The Cart API is used to interact with a cart during a customer's session. This guide shows how to use the Cart API to update cart line items, add cart attributes and notes, and generate shipping rates.
All Ajax API requests should use [locale-aware URLs](/docs/api/ajax#locale-aware-urls) to give visitors a consistent experience.
> Note:
> For simplicity, the code examples in this guide don't always use a callback.
## POST /{locale}/cart/add.js
Use the `POST /{locale}/cart/add.js` endpoint to add one or multiple variants to the cart.
In the following example, `quantity` is the amount of the variant that you want to add and `id` is the variant ID of that variant. You can add multiple variants to the cart by appending more objects in the `items` array.
Below is a simplified `POST` request using the `fetch` API. The `formData` object is built in JavaScript, so the `Content-Type` should be set to `application/json` in the `headers` object. The response is the JSON of the line items associated with the added variants. If an item is already in the cart, then `quantity` is equal to the new quantity for that item.
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</div>
</div>
</div>
<script data-option="filename" data-value="Example request"></script>
<script type="text/plain" data-language="js">
let formData = {
'items': [{
'id': 36110175633573,
'quantity': 2
}]
};
fetch(window.Shopify.routes.root + 'cart/add.js', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(formData)
})
.then(response => {
return response.json();
})
.catch((error) => {
console.error('Error:', error);
});
</script>
</div>
</p>
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</div>
<script data-option="filename" data-value="Response"></script>
<script type="text/plain" data-language="json">
{
"items": [
{
"id": 36110175633573,
"title": "Red Rain Coat - Small",
"key": "794864229:03af7a8cb59a4c3c45595c76fa8cb53c",
"price": 12900,
"line_price": 12900,
"quantity": 2,
"sku": null,
"grams": 0,
"vendor": "Shopify",
"properties": {},
"variant_id": 794864229,
"gift_card": false,
"url": "/products/red-rain-coat?variant=794864229",
"featured_image": {
"url": "http://cdn.shopify.com/s/files/1/0040/7092/products/red-rain-coat.jpeg?v=1402604893",
"aspect_ratio": 1.0,
"alt": "Red rain coat with a hood"
},
"image": "http://cdn.shopify.com/s/files/1/0040/7092/products/red-rain-coat.jpeg?v=1402604893",
"handle": "red-rain-coat",
"requires_shipping": true,
"product_title": "Red Rain Coat",
"product_description": "A bright red rain coat for rainy days!",
"product_type": "Coat",
"properties" : null,
"variant_title": "Red",
"variant_options": ["Red"],
"options_with_values": [
{
"name": "Color",
"value": "Red"
}
]
}
]
}
</script>
</div>
</p>
</div>
</p>
Alternatively, you can use the [`FormData` constructor](https://developer.mozilla.org/en-US/docs/Web/API/FormData/FormData) and target the desired add-to-cart form:
```js
let addToCartForm = document.querySelector('form[action$="/cart/add"]');
let formData = new FormData(addToCartForm);
fetch(window.Shopify.routes.root + 'cart/add.js', {
method: 'POST',
body: formData
})
.then(response => {
return response.json();
})
.catch((error) => {
console.error('Error:', error);
});
```
### Response
The response for a successful `POST` request is a JSON object of the line items associated with the added items.
If an added item was already in the cart, then the `quantity` is equal to the new quantity for that cart line item. However, if the same items have differing prices, properties, or selling plans, then they'll be split into their own line items.
> Tip:
> Changes in price are typically the result of [automatic discounts](https://help.shopify.com/en/manual/discounts/automatic-discounts) or [Shopify Scripts](https://help.shopify.com/manual/checkout-settings/script-editor).
