ReactRouter has a convenience property on the Link element to allow an author to set the active className on a link. This example replicates that functionality using Next's own Link component with the new app router.

Deploy the example using Vercel or preview live with StackBlitz

Execute create-next-app with npm, Yarn, or pnpm to bootstrap the example:

npx create-next-app --example active-class-name active-class-name-app

yarn create next-app --example active-class-name active-class-name-app

pnpm create next-app --example active-class-name active-class-name-app

Deploy it to the cloud with Vercel (Documentation).