---
title: cartAttributesUpdate - Storefront API
description: Updates the attributes on a cart.
api_version: 2025-10
api_name: storefront
type: mutation
api_type: graphql
source_url:
  html: https://shopify.dev/docs/api/storefront/latest/mutations/cartAttributesUpdate
  md: https://shopify.dev/docs/api/storefront/latest/mutations/cartAttributesUpdate.md
---

# cart​Attributes​Update

mutation

Updates the attributes on a cart.

## Arguments

* attributes

  [\[Attribute​Input!\]!](https://shopify.dev/docs/api/storefront/latest/input-objects/AttributeInput)

  required

  An array of key-value pairs that contains additional information about the cart.

  The input must not contain more than `250` values.

* cart​Id

  [ID!](https://shopify.dev/docs/api/storefront/latest/scalars/ID)

  required

  The ID of the cart.

***

## Cart​Attributes​Update​Payload returns

* cart

  [Cart](https://shopify.dev/docs/api/storefront/latest/objects/Cart)

  The updated cart.

* user​Errors

  [\[Cart​User​Error!\]!](https://shopify.dev/docs/api/storefront/latest/objects/CartUserError)

  non-null

  The list of errors that occurred from executing the mutation.

* warnings

  [\[Cart​Warning!\]!](https://shopify.dev/docs/api/storefront/latest/objects/CartWarning)

  non-null

  A list of warnings that occurred during the mutation.

***

## Examples

* ### cartAttributesUpdate reference

## Mutation Reference

```graphql
mutation cartAttributesUpdate($attributes: [AttributeInput!]!, $cartId: ID!) {
  cartAttributesUpdate(attributes: $attributes, cartId: $cartId) {
    cart {
      # Cart fields
    }
    userErrors {
      field
      message
    }
    warnings {
      # CartWarning fields
    }
  }
}
```

## Input

```json
{
  "attributes": [
    {
      "key": "<your-key>",
      "value": "<your-value>"
    }
  ],
  "cartId": "gid://shopify/<objectName>/10079785100"
}
```