JSON.NET to deserialize dynamic object

Question

I have JSON data:

var decodedJson =
"{{
  "user": {
    "userId": "sid:C4F4E93856104F078A11FE95892F0158"
  },
  "authenticationToken": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmdWxscm93IjoiYWxsIiwiRGJnMiI6ImxvZ2luIiwidmVyIjoiMyIsInVpZCI6InNpZDpDNEY0RTkzODU2MTA0RjA3OEExMUZFOTU4OTJGMDE1OCIsImlzcyI6InVybjptaWNyb3NvZnQ6d2luZG93cy1henVyZTp6dW1vIiwiYXVkIjoidXJuOm1pY3Jvc29mdDp3aW5kb3dzLWF6dXJlOnp1bW8iLCJleHAiOjE0NDk3NTYzNzIsIm5iZiI6MTQ0NzE2NDM3Mn0.kc-0O_aorfTw9l9U6yY6wyVtQnckqNBJikBzxAcJZ_U"
}}";

Then I want to deserialize it dynamically using JSON.NET:

var result = JsonConvert.DeserializeObject<dynamic>(decodedJson);

Then I expect to extract the UserId and Token like this:

string userId = result.user.userId;
string userToken = result.authenticationToken;

But it is saying

"Unknown member user/ authenticationToken"

Any ideas?

UPDATED:

I have copied wrong json data, it actually should be like this:

{\"user\":{\"userId\":\"sid:C4F4E93856104F078A11FE95892F0158\"},\"authenticationToken\":\"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmdWxscm93IjoiYWxsIiwiRGJnMiI6ImxvZ2luIiwidmVyIjoiMyIsInVpZCI6InNpZDpDNEY0RTkzODU2MTA0RjA3OEExMUZFOTU4OTJGMDE1OCIsImlzcyI6InVybjptaWNyb3NvZnQ6d2luZG93cy1henVyZTp6dW1vIiwiYXVkIjoidXJuOm1pY3Jvc29mdDp3aW5kb3dzLWF6dXJlOnp1bW8iLCJleHAiOjE0NDk3NjE1NDEsIm5iZiI6MTQ0NzE2OTU0MX0.oVH8R2134UQQDpXfzPv2mmrj7M05w2mzWtbp70i7GEU\"}

Since you know the JSON structure, can't your serialize to a standard type? — Arghya C
– Arghya C, Commented Nov 10, 2015 at 14:16
@ArghyaC: The jSon data may change in the future. Anyway I have followed this code sample from Microsoft Azure API azure.microsoft.com/en-gb/documentation/articles/… — Minh Nguyen
– Minh Nguyen, Commented Nov 10, 2015 at 14:19
Have you tried removing the opening { and closing }, you have 2 on start and on end and that's illegal in JSON. You can also try this stackoverflow.com/a/8972079/2096538 — Daniel Wardin
– Daniel Wardin, Commented Nov 10, 2015 at 14:24
Sorry I have copied wrong json data, just updated the question — Minh Nguyen
– Minh Nguyen, Commented Nov 10, 2015 at 15:35

James Moore · Accepted Answer · 2015-11-10 14:50:40Z

2

In the long run you would be better to copy the structure in the C# exactly. If your model changes for json then you will have to change your dynamic code anyway and the bugs are easier to creep in.

The following classes can be used to parse your json after removing the extra {}at the start and end of the response.

public class User
{
    public string userId { get; set; }
}

public class RootObject
{
    public User user { get; set; }
    public string authenticationToken { get; set; }
}

You can utilise the following site to quickly map JSON to CSharp

http://json2csharp.com/

answered Nov 10, 2015 at 14:50

James Moore

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1 Comment

Minh Nguyen Over a year ago

Thanks. I know it but I just follow the instruction from Microsoft example page and want to know what wrong with it: azure.microsoft.com/en-gb/documentation/articles/…

Daniel T. · Accepted Answer · 2015-11-10 14:25:44Z

1

It looks like you have an extra set of curly braces "{}" around the entire object in the JSON string. Have you tried removing those to see if it works?

I pasted your JSON string in a few web-based JSON formatters and they all threw errors until I removed the outermost curly braces.

answered Nov 10, 2015 at 14:25

Daniel T.

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2 Comments

Fᴀʀʜᴀɴ Aɴᴀᴍ Over a year ago

To the OP - if you receive double braces, you can remove them using : jsonString = jsonString.Substring(1, jsonString.Length - 2);

IbrarMumtaz Over a year ago

In some cases valid json when parsed with JSON.Net, the extra curly brackets are added for some reason?? That's what I am stuck on.

Arghya C · Accepted Answer · 2015-11-10 14:30:27Z

1

One way, is to use Linq-to-JSON of Json.NET like this

var jsonString = File.ReadAllText(@"C:\YourDirectory\user.json");
var jObjet = JObject.Parse(jsonString);

string userId = (string)jObjet["user"]["userId"];
string userToken = (string)jObjet["authenticationToken"];

If your object structure changes in future, you can pass the new string tag names as parameter to your method.

Note Your JSON structure is not correct, you have an extra set of braces {} around the object.

answered Nov 10, 2015 at 14:30

Arghya C

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