Next.js 15 vs. Next.js 16: What's the Difference?

This blog was originally published on Descope . Next.js 16 marks a significant shift for the framework. What started as a simple SSR helper is now a comprehensive full-stack React engine. This release brings major changes: Turbopack replaces Webpack as the default bundler, Cache Components introduces Partial Pre-Rendering (PPR), and middleware.ts becomes proxy.ts. The performance improvements are substantial, but you still may not be ready to switch over. You might be concerned about bugs, don't