Hydrogen developer preview update: August 18, 2026

The Hydrogen developer preview adds new capabilities to the toolkit and extends the ways developers can build Shopify storefronts: Cart session attribution: Carts and Customer Account sessions stay in step, so signed-in shoppers reach checkout with their saved details instead of a guest flow. Cart attributes: Attach order-wide data like gift messages to the cart, and per-line data like engraving text to the lines it belongs to. Standard page view events: Hydrogen storefronts used to report only the first page load, leaving client-side navigations invisible to analytics and performance tooling.