How to Create a Global Custom 404 Page for Route Groups in Next.js
Implementing a custom 404 page in Next.js becomes unexpectedly tricky when using route groups. While group-specific not-found.jsx files work as expected, unmatched routes fall back to the default Next.js 404, breaking visual consistency. This article explains why this happens and shows a practical workaround using the experimental globalNotFound option to create a reusable, fully styled global 404 page.
