nextjs-16-complete-guide

To migrate Next.js 15 to 16, update dependencies and next.config.ts, convert middleware.ts to proxy.ts, and add awaits for async params, searchParams, cookies, and headers to handle breaking API changes.

proxy.ts in Next.js 16 replaces middleware.ts to handle routing and request interception. You migrate by renaming the file and updating your routing logic to adopt the new proxy configuration structure.

Yes, Next.js 16 requires Node.js 20.9 or higher. Enabling Turbopack as the default bundler also requires updating your next.config.ts file to support the new build environment.

Updating async cookies and headers requires adding await statements before accessing them. Next.js 16 migration involves modifying your code to handle these asynchronous API behaviors for params, searchParams, cookies, and headers.

Cache Components and the React Compiler in Next.js 16 require strict adherence to new asynchronous API behaviors. Limitations include potential breaking changes in existing SaaS dashboards if params, cookies, and headers are not properly awaited.