Introduction/Building Your Application/UpgradingUpgrade GuideUpgrade your application to newer versions of Next.js or migrate from the Pages Router to the App Router.CodemodsUse codemods to upgrade your Next.js codebase when new features are released.App Router MigrationLearn how to upgrade your existing Next.js application from the Pages Router to the App Router.Migrating from ViteLearn how to migrate your existing React application from Vite to Next.js.CodemodsUse codemods to upgrade your Next.js codebase when new features are released.