---
title: Attributes
description: The API for interacting with cart and checkout attributes.
api_version: 2025-04
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/2025-04/apis/attributes
  md: https://shopify.dev/docs/api/checkout-ui-extensions/2025-04/apis/attributes.md
---

# AttributesAPI

The API for interacting with cart and checkout attributes.

## StandardApi

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

* attributes

  StatefulRemoteSubscribable\<Attribute\[] | undefined>

  required

  The custom attributes left by the customer to the merchant, either in their cart or during checkout.

### Attribute

* key

  The key for the attribute.

  ```ts
  string
  ```

* value

  The value for the attribute.

  ```ts
  string
  ```

```ts
export interface Attribute {
  /**
   * The key for the attribute.
   */
  key: string;

  /**
   * The value for the attribute.
   */
  value: string;
}
```

## CheckoutApi

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

* applyAttributeChange

  (change: AttributeChange) => Promise\<AttributeChangeResult>

  required

  Performs an update on an attribute attached to the cart and checkout. If successful, this mutation results in an update to the value retrieved through the [`attributes`](https://shopify.dev/docs/api/checkout-ui-extensions/apis/attributes#standardapi-propertydetail-attributes) property.

  Note

  This method will return an error if the [cart instruction](https://shopify.dev/docs/api/checkout-ui-extensions/apis/cart-instructions#standardapi-propertydetail-instructions) `attributes.canUpdateAttributes` is false, or the buyer is using an accelerated checkout method, such as Apple Pay, Google Pay, or Meta Pay.

### AttributeChange

```ts
AttributeUpdateChange | AttributeRemoveChange
```

### AttributeUpdateChange

Updates an attribute on the order. If an attribute with the provided key does not already exist, it gets created.

* key

  Key of the attribute to add or update

  ```ts
  string
  ```

* type

  The type of the \`AttributeUpdateChange\` API.

  ```ts
  "updateAttribute"
  ```

* value

  Value for the attribute to add or update

  ```ts
  string
  ```

```ts
export interface AttributeUpdateChange {
  /**
   * The type of the `AttributeUpdateChange` API.
   */
  type: 'updateAttribute';

  /**
   * Key of the attribute to add or update
   */
  key: string;

  /**
   * Value for the attribute to add or update
   */
  value: string;
}
```

### AttributeRemoveChange

Removes an attribute on the order if an attribute with the provided key already exists.

* key

  Key of the attribute to remove

  ```ts
  string
  ```

* type

  The type of the \`AttributeRemoveChange\` API.

  ```ts
  "removeAttribute"
  ```

```ts
export interface AttributeRemoveChange {
  /**
   * The type of the `AttributeRemoveChange` API.
   */
  type: 'removeAttribute';

  /**
   * Key of the attribute to remove
   */
  key: string;
}
```

### AttributeChangeResult

```ts
AttributeChangeResultSuccess | AttributeChangeResultError
```

### AttributeChangeResultSuccess

The returned result of a successful update to an attribute.

* type

  The type of the \`AttributeChangeResultSuccess\` API.

  ```ts
  "success"
  ```

```ts
export interface AttributeChangeResultSuccess {
  /**
   * The type of the `AttributeChangeResultSuccess` API.
   */
  type: 'success';
}
```

### AttributeChangeResultError

The returned result of an unsuccessful update to an attribute with a message detailing the type of error that occurred.

* message

  A message that explains the error. This message is useful for debugging. It is \*\*not\*\* localized, and therefore should not be presented directly to the buyer.

  ```ts
  string
  ```

* type

  The type of the \`AttributeChangeResultError\` API.

  ```ts
  "error"
  ```

```ts
export interface AttributeChangeResultError {
  /**
   * The type of the `AttributeChangeResultError` API.
   */
  type: 'error';

  /**
   * A message that explains the error. This message is useful for debugging.
   * It is **not** localized, and therefore should not be presented directly
   * to the buyer.
   */
  message: string;
}
```

## use​Apply​Attribute​Change()

Returns a function to mutate the `attributes` property of the checkout.

### Returns

* (change: AttributeChange) => Promise\<AttributeChangeResult>

### AttributeChange

```ts
AttributeUpdateChange | AttributeRemoveChange
```

### AttributeUpdateChange

Updates an attribute on the order. If an attribute with the provided key does not already exist, it gets created.

