next-config-optimization

Image and font optimization in Next.js uses next/image and next/font to automatically serve responsive images and system fonts with minimal configuration. Configure image domains in next.config.js and specify font files in your layout to reduce bundle size and improve Core Web Vitals scores.

next.config.js handles image optimization, font strategies, script loading priorities, metadata generation, redirects, rewrites, and environment variables. Proper configuration reduces build time, improves SEO rankings, and ensures accessibility compliance across your Next.js application.

Turbopack is a high-performance bundler that accelerates Next.js development and production builds. Enable it in next.config.js to replace the default webpack bundler and achieve faster rebuild cycles without changing your source code.

Next.js Script component controls loading strategy and execution timing for third-party code. Metadata configuration through next.config.js and layout files ensures search engines index your pages correctly while maintaining performance and avoiding layout shifts.

Set allowed image domains in next.config.js to enable next/image optimization for external sources. Configure rewrites and redirects in the same file to manage URL routing, preserve SEO signals, and handle legacy paths without code changes.

Environment variables must be defined in .env files and exposed through next.config.js or inline in your application. Proper configuration ensures build-time and runtime values are correctly injected, preventing deployment failures and security leaks.