Storefront API
Shopify's API for building custom shopping experiences.
The Storefront API is Shopify's GraphQL API for reading products and collections and managing carts and checkouts from any front end — a custom website, a mobile app, or a headless build. It is the bridge that makes headless commerce and app-based shopping possible while Shopify still handles the secure checkout. We use it when a project needs a shopping experience beyond a standard themed storefront.