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</div>
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</div>
<script data-option="filename" data-value="Example data"></script>
<script type="text/plain" data-language="js">
items: [
{
id: 36323170943141,
quantity: 1
},
{
id: 36323170943141,
selling_plan: 6717605,
quantity: 1
}
]
</script>
</div>
</p>
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"url":"/products/great-granola-bar?selling_plan=6717605/u0026variant=36323170943141",
"featured_image":{
"aspect_ratio":1.504,
"alt":"Great Granola Bar",
"height":1277,
"url":"https://cdn.shopify.com/s/files/1/0401/3218/2181/products/fallon-michael-h2UH2674Bg4-unsplash.jpg?v=1600796940",
"width":1920
},
"image":"https://cdn.shopify.com/s/files/1/0401/3218/2181/products/fallon-michael-h2UH2674Bg4-unsplash.jpg?v=1600796940",
"handle":"great-granola-bar",
"requires_shipping":true,
"product_type":"",
"product_title":"Great Granola Bar",
"product_description":"The great granola bar, everyone has been talking about it. Subscribe when you can!",
"variant_title":null,
"variant_options":[
"Default Title"
],
"options_with_values":[
{
"name":"Title",
"value":"Default Title"
}
],
"line_level_discount_allocations":[ ],
"line_level_total_discount":0,
"selling_plan_allocation":{
"price_adjustments":[
{
"position":1,
"price":1700
}
],
"price":1700,
"compare_at_price":2000,
"per_delivery_price":1700,
"selling_plan":{
"id":6717605,
"name":"Delivered every week",
"description":null,
"options":[
{
"name":"Delivery every",
"position":1,
"value":"1 Week(s)"
}
],
"recurring_deliveries":true,
"price_adjustments":[
{
"order_count":null,
"position":1,
"value_type":"percentage",
"value":15
}
]
}
}
}
]
}
</script>
</div>
</p>
</div>
</p>
### Error responses
If the specified quantity for an item exceeds the available stock (e.g., attempting to add 20 items when only 10 are available), the cart will instead add the maximum available quantity. The error returned in JSON format is as follows:
```json
{
"status": 422,
"message": "Cart Error",
"description": "You can't add more #{item.name} to the cart."
}
```
If the product is entirely sold out, then the following error is returned:
```json
{
"status": 422,
"message": "Cart Error",
"description": "The product '#{item.name}' is already sold out."
}
```
If the product is not sold out, but all of its stock is in the cart, then the following error is returned:
```json
{
"status": 422,
"message": "Cart Error",
"description": "You can't add more #{item.name} to the cart."
}
```
### Add line item properties
You can add a variant to the cart with [line item properties](/docs/api/liquid/objects/line_item#line_item-properties) using the `properties` property. Its value must be an object of key-value pairs.
<p>
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</div>
</div>
</div>
<script data-option="filename" data-value="Request data"></script>
<script type="text/plain" data-language="js">
items: [
{
quantity: 1,
id: 794864229,
properties: {
'First name': 'Caroline'
}
}
]
</script>
</div>
</p>
<p>
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</div>
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<div class="react-code-block-preload-codeline-number"></div>
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</div>
</div>
</div>
<script data-option="filename" data-value="Response"></script>
<script type="text/plain" data-language="json">
{
"items": [
{
"id": 794864229,
"quantity": 1,
// ...
"properties" : {
"First name": "Caroline"
}
}
]
}
</script>
</div>
</p>
</div>
</p>
### Add a selling plan
You can add a variant with a [selling plan](/docs/api/liquid/objects/selling_plan) to the cart using the `selling_plan` parameter. Its value must be the [selling plan ID](/docs/api/liquid/objects/selling_plan#selling_plan-id).
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<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Request data"></script>
<script type="text/plain" data-language="js">
items: [
{
quantity: 1,
id: 794864229,
selling_plan: 183638
}
]
</script>
</div>
</p>
<p>
<div class="react-code-block" data-preset="file">
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</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Response"></script>
<script type="text/plain" data-language="json">
{
"items": [
{
"id": 794864229,
// ...
"selling_plan_allocation": {
"price": 3120,
"compare_at_price": 3900,
"per_delivery_price": 3120,
"selling_plan": {
"id": 183638,
"name": "Pay every month, delivery every month | save 20%",
"description": "No commitment · Auto-renews · Skip or cancel anytime",
"options": [{
"name": "Delivery Frequency",
"position": 1,
"value": "Month"
}, {
"name": "Billing Frequency",
"position": 2,
"value": "Month"
}],
"recurring_deliveries": true
}
}
}
]
}
</script>
</div>
</p>
</div>
</p>
## GET /{locale}/cart.js
Use the `GET /{locale}/cart.js` endpoint to get the cart as JSON.
