Need to hide properties in your JSON result for a .net core API. Add the following line in your Startup.cs file. Just like below.
opts.SerializerSettings.NullValueHandling = NullValueHandling.Ignore
services.AddMvc(options =>
{
options.InputFormatters.RemoveType<Microsoft.AspNetCore.Mvc.Formatters.SystemTextJsonInputFormatter>();
options.OutputFormatters.RemoveType<Microsoft.AspNetCore.Mvc.Formatters.SystemTextJsonOutputFormatter>();
})
.AddNewtonsoftJson(opts =>
{
opts.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
opts.SerializerSettings.Converters.Add(new StringEnumConverter(new CamelCaseNamingStrategy()));
opts.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
})
.AddXmlSerializerFormatters();