Developers debate how much backend logic belongs inside Next.js vs Node.js

A developer building applications with Next.js has raised a widely discussed architectural question: how much backend logic should remain within Next.js before moving to a dedicated Node.js service. Next.js offers built-in backend capabilities such as Server Components, Route Handlers, and middleware, making it convenient for smaller applications to consolidate frontend and backend in one project. However, as applications scale, concerns around authentication, background processing, real-time communication, and independent scaling make a separate Node.js service increasingly attractive. The developer suggests the more useful question is not whether Next.js can serve as a backend, but which responsibilities will become problematic if kept inside it. They are seeking input from developers who have run both architectures in production, particularly those who have migrated away from a Next.js-only setup due to real-world scaling challenges.