GET /cart

The GET /cart?_format=json endpoint will return a collection of the current user's carts. An example request call would look like the following

fetch(Drupal.url(`cart?_format=json`), {
    // By default cookies are not passed, and we need the session cookie!
    credentials: 'include'
})
.then((res) => {
    return res.json();
})
.then((json) => {
    console.log(json);
});

The returned JSON will resemble the following response

[
  {
    "order_id": 2,
    "uuid": "be9cb309-2c77-4f85-9444-013c91ab9318",
    "order_number": null,
    "store_id": 1,
    "total_price": {
      "number": "403.97",
      "currency_code": "USD"
    },
    "order_items": [
      {
        "order_item_id": 9,
        "uuid": "dcaa6901-f799-4505-af4c-9d1db9a85bbb",
        "type": "physical_product_variation",
        "purchased_entity": 4,
        "title": "Drupal Commerce Hoodie - Green, Small",
        "quantity": "2.00",
        "unit_price": {
          "number": "52.00",
          "currency_code": "USD"
        },
        "total_price": {
          "number": "104.00",
          "currency_code": "USD"
        }
      },
      {
        "order_item_id": 21,
        "uuid": "3bb80d13-ec7d-4e69-af33-a2f014c5e284",
        "type": "physical_product_variation",
        "purchased_entity": 15,
        "title": "Pronto600 Instant Camera",
        "quantity": "3.00",
        "unit_price": {
          "number": "99.99",
          "currency_code": "USD"
        },
        "total_price": {
          "number": "299.97",
          "currency_code": "USD"
        }
      }
    ]
  }
]