Next.js 15 Is Here. Your Site Is Already Outdated.

Next.js 15 is a revolutionary update that changes how we build web applications. With stable Turbopack, React 19 support, and significant App Router improvements, it's the perfect time to upgrade your projects.

Turbopack is Now Stable#

After years in development, Turbopack is finally production-ready. This is the most significant change in terms of developer experience.

• Up to 10x faster than Webpack on initial compilation
• Instant HMR (Hot Module Replacement) — Changes reflect in milliseconds
• Compatible with most existing Webpack plugins
• Better memory usage — Ideal for large projects

# Enable Turbopack in development
next dev --turbo

# Or in package.json
{
  "scripts": {
    "dev": "next dev --turbo"
  }
}

React 19 Support#

Next.js 15 comes fully prepared for React 19, including all new features like improved Server Components, Actions, and the new Suspense system.

Improved Server Components#

// app/products/page.tsx
// This component runs ONLY on the server
async function ProductList() {
  // Direct database access - no API needed
  const products = await db.products.findMany({
    where: { active: true },
    orderBy: { createdAt: 'desc' }
  });

  return (
    <ul className="grid grid-cols-3 gap-4">
      {products.map(product => (
        <ProductCard key={product.id} product={product} />
      ))}
    </ul>
  );
}

Actions for Mutations#

// components/AddToCart.tsx
function AddToCart({ productId }: { productId: string }) {
  async function addToCartAction() {
    'use server';
    await cart.add(productId);
    revalidatePath('/cart');
  }

  return (
    <form action={addToCartAction}>
      <button type="submit" className="btn-primary">
        Add to Cart
      </button>
    </form>
  );
}

Should You Upgrade?#

The best investment you can make in your project is keeping it updated. The cost of not updating grows exponentially over time.