# Getting Started with Next.js 15 and the App Router Next.js 15 represents a significant leap forward in React framework development, introducing powerful new features that make building modern web applications more intuitive and performant than ever before. ## What's New in Next.js 15 The App Router is the new paradigm that embraces React's latest features: - **Server Components by default** - Better performance and SEO - **Streaming and Suspense** - Improved loading experiences - **Built-in SEO optimization** - Metadata API and structured data - **Enhanced routing** - Nested layouts and loading states ## Server Components: The Game Changer ```typescript // This runs on the server! export default async function BlogPage() { const posts = await fetch("/api/posts").then(r => r.json()) return (

{posts.map(post => (

{post.title}

{post.excerpt}

))}

) } ``` Server Components eliminate the need for useEffect hooks for data fetching, reducing bundle size and improving performance. ## The Power of Layouts The new layout system allows for sophisticated UI patterns: ```typescript export default function RootLayout({ children, }: { children: React.ReactNode }) { return (

{children}

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Next.js 15 App Router Guide - Build Modern React Apps