspense fallback={<div>Loading chart...</div>}>
          <Chart />
        </Suspense>

        <Suspense fallback={<div>Loading activity...</div>}>
          <RecentActivity />
        </Suspense>
      </div>
    </div>
  )
}

Summary

This Next.js development skill covers:

1. App Router: Modern routing with file-based system 2. Server Components: Default server-side rendering for better performance 3. Data Fetching: Extended fetch API with caching and revalidation 4. Routing: Dynamic routes, catch-all routes, route groups, parallel routes 5. Layouts: Nested layouts, templates, and layout composition 6. Loading States: Automatic loading UI with Suspense 7. Error Handling: Error boundaries and not-found pages 8. API Routes: Route handlers with Web APIs 9. Middleware: Request interception and modification 10. Metadata: SEO optimization with Metadata API 11. Image Optimization: Automatic image optimization with Image component 12. Font Optimization: Automatic font loading with next/font 13. Server Actions: Server-side mutations from client components 14. Authentication: Session management and protected routes 15. Best Practices: Performance optimization, caching strategies, and common patterns

All patterns are based on official Next.js documentation (Trust Score: 10) and represent modern Next.js 13+ App Router development practices.

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