What Is the Next.js App Router?
The Next.js App Router is the modern routing system introduced in Next.js, built around React Server Components. Instead of keeping all routes in one configuration file, you create routes using folders and special files inside the appdirectory.
For example, app/about/page.tsx automatically creates the /about route. Simple, right?
The App Router also provides built-in support for layouts, loading states, error handling, and dynamic routes, making it easier to organize larger applications.
How Does the App Router Work?
The basic structure is straightforward:
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app/page.tsx→ Homepage -
app/about/page.tsx→ About page -
app/blog/[slug]/page.tsx→ Dynamic blog page -
app/layout.tsx→ Shared layout
By default, components inside the App Router are Server Components. You can use "use client" when a component needs browser-side interactivity, such as state or event handlers.
Conclusion
The Next.js App Router gives you a structured way to build modern React applications with routing, layouts, data fetching, and Server Components. Start with the app directory and learn its core files first. Build a small project and experiment with nested and dynamic routes to get comfortable quickly.
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