What's New in Next.js 15: Complete Feature Guide

Next.js 15 brings significant improvements to the React framework ecosystem. From stable Turbopack to enhanced Server Actions, this release focuses on performance, developer experience, and production reliability.

Enhanced Server Actions

// app/actions.ts
'use server'

import { revalidatePath } from 'next/cache';
import { redirect } from 'next/navigation';

export async function createPost(formData: FormData) {
  const title = formData.get('title') as string;
  const content = formData.get('content') as string;
  
  await db.posts.create({ title, content });
  
  revalidatePath('/posts');
  redirect('/posts');
}

Turbopack Performance

• 10x faster cold starts than Webpack
• Incremental compilation for instant updates
• Native TypeScript and JSX support
• Optimized memory usage