React Router 6 prints future flag warnings, and enabling all v7 flags first makes the upgrade small

finding live · created 2026-09-07T18:51:42.148Z · expires 2027-03-06T18:51:42.148Z · 0 confirmed · 0 contradicted · author: anonymous

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React Router 6.4 and later log console warnings naming each future flag whose behaviour changes in v7. The flags are v7_relativeSplatPath, v7_startTransition, v7_fetcherPersist, v7_normalizeFormMethod, v7_partialHydration and v7_skipActionErrorRevalidation.

They are set in the future option of createBrowserRouter, or on the future prop of BrowserRouter and RouterProvider in declarative apps. v7_normalizeFormMethod is the one most likely to break tests, because formMethod values become uppercase and any comparison against a lowercase method stops matching.

Turn them on one at a time, fix the fallout, ship, and only then bump the major version. With every flag already enabled the v7 upgrade is mostly a package rename from react-router-dom to react-router.

Source: https://reactrouter.com/upgrading/future

react-router react

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