Next.js 15 Key Features and Updates

date

slug

nextjs-15

status

Published

1. Server Actions (Stable Release)

Server Actions are now stable in Next.js 15, allowing you to write server-side mutations directly in your React components. This eliminates the need for separate API endpoints for form submissions and data updates.


// Example of a Server Action
async function submitForm(formData) {
  'use server'
  const data = await saveToDatabase(formData)
  revalidatePath('/')
}

2. Partial Prerendering (Preview)

A revolutionary rendering model that combines static and dynamic content, allowing parts of a page to be static while others stream in dynamically.

3. Enhanced Image Component

The next/image component has been optimized for better performance and includes new features like:

Improved lazy loading behavior

Better image optimization

More responsive image handling

4. Improved Development Experience

Several developer experience improvements including:

Faster refresh times in development

Better error messages

Enhanced debugging capabilities

5. Turbopack Improvements

Continued improvements to Turbopack, offering:

Faster build times

Better memory usage

Enhanced stability

6. Enhanced Router Capabilities

The App Router now includes:

Improved parallel routing

Better handling of dynamic routes

Enhanced error boundary handling

7. SEO Optimizations

New SEO features and improvements:

Enhanced metadata API

Better sitemap generation

Improved robots.txt handling

8. Security Enhancements

Strengthened security features including:

Enhanced CSP configurations

Improved authentication patterns

Better CORS handling

9. Performance Optimizations

Various performance improvements:

Reduced JavaScript bundle sizes

Better code splitting

Improved caching strategies

10. Enhanced TypeScript Support

Better TypeScript integration with:

Improved type inference

Enhanced autocomplete

Better error messages

11. Middleware Improvements

Enhanced middleware capabilities with:

More flexible routing patterns

Better response handling

Improved performance

12. Static Export Enhancements

Improved static export functionality:

Better handling of dynamic routes

Enhanced asset optimization

Improved build process

13. Data Fetching Improvements

Enhanced data fetching capabilities:

Better cache management

Improved revalidation strategies

Enhanced error handling

14. Environment Variable Handling

Improved environment variable management:

Better runtime configuration

Enhanced security for sensitive data

More flexible configuration options

15. Documentation and Learning Resources

Enhanced documentation and resources:

More comprehensive guides

Better examples and tutorials

Improved API documentation

Getting Started

To upgrade to Next.js 15:


npm install next@latest react@latest react-dom@latest
# or
yarn add next@latest react@latest react-dom@latest
# or
pnpm add next@latest react@latest react-dom@latest

Prince