Getting started with field validation

You're ready to create a checkout UI extension. You want to set up your development environment so that you can start coding.

In this tutorial, you'll use Shopify CLI to create a checkout UI extension. Shopify CLI generates starter code for building your extension and automates common development tasks.

You'll create a simple extension that renders some text in the checkout flow. You can build up this extension for more complex use cases.

An example UI with a custom input box, as rendered at checkout