[aosaigh]

I use Next.js with Django regularly. Just set up Django as a REST API only. Have Next.js talk to the API either at build-time or run-time, whichever suits your use-case. You could even proxy calls to your backend server via Next.js server-side functions if needs be.

I find the full-stack-in-one-codebase approach that Next.js takes very hard to work with. It becomes hard to know what is "frontend" and what is "backend". Mixing server-side components with client-side components is a mess. So I stick to a traditional SPA approach: front-end static site and back-end REST API server.