Next.js ships with Fast Refresh which gives you instantaneous feedback on edits made to your React components.

This demos shows how the state of an auto incrementing value and a classic counter is preserved after edits or if there are errors.

Deploy the example using Vercel:

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

npx create-next-app --example fast-refresh-demo fast-refresh-demo
# or
yarn create next-app --example fast-refresh-demo fast-refresh-demo

Deploy it to the cloud with Vercel (Documentation).