Change json field name on api controller answer

Question

Let's say I have a controller with a get method:

[HttpGet]
public Car Get()
{
    return new Car() { Color = "Yellow" };
}

And also defined the Car class

public class Car {
   [JsonProperty(PropertyName = "TheColorIs")]
   public string Color {get;set;}
}

The client is receiving something like this in json format: { "Color": "Yellow" } Why isn't the property name in the json response "TheColorIs" ? Thanks

Answer 1

I guess you are using ASP.NET Core 3.x which using System.Text.Json instead of Newtonsoft.Json . So that you should use JsonPropertyNameAttribute Class from System.Text.Json.Serialization namespace :

public class Car
{
    [JsonPropertyName("TheColorIs")]
    public string Color { get; set; }
}