The https://reactrouter.com/en/main/routers/picking-a-router#web-projects page says > We recommend all web projects use [createBrowserRouter](https://reactrouter.com/en/main/routers/create-browser-router). The code in https://github.com/fullstack-hy2020/misc/blob/7c570a193b7286f6d0492242c6d7c347728dd6ef/router-app-v2.js#L5 will require a migration.