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Nextjs App Router Patterns

nextjs-app-router-patterns

Master Next.js 14+ App Router with Server Components, streaming, parallel routes, and advanced data fetching. Use when building Next.js applications, implementing SSR/SSG, or optimizing React Server Components.

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محتوى SKILL.md

Next.js App Router Patterns

Comprehensive patterns for Next.js 14+ App Router architecture, Server Components, and modern full-stack React development.

When to Use This Skill

  • Building new Next.js applications with App Router
  • Migrating from Pages Router to App Router
  • Implementing Server Components and streaming
  • Setting up parallel and intercepting routes
  • Optimizing data fetching and caching
  • Building full-stack features with Server Actions

Core Concepts

1. Rendering Modes

ModeWhereWhen to Use
Server ComponentsServer onlyData fetching, heavy computation, secrets
Client ComponentsBrowserInteractivity, hooks, browser APIs
StaticBuild timeContent that rarely changes
DynamicRequest timePersonalized or real-time data
StreamingProgressiveLarge pages, slow data sources

2. File Conventions

app/
├── layout.tsx       # Shared UI wrapper
├── page.tsx         # Route UI
├── loading.tsx      # Loading UI (Suspense)
├── error.tsx        # Error boundary
├── not-found.tsx    # 404 UI
├── route.ts         # API endpoint
├── template.tsx     # Re-mounted layout
├── default.tsx      # Parallel route fallback
└── opengraph-image.tsx  # OG image generation

Quick Start

typescript
// app/layout.tsx
import { Inter } from 'next/font/google'
import { Providers } from './providers'

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

export const metadata = {
  title: { default: 'My App', template: '%s | My App' },
  description: 'Built with Next.js App Router',
}

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

// app/page.tsx - Server Component by default
async function getProducts() {
  const res = await fetch('https://api.example.com/products', {
    next: { revalidate: 3600 }, // ISR: revalidate every hour
  })
  return res.json()
}

export default async function HomePage() {
  const products = await getProducts()

  return (
    <main>
      <h1>Products</h1>
      <ProductGrid products={products} />
    </main>
  )
}

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

Best Practices

Do's

  • Start with Server Components - Add 'use client' only when needed
  • Colocate data fetching - Fetch data where it's used
  • Use Suspense boundaries - Enable streaming for slow data
  • Leverage parallel routes - Independent loading states
  • Use Server Actions - For mutations with progressive enhancement

Don'ts

  • Don't pass serializable data - Server → Client boundary limitations
  • Don't use hooks in Server Components - No useState, useEffect
  • Don't fetch in Client Components - Use Server Components or React Query
  • Don't over-nest layouts - Each layout adds to the component tree
  • Don't ignore loading states - Always provide loading.tsx or Suspense

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