All monetary properties are returned in the customer's presentment currency. To check the customer's presentment currency, you can use the `currency` field in the response. To learn more about selling in multiple currencies, refer to [Migrate your app to support multi-currency](/docs/api/admin-rest/latest/resources/transaction).
### Responses
#### JSON of a cart
```json
{
"token": "Z2NwLXVzLXdlc3QxOjAxSjBQTVk1Sjc5NVFKTjNOVlhLWENXQUI1?key=0d9909213054e22d092152de385763f0",
"note": "Hello!",
"attributes": {
"Gift wrap": "Yes"
},
"original_total_price": 3399,
"total_price": 2925,
"total_discount": 474,
"total_weight": 500,
"item_count": 2,
"items": [
{
"id": 39897499729985,
"properties": {},
"quantity": 1,
"variant_id": 39897499729985,
"key": "39897499729985:b1fca88d0e8bf5290f306f808785f744",
"title": "Health potion - S / Low",
"price": 900,
"original_price": 900,
"discounted_price": 900,
"line_price": 900,
"original_line_price": 900,
"total_discount": 0,
"discounts": [],
"sku": "",
"grams": 500,
"vendor": "Polina's Potent Potions",
"taxable": true,
"product_id": 6786188247105,
"product_has_only_default_variant": false,
"gift_card": false,
"final_price": 900,
"final_line_price": 900,
"url": "/products/health-potion?selling_plan=610435137&variant=39897499729985",
"featured_image": {
"aspect_ratio": 1.5,
"alt": "Health potion",
"height": 1233,
"url": "https://cdn.shopify.com/s/files/1/0561/7470/6753/files/science-beakers-blue-light-new.jpg?v=1683744744",
"width": 1850
},
"image": "https://cdn.shopify.com/s/files/1/0561/7470/6753/files/science-beakers-blue-light-new.jpg?v=1683744744",
"handle": "health-potion",
"requires_shipping": true,
"product_type": "Health",
"product_title": "Health potion",
"product_description": "Are you low on health? Well we've got the potion just for you!\nJust need a top up? Almost dead? In between? No need to worry because we have a range of sizes and strengths!",
"variant_title": "S / Low",
"variant_options": [
"S",
"Low"
],
"options_with_values": [
{
"name": "Size",
"value": "S"
},
{
"name": "Strength",
"value": "Low"
}
],
"line_level_discount_allocations": [],
"line_level_total_discount": 0,
"quantity_rule": {
"min": 1,
"max": null,
"increment": 1
},
"has_components": false,
"selling_plan_allocation": {
"price_adjustments": [
{
"position": 1,
"price": 900
}
],
"price": 900,
"compare_at_price": 1000,
"per_delivery_price": 900,
"selling_plan": {
"id": 610435137,
"name": "Delivery every 1 Week",
"description": null,
"options": [
{
"name": "1 Week(s), 4 Week(s)",
"position": 1,
"value": "1 Week(s)"
}
],
"recurring_deliveries": true,
"fixed_selling_plan": false,
"price_adjustments": [
{
"order_count": null,
"position": 1,
"value_type": "percentage",
"value": 10
}
]
}
}
},
{
"id": 39888235757633,
"properties": {},
"quantity": 1,
"variant_id": 39888235757633,
"key": "39888235757633:264890389795b468fe7b11339ff91c08",
"title": "Whole bloodroot",
"price": 2499,
"original_price": 2499,
"discounted_price": 2025,
"line_price": 2025,
"original_line_price": 2499,
"total_discount": 474,
"discounts": [
{
"amount": 250,
"title": "Bloodroot discount!"