* key

  Key of the attribute to add or update

  ```ts
  string
  ```

* type

  The type of the \`AttributeUpdateChange\` API.

  ```ts
  "updateAttribute"
  ```

* value

  Value for the attribute to add or update

  ```ts
  string
  ```

```ts
export interface AttributeUpdateChange {
  /**
   * The type of the `AttributeUpdateChange` API.
   */
  type: 'updateAttribute';

  /**
   * Key of the attribute to add or update
   */
  key: string;

  /**
   * Value for the attribute to add or update
   */
  value: string;
}
```

### AttributeRemoveChange

Removes an attribute on the order if an attribute with the provided key already exists.

* key

  Key of the attribute to remove

  ```ts
  string
  ```

* type

  The type of the \`AttributeRemoveChange\` API.

  ```ts
  "removeAttribute"
  ```

```ts
export interface AttributeRemoveChange {
  /**
   * The type of the `AttributeRemoveChange` API.
   */
  type: 'removeAttribute';

  /**
   * Key of the attribute to remove
   */
  key: string;
}
```

### AttributeChangeResult

```ts
AttributeChangeResultSuccess | AttributeChangeResultError
```

### AttributeChangeResultSuccess

The returned result of a successful update to an attribute.

* type

  The type of the \`AttributeChangeResultSuccess\` API.

  ```ts
  "success"
  ```

```ts
export interface AttributeChangeResultSuccess {
  /**
   * The type of the `AttributeChangeResultSuccess` API.
   */
  type: 'success';
}
```

### AttributeChangeResultError

The returned result of an unsuccessful update to an attribute with a message detailing the type of error that occurred.

* message

  A message that explains the error. This message is useful for debugging. It is \*\*not\*\* localized, and therefore should not be presented directly to the buyer.

  ```ts
  string
  ```

* type

  The type of the \`AttributeChangeResultError\` API.

  ```ts
  "error"
  ```

```ts
export interface AttributeChangeResultError {
  /**
   * The type of the `AttributeChangeResultError` API.
   */
  type: 'error';

  /**
   * A message that explains the error. This message is useful for debugging.
   * It is **not** localized, and therefore should not be presented directly
   * to the buyer.
   */
  message: string;
}
```

## use​Attributes()

Returns the proposed `attributes` applied to the checkout.

### Returns

* Attribute\[] | undefined

### Attribute

* key

  The key for the attribute.

  ```ts
  string
  ```

* value

  The value for the attribute.

  ```ts
  string
  ```

```ts
export interface Attribute {
  /**
   * The key for the attribute.
   */
  key: string;

  /**
   * The value for the attribute.
   */
  value: string;
}
```

## use​Attribute​Values([keys](#useattributevalues-propertydetail-keys)​)

Returns the values for the specified `attributes` applied to the checkout.

### Parameters

* keys

  string\[]

  required

  An array of attribute keys.

### Returns

* (string | undefined)\[]

### Examples

* #### Attribute values

  ##### React

  ```jsx
  import {
    Text,
    reactExtension,
    useAttributeValues,
  } from '@shopify/ui-extensions-react/checkout';

  export default reactExtension(
    'purchase.checkout.block.render',
    () => <Extension />,
  );

  function Extension() {
    const [buyerSelectedFreeTShirt, tshirtSize] =
      useAttributeValues([
        'buyerSelectedFreeTShirt',
        'tshirtSize',
      ]);

    if (Boolean(buyerSelectedFreeTShirt) === true) {
      return (
        <Text>
          You selected a free t-shirt, size:{' '}
          {tshirtSize}
        </Text>
      );
    }

    return null;
  }
  ```

  ##### JavaScript

  ```js
  import {
    extension,
    Text,
  } from '@shopify/ui-extensions/checkout';

  export default extension(
    'purchase.checkout.block.render',
    (root, {attributes}) => {
      attributes.subscribe(() => {
        renderUI();
      });

      function renderUI() {
        const buyerSelectedFreeTShirt =
          attributes.current?.find(
            (attr) =>
              attr.key ===
              'buyerSelectedFreeTShirt',
          )?.value;

        const tshirtSize = attributes.current?.find(
          (attr) => attr.key === 'tshirtSize',
        )?.value;

        if (
          Boolean(buyerSelectedFreeTShirt) === true
        ) {
          root.replaceChildren(
            root.createComponent(
              Text,
              undefined,
              `You selected a free t-shirt, size: ${tshirtSize}`,
            ),
          );
        } else {
          root.replaceChildren();
        }
      }

      renderUI();
    },
  );
  ```

## Examples

Applying changes to attributes

You can add or remove cart and checkout attributes by using the `applyAttributeChange` API.

