Error during JSON parsing

Question

JSON string:

[{"id":"1","username":"admin","password":"anymd5hash","rank":"2"}]

following code:

Newtonsoft.Json.Linq.JObject userData;
userData = Newtonsoft.Json.Linq.JObject.Parse(result);
MessageBox.Show(userData["username"].ToString());

When I execute this code, there will be an error:

Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path '', line 1, position 1.

I'm pretty sure, that this code has worked in another project.

What is my mistake?

Remove the [ and ] from your string and try again. It's an array. — Ian Mercer
– Ian Mercer, Commented Apr 3, 2016 at 17:26
Or more likely, switch to Newtonsoft.Json.Linq.JArray.Parse. That will accept your existing input. JToken would also work for either arrays (what you've got) or objects. — Matthew Haugen
– Matthew Haugen, Commented Apr 3, 2016 at 17:28
If you don't know in advance if the root object is an array or object, use JToken.Parse(). — dbc
– dbc, Commented Apr 3, 2016 at 17:52

Alberto Chiesa · Accepted Answer · 2016-04-03 17:30:16Z

5

You are not providing a Json object, you are providing a Json Array with a single object inside it:

// Json object:
{
  "id": "1",
  ...
}

//Json array:
[
  {
    "id": "1",
    ...
  }
]

So, either you change the json or the Json.Net code (and look for JArray as in the comments).

BTW, if you know the properties in advance you really should create a .Net class to be used to contain the deserialization.

public class UserData
{
  public string id { get; set; }
  public string username { get; set; }
  public string password { get; set; }
  public string rank { get; set; }
}

// and then, in your code:
List<UserData> userData = Newtonsoft.Json.JsonConvert.DeserializeObject<List<UserData>>(result);

answered Apr 3, 2016 at 17:30

Alberto Chiesa

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