By A/B testing at the edge, you'll reduce layout shift from client-loaded experiments and improve your site's performance with smaller JavaScript bundles.

https://edge-functions-ab-testing-simple.vercel.app

Since the different variants are generated statically at the edge, it mitigates any potential layout shift that could happen when a variant is inserted into the DOM client side, hence improving your site's performance.

Take a look at middleware.ts to see how it works.

You can choose from one of the following two methods to use this repository:

Deploy the example using Vercel:

Execute create-next-app with pnpm to bootstrap the example:

pnpm create next-app --example https://github.com/vercel/examples/tree/main/edge-middleware/ab-testing-simple ab-testing-simple

Next, run Next.js in development mode:

pnpm dev

Deploy it to the cloud with Vercel (Documentation).