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Serialize Enum as String

Return enums as their string value

builder.Services.AddControllers()
   .AddJsonOptions(options =>
   {
       options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
   });

Or you could just annotate the property like so

public class ApplicationUser
{
   ...
   [JsonConverter(typeof(JsonStringEnumConverter))]
   public Gender Gender { get; set; }
   ...
}

Enums are still saved as their integer representation in the database.