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Next.js 15 Complete Guide for Production Apps

Everything you need to know about Next.js 15 — App Router, Server Actions, caching, and deployment best practices.

Jordan Kim 18 min read
#nextjs #react #frameworks #beginner #advanced

Introduction

Next.js 15 represents a mature full-stack React framework with production-grade tooling for modern web applications.

What’s New in Next.js 15

Caching Defaults

Next.js 15 changed default caching behavior. fetch requests are no longer cached by default, giving developers explicit control.

Turbopack Dev Server

Turbopack is now stable for local development, offering significantly faster refresh times on large codebases.

Server Actions

Server Actions enable type-safe server mutations without API route boilerplate.

'use server'

export async function createPost(formData: FormData) {
  const title = formData.get('title') as string;
  // persist to database
}

App Router Architecture

The App Router uses a file-system based routing with:

  • layout.tsx for shared UI
  • page.tsx for route content
  • loading.tsx for Suspense boundaries
  • error.tsx for error boundaries

Deployment

For hosting comparisons, see our Vercel vs Netlify guide. For static-first alternatives, check the Astro Static Sites Guide.

Best Practices

  1. Use Server Components by default
  2. Add 'use client' only when needed
  3. Leverage generateStaticParams for SSG
  4. Configure caching explicitly per route

Frequently Asked Questions

Should I migrate to Next.js 15?

If you're on Next.js 14, migration is straightforward for most apps. Review breaking changes around caching defaults and async request APIs first.

Is the App Router production-ready?

Yes. The App Router is the recommended approach for new Next.js projects as of 2025.

What about Pages Router?

Pages Router remains supported but App Router receives new features. New projects should use App Router.

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