null values in JSON values

Question

null values in JSON values

net 6 newbie 121

When return type in Controller is JObject the values in the json object are displayed null.
But If I am trying to print on Console the out put is Ok.

How to deal with this?

Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2022-07-30T21:23:38.827+00:00
Lose the image, two small and is of no help

Use a code block to show the json

If using a class to deserialize show it in a code block

net 6 newbie 121

Response looks like this
{
"access_token": [],
"expires_in": [],
"scope": [],
"token_type": [],
"id_token": []
}
I have been using the repository model in Web Api project
And the code the repository looks like this.

var client = new RestClient("https://oauth2.googleapis.com");  
        var request = new RestRequest("/token", Method.Post);  
        request.AddHeader("Content-Type", "application/json");  
        request.AddHeader("Accept", "application/json");  
         var body = JsonConvert.SerializeObject(data);  
        request.AddBody(body, "application/json");  
        var response = await client.PostAsync(request);  
        var response_json = JObject.Parse(response.Content);  
         return response_json;

From the Controller the code looks like

public async Task<JObject> Test([FromBody] Oauth oauth)  
        {  
            var response = await _client.Testmethod(oauth);  
            return response;  
          
        }

Viorel 122.5K Reputation points

2022-07-31T09:01:23.937+00:00

In which part of your code did you print to console to check the data?
net 6 newbie 121 Reputation points

2022-07-31T10:10:49.67+00:00
In the repository part just above the return statement

Console.WriteLine(response_json); return response_json
Jack J Jun 25,296 Reputation points

2022-08-01T07:28:59.07+00:00

@et6newbie-4004, Welcome to Microsoft Q&A, I noted that your code var body = JsonConvert.SerializeObject(data); has the data field, but I didn't see that the value of data. Could you provide it?

2 answers

Your answer

Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2022-07-30T21:23:38.827+00:00

Lose the image, two small and is of no help

Use a code block to show the json

If using a class to deserialize show it in a code block
net 6 newbie 121 Reputation points

2022-07-31T03:32:50.01+00:00

Response looks like this
{
"access_token": [],
"expires_in": [],
"scope": [],
"token_type": [],
"id_token": []
}
I have been using the repository model in Web Api project
And the code the repository looks like this.

var client = new RestClient("https://oauth2.googleapis.com"); var request = new RestRequest("/token", Method.Post); request.AddHeader("Content-Type", "application/json"); request.AddHeader("Accept", "application/json"); var body = JsonConvert.SerializeObject(data); request.AddBody(body, "application/json"); var response = await client.PostAsync(request); var response_json = JObject.Parse(response.Content); return response_json;

From the Controller the code looks like

public async Task<JObject> Test([FromBody] Oauth oauth) { var response = await _client.Testmethod(oauth); return response; }
Viorel 122.5K Reputation points

2022-07-31T09:01:23.937+00:00

In which part of your code did you print to console to check the data?
net 6 newbie 121 Reputation points

2022-07-31T10:10:49.67+00:00

In the repository part just above the return statement

Console.WriteLine(response_json); return response_json
Jack J Jun 25,296 Reputation points

2022-08-01T07:28:59.07+00:00

@et6newbie-4004, Welcome to Microsoft Q&A, I noted that your code var body = JsonConvert.SerializeObject(data); has the data field, but I didn't see that the value of data. Could you provide it?

Answer 1

Bruce (SqlWork.com) 77,686 Volunteer Moderator

Most likely the server is returning an error. You don’t check the response code.

net 6 newbie 121 Reputation points

2022-07-31T18:07:41.317+00:00

Is there any way around to get the correct JSON response.

Answer 2

I had a similar problem. It worked in the Console but not on the web page. Copilot couldn't solve it initially, but subsequently it gave me this answer.

Serialization Issue: When you pass a JObject to Results.Ok(), ASP.NET Core uses its default JSON serializer (System.Text.Json) to serialize the object. However, JObject and JArray are part of Newtonsoft.Json, and the default serializer may not handle them properly.

My initial code was this:

    JObject JSONMainObj = new JObject(
        new JProperty("lastUpdated", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")),
        new JProperty("version", "1.0.0")
      );
    foreach (var property in JSONMainObj.Properties())
    {
        if (property.Value.Type == JTokenType.String)
        {
            Console.WriteLine($"{property.Name}: {property.Value}");
        }
    }
  return Results.Ok(JSONMainObj);

In the Console it returned this:

lastUpdated: 2025-06-03 21:58:36
version: 1.0.0

but on a web page it returned:

{"lastUpdated":[],"version":[]}

Copilot's suggestion was to:

Force the use of Newtonsoft.Json for serialization by converting the JObject to a string before returning it.

It suggested changing the last line to:

 return Results.Content(JSONMainObj.ToString(), "application/json");

The Console output was the same but the web page output was now correct:

{
  "lastUpdated": "2025-06-03 22:07:54",
  "version": "1.0.0"
}

(All thanks to Copilot, and I know the question is 3 years old)

Share via

null values in JSON values

2 answers

Your answer