},
{
"amount": 224,
"title": "Ingredient Sale"
}
],
"sku": "",
"grams": 0,
"vendor": "Clover's Apothecary",
"taxable": true,
"product_id": 6792596455489,
"product_has_only_default_variant": true,
"gift_card": false,
"final_price": 2249,
"final_line_price": 2249,
"url": "/products/bloodroot-whole?variant=39888235757633",
"featured_image": {
"aspect_ratio": 1.5,
"alt": "Whole bloodroot",
"height": 2973,
"url": "https://cdn.shopify.com/s/files/1/0561/7470/6753/products/sweet-potato-pile.jpg?v=1650644893",
"width": 4460
},
"image": "https://cdn.shopify.com/s/files/1/0561/7470/6753/products/sweet-potato-pile.jpg?v=1650644893",
"handle": "bloodroot-whole",
"requires_shipping": true,
"product_type": "Fruits & Vegetables",
"product_title": "Whole bloodroot",
"product_description": "",
"variant_title": null,
"variant_options": [
"Default Title"
],
"options_with_values": [
{
"name": "Title",
"value": "Default Title"
}
],
"line_level_discount_allocations": [
{
"amount": 250,
"discount_application": {
"type": "script",
"key": "10a5c368-efe2-4d60-9082-9e6c298759e8",
"title": "Bloodroot discount!",
"description": null,
"value": "2.5",
"created_at": "2023-11-07T18:21:24.074Z",
"value_type": "fixed_amount",
"allocation_method": "across",
"target_selection": "explicit",
"target_type": "line_item",
"total_allocated_amount": 250
}
}
],
"line_level_total_discount": 250,
"quantity_rule": {
"min": 1,
"max": null,
"increment": 1
},
"has_components": false,
"unit_price": 4050,
"unit_price_measurement": {
"measured_type": "weight",
"quantity_value": "500.0",
"quantity_unit": "g",
"reference_value": 1,
"reference_unit": "kg"
}
}
],
"requires_shipping": true,
"currency": "CAD",
"items_subtotal_price": 3149,
"cart_level_discount_applications": [
{
"type": "automatic",
"key": "468373bf-8996-41ee-b735-790f915179f9",
"title": "Ingredient Sale",
"description": "",
"value": "10.0",
"created_at": "2023-11-07T18:20:58.649Z",
"value_type": "percentage",
"allocation_method": "across",
"target_selection": "all",
"target_type": "line_item",
"total_allocated_amount": 224
}
]
}
```
#### JSON of an empty cart
```json
{
"token": "Z2NwLXVzLXdlc3QxOjAxSjBQTVk1Sjc5NVFKTjNOVlhLWENXQUI1?key=0d9909213054e22d092152de385763f0",
"note": null,
"attributes": {},
"original_total_price": 0,
"total_price": 0,
"total_discount": 0,
"total_weight": 0,
"item_count": 0,
"items": [],
"requires_shipping": false,
"currency": "CAD",
"items_subtotal_price": 0,
"cart_level_discount_applications": []
}
```
> Tip:
> If you want to empty an existing cart, then use the `/{locale}/cart/clear` endpoint.
## POST /{locale}/cart/update.js
Use the `POST /{locale}/cart/update.js` endpoint to update the cart's line item quantities, note, or attributes. You can submit a serialized cart form, or submit separate updates to a cart's line items, note, or attributes.
### Update line item quantities
To update line item quantities, you can make a `POST` request with an `updates` object. The `updates` object must contain key-value pairs where the value is the desired quantity, and the key is one of the following:
- The line item's [`variant_id`](/docs/api/liquid/objects/line_item#line_item-variant_id)
- The line item's [`key`](/docs/api/liquid/objects/line_item#line_item-key)
```js
let updates = {
794864053: 2,
794864233: 3
};
fetch(window.Shopify.routes.root + 'cart/update.js', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ updates })
})
.then(response => {
return response.json();
})
.catch((error) => {
console.error('Error:', error);
});
```
A cart can have multiple line items that share the same `variant_id`. For example, when variants have different [line item properties](/docs/api/liquid/objects/line_item#line_item-properties), or [automatic discounts](https://help.shopify.com/en/manual/discounts/automatic-discounts) create variants at different prices. Because of this, it's recommended to use the line item key to ensure that you're only changing the intended line item.
The line item key is not persistent for the lifetime of a line item, it changes as characteristics of the line item change. This includes, but is not limited to, properties and discount applications.
> Note:
> If you use the variant ID, then the key can be either an integer or a string. However, if you use the line item key, then the key needs to be a string.
