---
title: useExtensionLanguage
description: 'Returns the buyer''s language, as supported by the extension.'
api_version: 2023-04
api_name: checkout-ui-extensions
source_url:
  html: >-
    https://shopify.dev/docs/api/checkout-ui-extensions/2023-04/react-hooks/localization/useextensionlanguage
  md: >-
    https://shopify.dev/docs/api/checkout-ui-extensions/2023-04/react-hooks/localization/useextensionlanguage.md
---

# use​Extension​Language

Returns the buyer's language, as supported by the extension.

## use​Extension​Language()

### Returns

* Language

  ### Language

  * isoCode

    string

    The BCP-47 language tag. It may contain a dash followed by an ISO 3166-1 alpha-2 region code.

### Language

* isoCode

  The BCP-47 language tag. It may contain a dash followed by an ISO 3166-1 alpha-2 region code.

  ```ts
  string
  ```

```ts
export interface Language {
  /**
   * The BCP-47 language tag. It may contain a dash followed by an ISO 3166-1 alpha-2 region code.
   *
   * @example 'en' for English, or 'en-US' for English local to United States.
   * @see https://en.wikipedia.org/wiki/IETF_language_tag
   * @see https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
   */
  isoCode: string;
}
```

## Related

[APIs - StandardApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/standardapi)

[APIs - CheckoutApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/checkoutapi)

[APIs - OrderStatusApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/orderstatusapi)

[APIs - CartLineDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/cartlinedetailsapi)

[APIs - PickupPointsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuppointsapi)

[APIs - PickupLocationsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuplocationsapi)

[APIs - ShippingMethodDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/shippingmethoddetailsapi)

[APIs - ExtensionPoints](https://shopify.dev/docs/api/checkout-ui-extensions/apis/extensionpoints)