---
title: Localized Fields
description: The API for interacting with localized fields.
api_version: 2026-01
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/localized-fields
  md: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/localized-fields.md
---

# Localized Fields

**Requires access to \[protected customer data]\(/docs/apps/store/data-protection/protected-customer-data) for some properties.:**

The API for interacting with localized fields.

## StandardApi

The base API object provided to `purchase` extension targets.

* **localizedFields**

  **SubscribableSignalLike\<LocalizedField\[]>**

  The API for reading additional fields that are required in checkout under certain circumstances. For example, some countries require additional fields for customs information or tax identification numbers.

### SubscribableSignalLike

Represents a read-only value managed on the main thread that an extension can subscribe to. Example: Checkout uses this to manage the state of an object and communicate state changes to extensions running in a sandboxed web worker. This interface is compatible with \[Preact's ReadonlySignal]\(https://github.com/preactjs/signals/blob/a023a132a81bd4ba4a0bebb8cbbeffbd8c8bbafc/packages/core/src/index.ts#L700-L709). Some fields are deprecated but still supported for backwards compatibility. In version 2025-10, \[\`StatefulRemoteSubscribable\`]\(https://github.com/Shopify/remote-dom/blob/03929aa8418a89d41d294005f219837582718df8/packages/async-subscription/src/types.ts#L17) was replaced with \`ReadonlySignalLike\`. Checkout will remove the old fields some time in the future.

* current

  ```ts
  T
  ```

* destroy

  ```ts
  () => Promise<void>
  ```

* subscribe

  Subscribes to value changes and calls the provided function whenever the value updates. Returns an unsubscribe function to clean up the subscription. Use to automatically react to changes in the signal's value.

  ```ts
  (fn: (value: T) => void) => () => void
  ```

* value

  The current value of the signal. This property provides immediate access to the current value without requiring subscription setup. Use for one-time value checks or initial setup.

  ```ts
  T
  ```

### LocalizedField

* key

  ```ts
  LocalizedFieldKey
  ```

* title

  ```ts
  string
  ```

* value

  ```ts
  string
  ```

### LocalizedFieldKey

A union of keys for the localized fields that are required by certain countries.

```ts
'SHIPPING_CREDENTIAL_BR' | 'SHIPPING_CREDENTIAL_CL' | 'SHIPPING_CREDENTIAL_CN' | 'SHIPPING_CREDENTIAL_CO' | 'SHIPPING_CREDENTIAL_CR' | 'SHIPPING_CREDENTIAL_EC' | 'SHIPPING_CREDENTIAL_ES' | 'SHIPPING_CREDENTIAL_GT' | 'SHIPPING_CREDENTIAL_ID' | 'SHIPPING_CREDENTIAL_KR' | 'SHIPPING_CREDENTIAL_MY' | 'SHIPPING_CREDENTIAL_MX' | 'SHIPPING_CREDENTIAL_PE' | 'SHIPPING_CREDENTIAL_PT' | 'SHIPPING_CREDENTIAL_PY' | 'SHIPPING_CREDENTIAL_TR' | 'SHIPPING_CREDENTIAL_TW' | 'SHIPPING_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_BR' | 'TAX_CREDENTIAL_CL' | 'TAX_CREDENTIAL_CO' | 'TAX_CREDENTIAL_CR' | 'TAX_CREDENTIAL_EC' | 'TAX_CREDENTIAL_ES' | 'TAX_CREDENTIAL_GT' | 'TAX_CREDENTIAL_ID' | 'TAX_CREDENTIAL_IT' | 'TAX_CREDENTIAL_MX' | 'TAX_CREDENTIAL_MY' | 'TAX_CREDENTIAL_PE' | 'TAX_CREDENTIAL_PT' | 'TAX_CREDENTIAL_PY' | 'TAX_CREDENTIAL_TR' | 'TAX_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_TYPE_MX' | 'TAX_CREDENTIAL_USE_MX' | 'TAX_EMAIL_IT'
```

## use​Localized​Fields(**[keys](#uselocalizedfields-propertydetail-keys)**​)

Returns the current localized fields and re-renders your component if the values change.