The following `POST` request yields the same result:
```js
var formData = new FormData();
formData.append("updates[794864053]", 2);
formData.append("updates[794864233]", 3);
fetch(window.Shopify.routes.root + 'cart/update.js', {
method: 'POST',
body: formData
})
.then(response => response.json())
.then(data => console.log(data));
```
The `/{locale}/cart/update.js` endpoint adds new line items to the cart if the `variant_id` provided doesn't match any line item already in the cart. However, if the `variant_id` matches multiple line items, then the first matching line item is updated.
> Tip:
> Use the `change.js` endpoint when changing line items that are already in the cart, and the `add.js` endpoint when adding new line items.
You can remove items from the cart by setting the quantity to 0:
```js
let updates = {
794864053: 0,
794864233: 0
};
fetch(window.Shopify.routes.root + 'cart/update.js', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ updates })
})
.then(response => {
return response.json();
})
.catch((error) => {
console.error('Error:', error);
});
```
You can also submit an array of numbers to `/{locale}/cart/update.js`, provided the size of the array matches the number of line items in the cart. Each number in the array sets the quantity for the corresponding line item in the cart. For example, if you have 3 line items in the cart with quantities 1, 2, and 3, and you want to change those quantities to 3, 2, and 1, then you can use the following:
```js
fetch(window.Shopify.routes.root + 'cart/update.js', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ updates: [3, 2, 1] })
})
.then(response => response.json())
.then(data => console.log(data));
```
### Update the cart note
To update the cart note, you can make a `POST` request with a `note` character string:
```js
{
note: 'This is a note about my order'
}
```
### Update cart attributes
To update cart attributes, you can make a `POST` request with an `attributes` object. The `attributes` object must contain key-value pairs where the `key` is the name of the attribute you want to update, and the value is the attribute value:
```js
{
attributes: {
'Gift wrap': 'Yes'
}
}
```
The following `POST` request yields the same result:
```js
var formData = new FormData();
formData.append("attributes[Gift wrap]", "Yes");
fetch(window.Shopify.routes.root + 'cart/update.js', {
method: 'POST',
body: formData
})
.then(response => response.json())
.then(data => console.log(data));
```
### Response
The JSON of the cart.
### Error responses
If a variant ID is provided that either doesn't exist or isn't available in the online store channel, then the endpoint returns the following error:
```js
{
"status": 404,
"message": "Cart Error"
"description": "Cannot find variant"
}
```
> Caution:
> The `update.js` endpoint doesn't validate the quantity on variants that are already in the cart. This means that it's possible to add more inventory than is available.
## POST /{locale}/cart/change.js
Use the `/{locale}/cart/change.js` endpoint to change the `quantity`, `properties`, and `selling_plan` properties of a cart line item. Only items already in your cart can be changed, and you can change only one line item at a time.
### Identify the line item to change
The `POST` data requires either an `id` or `line` property to identify the line item to be changed.
#### The `id` property
The value of the `id` property can be one of the following:
- The line item's [`variant_id`](/docs/api/liquid/objects/line_item#line_item-variant_id)
- The line item's [`key`](/docs/api/liquid/objects/line_item#line_item-key)
<p>
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</div>
<script type="text/plain" data-language="js" data-title="Variant ID">
{
'id': 794864053,
'quantity': 3
}
</script>
<script type="text/plain" data-language="js" data-title="Line item key">
{
'id': '794864053:83503fd282b94a4737d2c95bd95db0b8',
'quantity': 3
}
</script>
</div>
</p>
A cart can have multiple line items that share the same `variant_id`. For example, when variants have different [line item properties](/docs/api/liquid/objects/line_item#line_item-properties), or [automatic discounts](https://help.shopify.com/en/manual/discounts/automatic-discounts) create variants at different prices. Because of this, it's recommended to use the line item key to ensure that you're only changing the intended line item.
> Note:
> If you use the variant ID, then the `id` value can be either an integer or a string. However, if you use the line item key, then the `id` value needs to be a string.
#### The `line` property
A cart can have multiple line items that share the same `variant_id`. For example, when variants have different [line item properties](/docs/api/liquid/objects/line_item#line_item-properties), or [automatic discounts](https://help.shopify.com/en/manual/discounts/automatic-discounts) create variants at different prices. To account for this, you can use the `line` property when updating the cart.
