Remove from Cart

curl --request POST \
  --url https://your-store.launchmystore.io/cart/change.js \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "line": 123,
  "id": {},
  "key": "<string>",
  "quantity": 123,
  "properties": {}
}
'

import requests

url = "https://your-store.launchmystore.io/cart/change.js"

payload = {
    "line": 123,
    "id": {},
    "key": "<string>",
    "quantity": 123,
    "properties": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({line: 123, id: {}, key: '<string>', quantity: 123, properties: {}})
};

fetch('https://your-store.launchmystore.io/cart/change.js', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://your-store.launchmystore.io/cart/change.js",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'line' => 123,
    'id' => [
        
    ],
    'key' => '<string>',
    'quantity' => 123,
    'properties' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://your-store.launchmystore.io/cart/change.js"

	payload := strings.NewReader("{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://your-store.launchmystore.io/cart/change.js")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://your-store.launchmystore.io/cart/change.js")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}"

response = http.request(request)
puts response.read_body

POST

cart

change.js

Remove from Cart

curl --request POST \
  --url https://your-store.launchmystore.io/cart/change.js \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "line": 123,
  "id": {},
  "key": "<string>",
  "quantity": 123,
  "properties": {}
}
'

import requests

url = "https://your-store.launchmystore.io/cart/change.js"

payload = {
    "line": 123,
    "id": {},
    "key": "<string>",
    "quantity": 123,
    "properties": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({line: 123, id: {}, key: '<string>', quantity: 123, properties: {}})
};

fetch('https://your-store.launchmystore.io/cart/change.js', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://your-store.launchmystore.io/cart/change.js",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'line' => 123,
    'id' => [
        
    ],
    'key' => '<string>',
    'quantity' => 123,
    'properties' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://your-store.launchmystore.io/cart/change.js"

	payload := strings.NewReader("{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://your-store.launchmystore.io/cart/change.js")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://your-store.launchmystore.io/cart/change.js")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"line\": 123,\n  \"id\": {},\n  \"key\": \"<string>\",\n  \"quantity\": 123,\n  \"properties\": {}\n}"

response = http.request(request)
puts response.read_body

Remove from Cart

Removes an item from the cart or changes its quantity.

Cart change is a storefront surface, not part of the OAuth /api/v1 app API. It follows the Shopify-AJAX cart contract: requests are made against the storefront origin (your store domain), identity is the cart cookie token (not a Bearer access token), and the response is the flat Shopify cart object — not wrapped in a { status, type, data } envelope.

Request

curl -X POST "https://your-store.launchmystore.io/cart/change.js" \
  -H "Content-Type: application/json" \
  -H "Cookie: cart=c1-xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx" \
  -d '{
    "line": 1,
    "quantity": 0
  }'

const response = await fetch('/cart/change.js', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    line: 1,
    quantity: 0  // Remove item
  })
});
const cart = await response.json();

Body Parameters

Use one of the following to identify the item:

line

integer

Line item index (1-based)

string | integer

Variant ID of the line to change

key

string

Line item key ({variant_id}:{hash}, as returned in the cart items)

quantity

integer

required

New quantity. Set to 0 to remove the item.

properties

object

Update custom properties (when identifying by variant ID, properties help pinpoint the specific line item)

A legacy browser pattern is also supported: GET /cart/change?id={variantId}&quantity={qty} (or line=). It applies the change and then redirects (HTTP 302) to /cart.

Response

The response is the flat Shopify cart object (the same shape returned by Get Cart), reflecting the updated cart after the change.

Example Response

{
  "token": "c1-9a3f0c2e-7b1d-4e8a-9f2c-1a2b3c4d5e6f",
  "items": [
    {
      "key": "640001:default",
      "id": 640001,
      "product_id": 12044,
      "variant_id": 640001,
      "title": "Baseball Cap",
      "variant_title": "One Size / Navy",
      "quantity": 1,
      "price": 1500,
      "line_price": 1500
    }
  ],
  "item_count": 1,
  "total_price": 1500,
  "currency": "USD",
  "note": "",
  "attributes": {}
}

Remove by Variant ID

When the same variant appears multiple times (with different properties), use properties to identify which one to change:

{
  "id": 640900,
  "quantity": 0,
  "properties": {
    "Engraving": "Happy Birthday!"
  }
}

Errors

On failure the endpoint returns a Shopify-style error body with the real HTTP status:

{
  "status": 404,
  "message": "Cart or line item not found",
  "description": "Cart or line item not found"
}

Update Cart Clear Cart

​Remove from Cart

​Request

​Body Parameters

​Response

​Example Response

​Remove by Variant ID

​Errors

Remove from Cart

Request

Body Parameters

Response

Example Response

Remove by Variant ID

Errors