Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.g. {“name”:“value”})

Question

I have JSON returning in the following format:

{
"Items": [
    {
        "unique_id": "11111111111",
        "rages": {
            "rage_content": "Hello rage 2",
            "date_stamp": "21/07/2017",
            "id": 2
        }
    },
    {
        "unique_id": "2222222222",
        "rages": {
            "rage_content": "Hello rage 1",
            "date_stamp": "21/07/2017",
            "id": 1
        }
    }
],
"Count": 2,
"ScannedCount": 2
}

And I have the following 2 classes defined:

Items.cs:

namespace ragevent_A0._0._1
{
    class Items
    {
        public String rage_id { get; set; }
        public rage rage { get; set; }

    }
}

rage.cs:

class rage
{
    public String rage_content { get; set; }
    public String date_stamp { get; set; }
    public int id { get; set; }
}

I am using the following code in order to attempt to deseralize the JSON returned above:

List<Items> data = JsonConvert.DeserializeObject<List<Items>>(json);

However, I am not able to successfully deserialize the data due to the above error. I have tried a few solutions online, however I have not managed to find a solution which works with the format of my returned JSON. I have used a JSON formatter and it is formatted correctly, so that shouldn't be the issue.

Any help would be much appreciated!

your c# class has rage_id while your JSON object has "unique_id". Is that no problem? Also you are not deserializing an array of objects but and object containing that array — danielspaniol
– danielspaniol, Commented Jul 21, 2017 at 14:24
Another nice VS extension is marketplace.visualstudio.com/items?itemName=DangKhuong.JSONtoC — Sir Rufo
– Sir Rufo, Commented Jul 21, 2017 at 14:30

Rahul · Accepted Answer · 2017-07-21 14:36:39Z

2

For the posted JSON data below should be the model you need (credit: http://json2csharp.com/). There is mismatch between the property name rage_id. You can use JsonProperty attribute

public class Rages
{
    public string rage_content { get; set; }
    public string date_stamp { get; set; }
    public int id { get; set; }
}

public class Item
{
    [JsonProperty(Name="rage_id")]
    public string unique_id { get; set; }
    public Rages rages { get; set; }
}

public class RootObject
{
    public List<Item> Items { get; set; }
    public int Count { get; set; }
    public int ScannedCount { get; set; }
}

Your deserialization should be

var data = JsonConvert.DeserializeObject<RootObject>(json);

edited Jul 21, 2017 at 14:36

answered Jul 21, 2017 at 14:25

Rahul

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13 Comments

Callum Holden Over a year ago

Ah ok awesome, cheers. I have added this into my application however I am still getting an error when trying to deseralize. Sorry about the unique_id - it was a typo. I am using this to deseralize: List<RootObject> data = JsonConvert.DeserializeObject<List<RootObject>>(json);

Sir Rufo Over a year ago

@CallumHolden The json document describes a single object and not an array. An array would start with [ and an object start with { - do you see?

Rahul Over a year ago

@CallumHolden, you don't have an array of root object. see edit in answer.

Sir Rufo Over a year ago

@CallumHolden I have the strange feeling you did not get the whole point. Anyway, you should have a working solution for this ;o)

Rahul Over a year ago

@SirRufo, was about to write the same ... so +1 :)

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