Introduction/Guides/MigratingMigratingApp RouterLearn how to upgrade your existing Next.js application from the Pages Router to the App Router.Create React AppLearn how to migrate your existing React application from Create React App to Next.js.ViteLearn how to migrate your existing React application from Vite to Next.js.Third Party LibrariesOptimize the performance of third-party libraries in your application with the `@next/third-parties` package.App RouterLearn how to upgrade your existing Next.js application from the Pages Router to the App Router.