The value of `line` is the 1-based index position of the item in the cart.
```js
{
'line': 1,
'quantity': 3
}
```
### Update quantities
The value of the`quantity` property represents the new quantity you want for the line item. It must be an integer.
```js
{
'line': 2,
'quantity': 1
}
```
You can remove a line item by setting the `quantity` to `0`:
```js
{
'line': 2,
'quantity': 0
}
```
### Update properties
The `properties` property sets the [line item properties](/docs/api/liquid/objects/line_item#line_item-properties). Its value must be an object of key-value pairs.
```js
{
'line': 2,
'properties': { 'gift_wrap': true }
}
```
Whenever a `POST` request includes `properties`, it overwrites the entire `properties` object. Any key-value pairs that were already in the `properties` object are erased.
It's not possible to set a line item's `properties` property to an empty object once a value is set. If you need to remove all line item properties, then you need to remove the entire line item.
> Tip:
> You can visually hide line item properties at checkout by creating [private properties](#private-properties-and-attributes). This technique might be an alternative to removing a line item when managing `properties`.
### Update selling plans
The `selling_plan` property sets the [line item selling plan](/docs/api/liquid/objects/line_item#line_item-selling_plan_allocation). Its value must be one of the following:
- The [selling plan ID](/docs/api/liquid/objects/selling_plan#selling_plan-id): To set a specific selling plan for the line item.
- `null` or an empty string: To remove any selling plan from the line item.
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<script type="text/plain" data-language="js" data-title="Add selling plan">
{
'line': 2,
'quantity': 2,
'selling_plan': 183638
}
</script>
<script type="text/plain" data-language="js" data-title="Remove selling plan">
{
'line': 2,
'quantity': 2,
'selling_plan': null
}
</script>
</div>
</p>
> Note:
> When specifying the `selling_plan` property, consider the following:
>
> - You can use only the [`line` property](#the-line-property) for identifying the line item.
> - You should always specify the `quantity` property. If the `quantity` isn't specified, then it's assumed to be 1.
### Response
The JSON of the cart.
### Error responses
If the item that you're attempting to change isn't already in the cart, then `/{locale}/cart/change.js` doesn't add it. Instead, it returns a `400` error:
```json
{
"status": "bad_request",
"message": "no valid id or line parameter",
"description": "no valid id or line parameter"
}
```
## POST /{locale}/cart/clear.js
Use the `POST /{locale}/cart/clear.js` endpoint to set all quantities of all line items in the cart to zero.
### Response
The JSON of an empty cart. This does not remove cart attributes or the cart note.
```json
{
"token": "Z2NwLXVzLXdlc3QxOjAxSjBQTVk1Sjc5NVFKTjNOVlhLWENXQUI1?key=0d9909213054e22d092152de385763f0",
"note": null,
"attributes": {},
"total_price": 0,
"total_weight": 0,
"item_count": 0,
"items": [],
"requires_shipping": false
}
```
## Generate shipping rates
Use the `POST /{locale}/cart/prepare_shipping_rates.json` and `GET /{locale}/cart/async_shipping_rates.json` endpoints to generate shipping rates:
- The `POST /{locale}/cart/prepare_shipping_rates.json` endpoint initiates the process of calculating shipping rates for the cart given a destination.
- The `GET /{locale}/cart/async_shipping_rates.json` endpoint returns the shipping rates results if the calculations have finished.