### Parameters

* **keys**

  **LocalizedFieldKey\[]**

### Returns

* **LocalizedField\[]**

### LocalizedFieldKey

A union of keys for the localized fields that are required by certain countries.

```ts
'SHIPPING_CREDENTIAL_BR' | 'SHIPPING_CREDENTIAL_CL' | 'SHIPPING_CREDENTIAL_CN' | 'SHIPPING_CREDENTIAL_CO' | 'SHIPPING_CREDENTIAL_CR' | 'SHIPPING_CREDENTIAL_EC' | 'SHIPPING_CREDENTIAL_ES' | 'SHIPPING_CREDENTIAL_GT' | 'SHIPPING_CREDENTIAL_ID' | 'SHIPPING_CREDENTIAL_KR' | 'SHIPPING_CREDENTIAL_MY' | 'SHIPPING_CREDENTIAL_MX' | 'SHIPPING_CREDENTIAL_PE' | 'SHIPPING_CREDENTIAL_PT' | 'SHIPPING_CREDENTIAL_PY' | 'SHIPPING_CREDENTIAL_TR' | 'SHIPPING_CREDENTIAL_TW' | 'SHIPPING_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_BR' | 'TAX_CREDENTIAL_CL' | 'TAX_CREDENTIAL_CO' | 'TAX_CREDENTIAL_CR' | 'TAX_CREDENTIAL_EC' | 'TAX_CREDENTIAL_ES' | 'TAX_CREDENTIAL_GT' | 'TAX_CREDENTIAL_ID' | 'TAX_CREDENTIAL_IT' | 'TAX_CREDENTIAL_MX' | 'TAX_CREDENTIAL_MY' | 'TAX_CREDENTIAL_PE' | 'TAX_CREDENTIAL_PT' | 'TAX_CREDENTIAL_PY' | 'TAX_CREDENTIAL_TR' | 'TAX_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_TYPE_MX' | 'TAX_CREDENTIAL_USE_MX' | 'TAX_EMAIL_IT'
```

### LocalizedField

* key

  ```ts
  LocalizedFieldKey
  ```

* title

  ```ts
  string
  ```

* value

  ```ts
  string
  ```

## use​Localized​Field(**[key](#uselocalizedfield-propertydetail-key)**​)

Returns the requested localized field and re-renders your component if the value changes.

### Parameters

* **key**

  **LocalizedFieldKey**

  **required**

### Returns

* **LocalizedField | undefined**

### LocalizedFieldKey

A union of keys for the localized fields that are required by certain countries.

```ts
'SHIPPING_CREDENTIAL_BR' | 'SHIPPING_CREDENTIAL_CL' | 'SHIPPING_CREDENTIAL_CN' | 'SHIPPING_CREDENTIAL_CO' | 'SHIPPING_CREDENTIAL_CR' | 'SHIPPING_CREDENTIAL_EC' | 'SHIPPING_CREDENTIAL_ES' | 'SHIPPING_CREDENTIAL_GT' | 'SHIPPING_CREDENTIAL_ID' | 'SHIPPING_CREDENTIAL_KR' | 'SHIPPING_CREDENTIAL_MY' | 'SHIPPING_CREDENTIAL_MX' | 'SHIPPING_CREDENTIAL_PE' | 'SHIPPING_CREDENTIAL_PT' | 'SHIPPING_CREDENTIAL_PY' | 'SHIPPING_CREDENTIAL_TR' | 'SHIPPING_CREDENTIAL_TW' | 'SHIPPING_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_BR' | 'TAX_CREDENTIAL_CL' | 'TAX_CREDENTIAL_CO' | 'TAX_CREDENTIAL_CR' | 'TAX_CREDENTIAL_EC' | 'TAX_CREDENTIAL_ES' | 'TAX_CREDENTIAL_GT' | 'TAX_CREDENTIAL_ID' | 'TAX_CREDENTIAL_IT' | 'TAX_CREDENTIAL_MX' | 'TAX_CREDENTIAL_MY' | 'TAX_CREDENTIAL_PE' | 'TAX_CREDENTIAL_PT' | 'TAX_CREDENTIAL_PY' | 'TAX_CREDENTIAL_TR' | 'TAX_CREDENTIAL_TYPE_CO' | 'TAX_CREDENTIAL_TYPE_MX' | 'TAX_CREDENTIAL_USE_MX' | 'TAX_EMAIL_IT'
```

### LocalizedField

* key

  ```ts
  LocalizedFieldKey
  ```

* title

  ```ts
  string
  ```

* value

  ```ts
  string
  ```

Examples

### Examples

* #### Read localized fields

  ##### Preact

  ```jsx
  import '@shopify/ui-extensions/preact';
  import {render} from 'preact';

  import {
    useBuyerJourneyIntercept,
    useLocalizedField,
  } from '@shopify/ui-extensions/checkout/preact';

  export default function extension() {
    render(<Extension />, document.body);
  }

  function Extension() {
    // 1. Access localized field
    const taxIdField = useLocalizedField(
      'TAX_CREDENTIAL_BR',
    );

    // 2. Validate localized field value
    useBuyerJourneyIntercept(
      ({canBlockProgress}) => {
        return canBlockProgress &&
          taxIdField &&
          (!taxIdField.value ||
            taxIdField.value.length > 10)
          ? {
              behavior: 'block',
              reason: 'Invalid tax ID',
              errors: [
                {
                  message: `${taxIdField.title} is required and
                  cannot exceed 10 characters in length`,
                  // Show an error under the field
                  target: `$.cart.localizedField.${taxIdField.key}`,
                },
              ],
            }
          : {
              behavior: 'allow',
            };
      },
    );
  }
  ```

## Related

[Reference - Targets](https://shopify.dev/docs/api/checkout-ui-extensions/targets)

[Reference - Components](https://shopify.dev/docs/api/checkout-ui-extensions/components)

[Reference - Configuration](https://shopify.dev/docs/api/checkout-ui-extensions/configuration)

[Learn - Tutorials](https://shopify.dev/apps/checkout)