All 7 Named Routes & Navigator 2.0 (Router API) questions
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What are named routes in Flutter, and how do they let you navigate to a specific screen simply by referencing a genuinely simple string identifier rather than needing to directly construct that particular widget yourself? How do you actually properly pass arguments to a destination screen when using Navigator.pushNamed, and how does that destination screen then actually properly retrieve those particular passed arguments? What is Navigator 2.0, and how does its own declarative Router based approach genuinely differ from the earlier imperative push and pop based navigation approach used by Navigator 1.0? How do you properly implement nested navigation using a considerably more complex router structure, such as one genuinely needed to properly support a bottom navigation bar where each individual tab genuinely maintains its own entirely separate independent navigation stack? How can you properly implement route guards using go_router's own redirect functionality to properly control access to specific protected routes based on a user's own current genuine authentication state? How do you properly test navigation logic, including verifying that a specific given route correctly and reliably navigates to its own expected screen and that a redirect properly and correctly occurs when genuinely expected?
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Flutter › Named Routes & Navigator 2.0 (Router API)

How does the go_router package provide a considerably higher level, considerably more genuinely convenient declarative routing API built directly on top of Flutter's own more complex, considerably more verbose lower level Navigator 2.0 APIs?

Intermediate

Answer

The go_router package significantly simplifies working with Navigator 2.0 by letting you define your app's entire complete set of routes using a genuinely straightforward declarative list of GoRoute objects, each specifying a genuine URL path pattern together with a corresponding builder function, and it automatically and properly handles the considerably more complex underlying details of properly parsing incoming URLs, managing browser history correctly, and supporting nested routes, meaning most Flutter teams genuinely choose to use go_router rather than directly working with the raw, considerably more verbose Navigator 2.0 API completely by hand themselves.
final router = GoRouter(
  routes: [
    GoRoute(path: '/', builder: (context, state) => HomeScreen()),
    GoRoute(path: '/product/:id', builder: (context, state) => ProductScreen(id: state.pathParameters['id']!)),
  ],
);
Real-world example A team migrates their entire app's own navigation logic over to go_router, meaningfully reducing the total amount of navigation related boilerplate code compared to their previous considerably more verbose raw hand written Navigator 2.0 implementation.

Common follow-ups: What genuinely other popular alternative routing packages besides go_router also exist within the broader Flutter ecosystem?;How does go_router genuinely properly handle a redirect, such as requiring a user to first be authenticated before actually reaching a specific given protected route?

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All 7 Named Routes & Navigator 2.0 (Router API) questions