Shopify Storefront Cart

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/shopify-storefront/json-schema/shopify-storefront-cart-schema.json",
  "title": "Shopify Storefront Cart",
  "description": "Schema for a Shopify cart as managed by the Storefront GraphQL API",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Global cart ID in gid://shopify/Cart/{token} format"
    },
    "checkoutUrl": {
      "type": "string",
      "format": "uri",
      "description": "URL to proceed to the Shopify-hosted checkout"
    },
    "totalQuantity": {
      "type": "integer",
      "description": "Total number of items across all cart lines"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "When the cart was created"
    },
    "updatedAt": {
      "type": "string",
      "format": "date-time",
      "description": "When the cart was last updated"
    },
    "note": {
      "type": ["string", "null"],
      "description": "A note that the buyer provides on the cart"
    },
    "attributes": {
      "type": "array",
      "description": "Custom attributes for the cart",
      "items": {
        "type": "object",
        "properties": {
          "key": { "type": "string" },
          "value": { "type": "string" }
        }
      }
    },
    "discountCodes": {
      "type": "array",
      "description": "Discount codes applied to the cart",
      "items": {
        "type": "object",
        "properties": {
          "code": { "type": "string" },
          "applicable": { "type": "boolean" }
        }
      }
    },
    "cost": {
      "type": "object",
      "description": "The costs that the buyer will pay at checkout",
      "properties": {
        "totalAmount": {
          "type": "object",
          "properties": {
            "amount": { "type": "string" },
            "currencyCode": { "type": "string" }
          }
        },
        "subtotalAmount": {
          "type": "object",
          "properties": {
            "amount": { "type": "string" },
            "currencyCode": { "type": "string" }
          }
        },
        "totalTaxAmount": {
          "type": ["object", "null"],
          "properties": {
            "amount": { "type": "string" },
            "currencyCode": { "type": "string" }
          }
        },
        "totalDutyAmount": {
          "type": ["object", "null"],
          "properties": {
            "amount": { "type": "string" },
            "currencyCode": { "type": "string" }
          }
        }
      }
    },
    "lines": {
      "type": "object",
      "description": "Items in the cart",
      "properties": {
        "edges": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "node": {
                "type": "object",
                "description": "A cart line item",
                "properties": {
                  "id": { "type": "string" },
                  "quantity": { "type": "integer" },
                  "merchandise": {
                    "type": "object",
                    "description": "The product variant",
                    "properties": {
                      "id": { "type": "string" },
                      "title": { "type": "string" },
                      "price": {
                        "type": "object",
                        "properties": {
                          "amount": { "type": "string" },
                          "currencyCode": { "type": "string" }
                        }
                      },
                      "product": {
                        "type": "object",
                        "properties": {
                          "id": { "type": "string" },
                          "title": { "type": "string" },
                          "handle": { "type": "string" }
                        }
                      }
                    }
                  },
                  "cost": {
                    "type": "object",
                    "properties": {
                      "totalAmount": {
                        "type": "object",
                        "properties": {
                          "amount": { "type": "string" },
                          "currencyCode": { "type": "string" }
                        }
                      },
                      "amountPerQuantity": {
                        "type": "object",
                        "properties": {
                          "amount": { "type": "string" },
                          "currencyCode": { "type": "string" }
                        }
                      }
                    }
                  },
                  "attributes": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "properties": {
                        "key": { "type": "string" },
                        "value": { "type": "string" }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}