How to Build a Shopify Checkout UI Extension: A Practical 2026 Guide

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Shopify Checkout UI Extensions allow developers to embed sandboxed React or Preact components into fixed slots within the checkout flow, such as adding a delivery instructions field next to cart items. Unlike Shopify Functions, which run server-side to handle discounts or shipping logic, UI extensions render visible, interactive elements on the client side inside a Web Worker sandbox. This guide walks through scaffolding a real extension using Shopify CLI, reading and writing checkout data via the shopify global object, and deploying it within platform constraints. Notably, Shopify Scripts — the legacy tool for custom discount and shipping logic on Plus stores — stopped executing on June 30, 2026, meaning any remaining Scripts must now be migrated to Functions. Developers need a Partner account, a development store with checkout extensibility enabled, and a compatible app to attach the extension to before getting started.

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