System.Text.Json.JsonSerializer.Deserialize is not deserializing object correctly [duplicate]

Question

I am trying to use System.Text.Json library for performance improvement. When I am trying to convert it, System.Text.Json is not able to deserialize the object but Newtonsoft.Json able to do so.

How to fix it for System.Text.Json?

fiddle https://dotnetfiddle.net/Ukzw6h

using System;
using System.Text.Json;
using Newtonsoft.Json;

public class Person {
    public string Name;
    public string Role;
}
                    
public class Program
{
    public static void Main()
    {
    
        string json = """{"Name":"John","Role":"Software Engineer"}""";
        
        using JsonDocument doc = JsonDocument.Parse(json);
        JsonElement jsonElement = doc.RootElement;
        var personText = System.Text.Json.JsonSerializer.Deserialize<Person>(jsonElement.GetRawText());
        Console.WriteLine($"from System.Text.Json {personText.Role}");
        
        var personNewton = JsonConvert.DeserializeObject<Person>(jsonElement.GetRawText());
        Console.WriteLine($"from Newtonsoft.Json {personNewton.Role}");

    }
}

output:

from System.Text.Json 
from Newtonsoft.Json Software Engineer

See also Migrate from Newtonsoft.Json - Public and non-public fields — Fildor
– Fildor, Commented Jun 12 at 13:44

AlanK · Accepted Answer · 2025-06-12 18:16:08Z

1

For System.Text.Json these are your options, give them a try:

public class Person {
  [JsonInclude] public string Name;
  public string Role { get; set; }
}

and credit to @fildor in the comments for adding

// Same thing works for Deserialize
JsonSerializer.Serialize(person, new JsonSerializerOptions() { IncludeFields = true });

edited Jun 12 at 18:16

answered Jun 12 at 14:50

AlanK

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2 Comments

Fildor Jun 12 at 15:45

That's missing the most obvious JsonSerializerOptions.IncludeFields Property

AlanK Jun 12 at 18:07

Particularly if you're not the author of Person. Thanks.

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