---
title: useExtensionApi
description: |-
  Returns the full API object that was passed in to your extension when it was created.
  Depending on the extension point, this object can contain different properties.

  For example, the `Checkout::CartLineDetails::RenderAfter` extension point will return the [CartLineDetailsApi](/docs/api/checkout-ui-extensions/apis/cartlinedetailsapi) object.
  Whereas others return the [StandardApi](/docs/api/checkout-ui-extensions/apis/standardapi) object.

  For reference, see [ExtensionPoints](/docs/api/checkout-ui-extensions/apis/extensionpoints) to determine what API object will be returned by your extension point.
api_version: 2025-10
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/utilities/useextensionapi
  md: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/utilities/useextensionapi.md
---

use​Extension​Api

Not supported in this version.