Feature Flags in Next.js: The Complete Guide (App Router)

This was originally published on rollgate.io/blog/feature-flags-nextjs . Why Feature Flags in Next.js? Next.js is not a typical React app. With the App Router, your code runs in multiple environments — the server, the edge, and the browser — sometimes in the same request. This makes feature flags both more powerful and more complex than in a single-page application. Here is why feature flags matter specifically for Next.js: Server-Side Rendering creates a decision point. When a Server Component