### Example `prepare_shipping_rates` call
```text
/{locale}/cart/prepare_shipping_rates.json?shipping_address%5Bzip%5D=K1N+5T2&shipping_address%5Bcountry%5D=Canada&shipping_address%5Bprovince%5D=Ontario
```
#### Response
`null`
### Example `async_shipping_rates` call
```text
/{locale}/cart/async_shipping_rates.json?shipping_address%5Bzip%5D=K1N+5T2&shipping_address%5Bcountry%5D=Canada&shipping_address%5Bprovince%5D=Ontario
```
<details class="details">
<summary class="details__summary marketing-button">
<span>View response</span>
</summary>
<p>If you call <code class="text-highlight text-highlight--grey">async_shipping_rates</code> with the same parameters as <code class="text-highlight text-highlight--grey">prepare_shipping_rates</code>, then it checks whether Shopify has finished calculating the rates. If the shipping rates aren't ready, then the response is <code class="text-highlight text-highlight--grey">null</code>.</p>
<p>If the shipping rates are ready, the rates are returned:</p>
<p>
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<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script type="text/plain" data-language="json">
{
"shipping_rates": [
{
"name": "Generic Rate",
"presentment_name": "Generic Rate",
"code": "Generic Rate",
"price": "6.00",
"markup": null,
"source": "shopify",
"delivery_date": null,
"delivery_range": null,
"delivery_days": [],
"compare_price": null,
"phone_required": false,
"currency": null,
"carrier_identifier": null,
"delivery_category": null,
"using_merchant_account": null,
"carrier_service_id": null,
"description": null,
"api_client_id": null,
"requested_fulfillment_service_id": null,
"shipment_options": null,
"charge_items": null,
"has_restrictions": null,
"rating_classification": null,
"accepts_instructions": false
},
{
"name": "Carrier Service Mail",
"presentment_name": "Carrier Service Mail",
"code": "CarrierServiceMail",
"price": "12.46",
"markup": "0.00",
"source": "usps",
"delivery_date": "2020-10-09",
"delivery_range": [
"2020-10-06",
"2020-10-09"
],
"delivery_days": [
0,
3
],
"compare_price": null,
"phone_required": true,
"currency": null,
"carrier_identifier": null,
"delivery_category": null,
"using_merchant_account": null,
"carrier_service_id": 2,
"description": null,
"api_client_id": null,
"requested_fulfillment_service_id": null,
"shipment_options": null,
"charge_items": null,
"has_restrictions": null,
"rating_classification": null,
"accepts_instructions": false
}
]
}
</script>
</div>
</p>
</details>
### GET /{locale}/cart/shipping_rates.json
Use the `GET /{locale}/cart/shipping_rates.json` to get estimated shipping rates.
> Note:
> The recommended method to generate shipping rates is to use the `POST /{locale}/cart/prepare_shipping_rates.json` and `GET /{locale}/cart/async_shipping_rates.json` endpoints because it might take a while for shipping rates to be returned. The `GET /{locale}/cart/shipping_rates.json` endpoint is subject to throttling.
```text
/{locale}/cart/shipping_rates.json?shipping_address%5Bzip%5D=K1N+5T2&shipping_address%5Bcountry%5D=Canada&shipping_address%5Bprovince%5D=Ontario
```
<details class="details">
<summary class="details__summary marketing-button">
<span>View response</span>
</summary>
<p>
<div class="react-code-block" data-preset="basic">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar basic-codeblock"></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script type="text/plain" data-language="json">
{
"shipping_rates": [
{
"name": "Ground Shipping",
"price": "8.00",
"delivery_date": null,
"source": "shopify"
},
{
"name": "Expedited Shipping",
"price": "15.00",
"delivery_date": null,
"source": "shopify"
},
{
"name": "Express Shipping",
"price": "30.00",
"delivery_date": null,
"source": "shopify"
}
]
}
</script>
</div>
</p>
</details>
## Private properties and attributes
Private line item properties and private cart attributes are used when you need to attach information to either cart line items or the entire cart, and you don't want the properties and attributes to be visible to the online store's visitors.
Both private properties and private cart attributes are visually hidden at checkout, but are visible on the **Order details** page in the Shopify admin.
> Caution:
> If you hide private line item properties on the storefront, then you must [modify your theme's codebase](#hide-properties-in-a-theme).
### Private line item properties
To make a line item property private, prepend an underscore (`_`) to the key. For example, to add a variant to cart with a private `_foo` property using the `/{locale}/cart/add.js` endpoint:
```js
items: [
{
'quantity': 2,
'id': 794864229,
'properties': {
'_foo': 'bar'
}
}
]
```
The `properties` property can have a mix of private and public line item properties:
```js
items: [
{
quantity: 2,
id: 794864229,
properties: {
'_foo': 'bar',
'gift_wrap': true
}
}
]
```
#### Hide properties in a theme
Private line item properties are available in the Liquid [`line_item.properties`](/docs/api/liquid/objects/line_item#line_item-properties) object and Ajax API. To hide private properties on the storefront, you must modify the theme's codebase.
