JsonSchemaExtensionDataAttribute public class JsonSchemaExtensionDataAttribute : Attribute, IJsonSchemaExtensionDataAttribute Adds an extension data property to a class or property. Documentation Code public IReadOnlyDictionary<string, object> ExtensionData { get; } public string Key { get; } Gets the property name. public object Value { get; } Gets the value. public JsonSchemaExtensionDataAttribute(string key, object value) Initializes a new instance of the JsonSchemaExtensionDataAttribute class.