# Cart and Checkout Validations are now available in Developer Preview — Shopify developer changelog
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## Cart and Checkout Validations are now available in Developer Preview

The Shopify Functions API for cart and checkout validations is now available in the Checkout Extensibility developer preview. 

This API allows you to apply validation rules that run in both the cart and checkout, ensuring that purchases meet certain criteria before checking out, or completing the order.

Learn more about building cart and checkout validations in our dev docs: [Cart and Checkout validations](https://shopify.dev/api/functions/reference/cart-checkout-validation)

*Published: February 09, 2023*
Tags: API, New
Link: https://shopify.dev/changelog/cart-and-checkout-validations-are-now-available-in-developer-preview

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