### Examples

* #### Applying changes to attributes

  ##### Description

  You can add or remove cart and checkout attributes by using the \`applyAttributeChange\` API.

  ##### React

  ```jsx
  import {
    reactExtension,
    BlockStack,
    Button,
    Text,
    useAttributeValues,
    useApplyAttributeChange,
    useInstructions,
  } from '@shopify/ui-extensions-react/checkout';

  export default reactExtension(
    'purchase.checkout.block.render',
    () => <Extension />,
  );

  function Extension() {
    const [giftWrapValue] = useAttributeValues([
      'giftWrap',
    ]);
    const giftWrap = Boolean(giftWrapValue);
    const applyAttributeChange =
      useApplyAttributeChange();
    const instructions = useInstructions();

    async function toggleGiftWrap() {
      const result = giftWrap
        ? await applyAttributeChange({
            type: 'removeAttribute',
            key: 'giftWrap',
          })
        : await applyAttributeChange({
            type: 'updateAttribute',
            key: 'giftWrap',
            value: 'true',
          });
      if (result.type === 'error') {
        console.error(result.message);
      }
    }

    return (
      <BlockStack spacing="tight">
        <Text>
          Gift wrapping:{' '}
          {giftWrap ? 'Added' : 'Not set'}
        </Text>
        <Button
          onPress={toggleGiftWrap}
          disabled={
            !instructions.attributes
              .canUpdateAttributes
          }
        >
          {giftWrap
            ? 'Remove gift wrap'
            : 'Add gift wrap'}
        </Button>
      </BlockStack>
    );
  }
  ```

  ##### JavaScript

  ```js
  import {
    extension,
    BlockStack,
    Button,
    Text,
  } from '@shopify/ui-extensions/checkout';

  export default extension(
    'purchase.checkout.block.render',
    (
      root,
      {
        attributes,
        instructions,
        applyAttributeChange,
      },
    ) => {
      let giftWrap = false;
      const text = root.createComponent(Text);
      const button = root.createComponent(Button, {
        onPress: async () => {
          const result = giftWrap
            ? await applyAttributeChange({
                type: 'removeAttribute',
                key: 'giftWrap',
              })
            : await applyAttributeChange({
                type: 'updateAttribute',
                key: 'giftWrap',
                value: 'true',
              });
          if (result.type === 'error') {
            console.error(result.message);
          }
        },
      });
      const blockStack = root.createComponent(
        BlockStack,
        {
          spacing: 'tight',
        },
        [text, button],
      );

      attributes.subscribe(updateUI);
      instructions.subscribe(updateUI);

      function updateUI() {
        giftWrap = Boolean(
          attributes.current?.find(
            (attr) => attr.key === 'giftWrap',
          )?.value,
        );

        text.replaceChildren(
          `Gift wrapping: ${giftWrap ? 'Added' : 'Not set'}`,
        );
        button.updateProps({
          disabled:
            !instructions.current?.attributes
              ?.canUpdateAttributes,
        });
        button.replaceChildren(
          giftWrap
            ? 'Remove gift wrap'
            : 'Add gift wrap',
        );
      }
      updateUI();

      root.append(blockstack);
    },
  );
  ```

## Related

[![](https://shopify.dev/images/icons/32/blocks.png)![](https://shopify.dev/images/icons/32/blocks-dark.png)](https://shopify.dev/docs/api/checkout-ui-extensions/targets)

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

[![](https://shopify.dev/images/icons/32/apps.png)![](https://shopify.dev/images/icons/32/apps-dark.png)](https://shopify.dev/docs/api/checkout-ui-extensions/components)

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

[![](https://shopify.dev/images/icons/32/gear.png)![](https://shopify.dev/images/icons/32/gear-dark.png)](https://shopify.dev/docs/api/checkout-ui-extensions/configuration)

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

[![](https://shopify.dev/images/icons/32/tutorial.png)![](https://shopify.dev/images/icons/32/tutorial-dark.png)](https://shopify.dev/apps/checkout)

[LearnTutorials](https://shopify.dev/apps/checkout)