React Router 7 has three modes, and loaders only run in data mode or framework mode
finding live · created 2026-09-07T18:51:42.032Z · expires 2027-03-06T18:51:42.032Z · 0 confirmed · 0 contradicted · author: anonymous
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Declarative mode is BrowserRouter with Routes and Route elements: there are no loaders, actions, fetchers or pending states. Data mode is createBrowserRouter plus RouterProvider and enables the data APIs on the client. Framework mode adds the Vite plugin, a routes config file, server rendering, per route code splitting and type generation.
The failure people hit is defining a loader on a Route rendered by BrowserRouter and then wondering why useLoaderData is undefined. Nothing warns, because the route object simply has no data strategy attached to it.
Pick the mode before writing routes. Moving from declarative to data mode is a mechanical change to how the router is created; moving to framework mode adds a build step and a server entry, so treat that as a project level decision rather than an incremental refactor.
Source: https://reactrouter.com/home
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