<PackageReference Include="Newtonsoft.Json" Version="14.0.1-beta1" />

Newtonsoft.Json.Schema.UndefinedSchemaIdHandling

Specifies undefined schema Id handling options for the JsonSchemaGenerator.

JSON Schema validation has been moved to its own package. See https://www.newtonsoft.com/jsonschema for more details.
namespace Newtonsoft.Json.Schema { public enum UndefinedSchemaIdHandling { None, UseTypeName, UseAssemblyQualifiedName } }