In the following example, all `properties` items that begin with `_` in Liquid are filtered out:
<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Liquid"></script>
<script type="text/plain" data-language="liquid">
{% for property in line_item.properties %}
{% assign first_character_in_key = property.first | slice: 0 %}
{% unless first_character_in_key == '_' %}
{{ property.first }}: {{ property.last }}
{% endunless %}
{% endfor %}
</script>
</div>
</p>
### Private cart attributes
To make a cart attribute private, append a double underscore (`__`) to an attribute name.
Private cart attributes are not available in the Liquid [`cart.attributes`](/docs/api/liquid/objects/cart#cart-attributes) object or the Ajax API. This means there is no code modification required to hide them in theme files. Private cart attributes also do not affect the page rendering, which allows for more effective page caching.
## Bundled section rendering
Bundled section rendering allows you to request the HTML markup for up to five sections you might want to update based on an initial call to the Cart API, within that same call.
Bundled section rendering is available for the following Cart API endpoints:
- `/{locale}/cart/add`
- `/{locale}/cart/change`
- `/{locale}/cart/clear`
- `/{locale}/cart/update`
### Request sections
To request sections, you can include a `sections` parameter in your API call data:
<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Example"></script>
<script type="text/plain" data-language="json">
items: [
{
id: 36110175633573,
quantity: 2
}
],
sections: "cart-items,cart-icon-bubble,cart-live-region-text,cart-footer"
</script>
</div>
</p>
> Note:
> The `sections` parameter can be a comma-separated list or an array, similar to when using the [Section Rendering API](/docs/api/ajax/section-rendering) directly.
By default, sections are rendered in the context of the current page, based on the [HTTP Referer](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referer) header. However, you can specify any other page using the `sections_url` parameter. The `sections_url` must begin with a `/` and can include query parameters like `q` and `page`.
<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Example"></script>
<script type="text/plain" data-language="json">
sections: "cart-items,cart-icon-bubble,cart-live-region-text,cart-footer",
sections_url: "/cart?some_param=foo"
</script>
</div>
</p>
The HTML for the requested sections is included under the `sections` key of the returned JSON. Each section can be identified by the same ID that was passed in the request.
<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
</div>
</div>
<script data-option="filename" data-value="Example"></script>
<script type="text/plain" data-language="json">
{
attributes: {},
cart_level_discount_applications: [],
currency: "CAD",
item_count: 1,
items: [{…}],
items_subtotal_price: 100100,
note: null,
original_total_price: 100100,
requires_shipping: true,
sections: {
cart-items: "<div id=\"shopify-section-template--14199693705272_…9930913703934\" defer=\"defer\"></script>\n\n\n\n\n</div>",
cart-icon-bubble: "<div id=\"shopify-section-cart-icon-bubble\" class=\"…ss=\"visually-hidden\">1 item</span>\n </div></div>",
cart-live-region-text: "<div id=\"shopify-section-cart-live-region-text\" cl…opify-section\">New subtotal: $1,001.00 CAD\n</div>",
cart-footer: "<div id=\"shopify-section-template--14199693705272_… </div>\n </div>\n </div>\n</div>\n\n\n\n\n\n\n</div>"
},
token: "Z2NwLXVzLXdlc3QxOjAxSjBQTVk1Sjc5NVFKTjNOVlhLWENXQUI1?key=0d9909213054e22d092152de385763f0",
total_discount: 0,
total_price: 100100,
total_weight: 1000,
}
</script>
</div>
</p>
### Error response
Sections are rendered after the data modifications from the request are completed. Because of this, rendering errors don't affect the response status of the API call. Sections that fail to render are returned as `null`, so you should account for this possibility.
Passing invalid values for the `sections` or `sections_url` parameters, such as a `sections_url` that doesn't begin with `/`, causes the entire request to return an **HTTP 400 Bad Request** status. However, this doesn’t mean that the rest of the request didn’t succeed.