Error on flutter : type 'List<dynamic>' is not a subtype of type 'String'

Question

I have this Json. I want to map my json data. But i get some error.

{
"Id": 0,
"Product_Id": 0,
"Quantity": 0,
"User_Id": "a49a10d2-fc3f-477a-b087-5b0d07545964",
"Active": false,
"CartProducts": null,
"Products": [
    {
        "Id": 116,
        "Shop_Id": 1,
        "Offer": 0.0,
        "Quantity": 1,
        "Price": 100.0,
        "Category_Id": 0,
        "Description": null,
        "Name": "Lacoste Product",
        "Active": false,
        "Size": "small",
        "Color": "black",
        "Is_External_Product": true,
        "External_Link": "https://www.lacoste.com.tr/urun/kadin-kirmizi-polo-pf0504-007-4/",
        "Currency": null,
        "ProductImages": null
    }
]
}

I am decoding Json here

if(jsonObject['Products']!=null){
  productItems = ProductItem.getListFromJson(jsonObject['Products']);
}

static List<ProductItem> getListFromJson(List<dynamic> jsonArray) {
log("getListFromJson");
List<ProductItem> list = [];
for (int i = 0; i < jsonArray.length; i++) {
  list.add(ProductItem.fromJson(jsonArray[i]));
}
return list;
 }

But i get this error. "[log] type 'List' is not a subtype of type 'String'"

Do you get a line where the error occurs? Because jsonArray[i] is of type dynamic and you are passing it into your fromJson function. What are you supposed to pass into the fromJson? A List or does it expect a String? — lyio
– lyio, Commented Jun 4, 2021 at 6:53
i am passing a list (Products). I have a list in a json object. — Cihan Kalmaz
– Cihan Kalmaz, Commented Jun 4, 2021 at 7:13

Athanas · Accepted Answer · 2021-06-04 06:51:15Z

1

You are trying to assign a value of type String to the product items array. There might be a possibility one of your responses is returning a String and you are expecting an array. Please inspect the response.

answered Jun 4, 2021 at 6:51

Athanas

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Comments

iAhmedGhalab · Accepted Answer · 2021-06-04 07:52:53Z

0

It's a JSON parsing issue, and it might not directly related to "Products" as being a list or string.

So instead, for better diagnosing this error, or other error on the future, you could need to enable the dart debugger, while checking the "uncaught exception" option, which will guide you to the broken type casting issue.

answered Jun 4, 2021 at 7:52

iAhmedGhalab

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2 Comments

Cihan Kalmaz Over a year ago

How can i open this setting window?

iAhmedGhalab Over a year ago

@CihanKalmaz If you are using the Visual Studio Code, you can use the ( ⌘ + ⇧ + D) or open the run & Debug from the left side menu.

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