ASP.NET Core - Json serializer settings Enum as string and ignore null values

Startup.cs

public class Startup
{
  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
    services.AddMvc().AddJsonOptions(options =>
    {
      options.SerializerSettings.Converters.Add(new Newtonsoft.Json.Converters.StringEnumConverter());
      options.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
    });
  }
}

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Seems to not be working for enums in response.

Limitation here: There doesn't seem to be a way to simply allow strings as enums but still prefer integers. I want to still allow input JSON bodies to accept strings for enums but dont want to serialize results with strings

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Didn't work for me. I ended up adding a schema filter and then...

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Maybe this would help somebody. The same code for .net core 3.0 will look like this:

services.AddMvc()
    .AddJsonOptions(options => {
        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        options.JsonSerializerOptions.IgnoreNullValues = true;
    });

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Nice!

using System.Text.Json.Serialization;
...

services
    .AddControllers()
    .AddNewtonsoftJson()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        options.JsonSerializerOptions.IgnoreNullValues = true;
    });

Working in .NET core 5.0

Make sure to include AddNewtonsoftJson() if you're using JSON PATCH. Otherwise it wont work.

Nice!

using System.Text.Json.Serialization;
...

services
    .AddControllers()
    .AddNewtonsoftJson()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        options.JsonSerializerOptions.IgnoreNullValues = true;
    });

Working in .NET core 5.0

Make sure to include AddNewtonsoftJson() if you're using JSON PATCH. Otherwise it wont work.

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For dotnet 6 a few options were deprecated

        .AddJsonOptions(options =>
        {
            options.JsonSerializerOptions.WriteIndented = true;

            // serialize enums as strings in api responses (e.g. Role)
            options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());

            // ignore omitted parameters on models to enable optional params (e.g. User update)
            options.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
        });```