Swift parse object to JSON object

I am using shopify iOS SDK(mobile-buy-sdk-ios) in react native to get login user's orders.Here is my code,

let query = Storefront.buildQuery { $0        .customer(customerAccessToken: token) { $0          .orders(first: count, reverse: true) { $0                .edges { $0                    .node { $0                      .id()                      .orderNumber()                      .totalPrice()                      .statusUrl()                      .lineItems(first: 25){ $0                          .edges{ $0                              .node{ $0                                  .title()                                  .quantity()                                  .variant{ $0                                      .id()                                      .price()                                      .title()                                      .image{ $0                                          .originalSrc()                                      }                                  }                              }                          }                      }    let task  = self.client.queryGraphWith(query, cachePolicy: .networkOnly) { response, error in     error.debugUserPrint()     let userOrders = response.customer?.orders.edges[0].node;     let res = try! JSONSerialization.data(withJSONObject: userOrders)     completion([res])}

And I am getting this response in userOrders variable

<QueryRoot: ["customer": {    orders =     {        edges =         (                        {                node =                 {                    id = "Z2lkOi8vc2hvcGlmeS9PcmRlci8yMjY2NTM3NzU0NzEwP2tleT0zNWFiYzBkMjRmMDk3MjZlYzgzYjkwZDVlZGI5YjM4MA==";                    lineItems =                     {                        edges =                         (                                                        {                                node =                                 {                                    quantity = 1;                                    title = "Gift wrapping";                                    variant =                                     {                                        id = "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC8xMjE3MzkzNjYyMzcwMg==";                                        image =                                         {                                            originalSrc = "https://cdn.shopify.com/s/files/1/2331/3377/products/Gift_Boxes_11_22_2017_Standard_1024x1024_60d01a1c-f665-4c9e-b80b-f6fda9167de3.jpg?v=1521444032";                                        };                                        price = "10.00";                                        title = "Default Title";                                    };                                };                            }                        );                    };                    orderNumber = 1040;                    statusUrl = "23313377/orders/11f378e7df2731521429f377015d2ec2/authenticate?key=35abc0d24f09726ec83b90d5edb9b380";                    totalPrice = "10.00";                };            }        );    };}]>)

this formate, so try to parse this data to JSON object to pass data from iOS function to javascript function. I have tried

JSONSerialization.data(withJSONObject: userOrders)

but it is not working. I just want to parse this data to JSON. I have also tried many other ways but no luck.

Thanks.