using System;

using System.Text.Json;

using System.Text.Json.Serialization;

​

namespace TestNamespace 

{

    public class Program

    {   

        public static void Main()

        {

            var options = new JsonSerializerOptions

            {

                Converters =

                {

                    new JsonStringEnumConverter(),

                },

            };

            // Prints `"Value"`. Correct behavior

            Console.WriteLine(JsonSerializer.Serialize(TestEnum.Value, options));

            // Prints `{"EnumValue":{}}`. Desired output: `{"EnumValue":"Value"}`

            Console.WriteLine(JsonSerializer.Serialize(new TestModel { EnumValue = TestEnum.Value }, options));

        }

    }

    public class TestModel {

        public Enum EnumValue {get; set;}

    }

​

    public enum TestEnum 

    {

        Value

    }

}