How to remove extra json object in flutter

Question

This is my cart list and I'm converting into JSON object to send at the server

   Map<String,dynamic> str={'cart':cartList};
      cartitem = jsonEncode(str);

doing something like this but it is adding extra JSON object and this is invalid JSON form. then how can I remove extra JSON object.

 {
    {"cart":[
    {
    "cartid":2,
    "pid":"342702",
    "merchantId":"MER-07156",
    "hashkey":"7087fea71afc963d6dc3fa04944008ec",
    "productname":"Scheduling Product - Edit Please",
    "product_image":"Scheduling Product - Edit Please",
    "shipping_price":"0.00",
    "state_tax_rate":"0.0",
    "taxamt":"0.00",
    "discountamt":"0.0",
    "price":"10.00",
    "pricewithattr":"17.00",
    "quantity":"18",
    "totalamount":"306.00",
    "taxvalue":"0.0",
    "attribute_array":"[{\"attributeid\":\"20796\",\"attributename\":\"Black\",\"groupname\":\"Color\",\"groupid\":\"3012\"},{\"attributeid\":\"20798\",\"attributename\":\"Silk\",\"groupname\":\"Cloth\",\"groupid\":\"3013\"},{\"attributeid\":\"20800\",\"attributename\":\"small\",\"groupname\":\"Size\",\"groupid\":\"3014\"}]",
    "is_free":"0",
    "is_payable_later":"0",
    "isattrpresent":"1"
    }
    ]
    }}

did you try this? cartitem.replace("{{","{"); cartitem.replace("}}","}"); — Muhammad Imran, Apr 24 '19 at 11:45

score 1 · Answer 1 · answered Apr 24 '19 at 12:46

1

Strange, because this code:

  Map<String, dynamic> str = {
    'cart': [1, 2, 3]
  };
  String cartitem = jsonEncode(str);
  print(cartitem);

which does basically the same thing, produces valid json:

{"cart":[1,2,3]}

Try debugging by just json encoding one of the cart members, replacing the cart members by something simple (like an integer, above) until you find the issue.

answered Apr 24 '19 at 12:46

Richard Heap

48,344
9
130
112

I tried to debug and found that `jsonEncode` was adding an extra object so I converted `cartiem` into `jsonEncode` prior to adding into the map. – Farhana Naaz Ansari Apr 25 '19 at 05:12

score 0 · Answer 2 · answered Apr 24 '19 at 13:38

0

Your JSON is not right structure. Did you try to parse it any online converter?

You should remove { character before "cart" and remove } character the end of json.

answered Apr 24 '19 at 13:38

Enis Erkaya

71
2
6

1

The JSON is indeed invalid, but was supposedly created by `jsonEncode`. Is this a serious bug in `jsonEncode` or some other error. We don't know yet. – Richard Heap Apr 24 '19 at 20:41
@RichardHeap exactly may be the serious bug in `jsonEncode` i tried this by adding double quotes in the cart key and it works. – Farhana Naaz Ansari Apr 25 '19 at 05:16
@RichardHeap see my answer how I get the expected result. I don't know the way I used is correct or not. – Farhana Naaz Ansari Apr 25 '19 at 05:24

score 0 · Accepted Answer · answered Apr 25 '19 at 05:21

I tried to debug and found that jsonEncode was adding an extra object so I converted cartiem into jsonEncode prior to adding into the map.

  var cartitems2=cartList;
  Map<String,dynamic> str={'"cart"':json.encode(cartitems2)};
  cartitem = str.toString();
  debugPrint('CART :-----${cartitem}');

Expected Result

{
    "cart": [
        {
            "cartid": 22,
            "pid": "342702",
            "merchantId": "MER-07156",
            "hashkey": "7087fea71afc963d6dc3fa04944008ec",
            "productname": "Scheduling Product - Edit Please",
            "product_image": "Scheduling Product - Edit Please",
            "shipping_price": "0.00",
            "state_tax_rate": "0.0",
            "taxamt": "0.00",
            "discountamt": "0.0",
            "price": "10.00",
            "pricewithattr": "26.00",
            "quantity": "10",
            "totalamount": "260.00",
            "taxvalue": "0.0",
            "attribute_array": [
                {
                    "attributeid": "20794",
                    "attributename": "Red",
                    "groupname": "Color",
                    "groupid": "3012"
                },
                {
                    "attributeid": "20799",
                    "attributename": "Cotton",
                    "groupname": "Cloth",
                    "groupid": "3013"
                },
                {
                    "attributeid": "20800",
                    "attributename": "small",
                    "groupname": "Size",
                    "groupid": "3014"
                }
            ],
            "is_free": "0",
            "is_payable_later": "0",
            "isattrpresent": "1"
        }
    ]
}

How to remove extra json object in flutter

3 Answers3