Implementing protected routes in Flutter should be straightforward, yet it remains one of the most common sources of frustration when adopting go_router . You define a redirect guard, wire it up to your authentication state, run the app, and immediately hit a wall: the console explodes with a "Stack Overflow" error, or the UI stutters as the router bounces endlessly between / and /login . This isn't a bug in GoRouter. It is a logical recursion error in how the redirection state is handled. The Root Cause: Recursive Redirection To fix the loop, you must understand the mechanics of the redirect callback. GoRouter's redirect function triggers on every navigation event. This includes the navigation events initiated by the redirect function itself. Here is the anatomy of an infinite loop: User starts app (unauthenticated). Router attempts to load / (Home). Guard checks: isLoggedIn is fa...
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