.NET Core: Remove null fields from API JSON response

This can also be done per controller in case you don't want to modify the global behavior:

public IActionResult GetSomething()
{
   var myObject = GetMyObject();
   return new JsonResult(myObject, new JsonSerializerSettings() 
   { 
       NullValueHandling = NullValueHandling.Ignore 
   });
};

I found that for dotnet core 3 this solves it -

services.AddControllers().AddJsonOptions(options => {
     options.JsonSerializerOptions.IgnoreNullValues = true;
});

.NET Core 1.0

In Startup.cs, you can attach JsonOptions to the service collection and set various configurations, including removing null values, there:

public void ConfigureServices(IServiceCollection services)
{
     services.AddMvc()
             .AddJsonOptions(options => {       
                  options.SerializerSettings
                         .NullValueHandling = NullValueHandling.Ignore;
     });
}

.NET Core 3.1

Instead of this line:

options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;

Use:

options.JsonSerializerOptions.IgnoreNullValues = true;

.NET 5.0

Instead of both variants above, use:

 options.JsonSerializerOptions.DefaultIgnoreCondition 
                       = JsonIgnoreCondition.WhenWritingNull;

The variant from .NET Core 3.1 still works, but it is marked as NonBrowsable (so you never get the IntelliSense hint about this parameter), so it is very likely that it is going to be obsoleted at some point.