Anonymise certain fields in a blob of JSON using Json.Net + JToken

UserInputAnonymiser.cs

using System.Linq;
using Newtonsoft.Json.Linq;

namespace ExternalApi.Logging
{
	public static class UserInputAnonymiser
	{
		public static JToken Anonymise(JToken data)
		{
			foreach (var prop in data.Children<JProperty>())
			{
				if (ShouldBeAnonymised(prop.Name))
					prop.Value = "-{anonymised}-";
				else if (prop.Value.HasValues)
					prop.Value = Anonymise(prop.Value);
			}

			return data;
		}

		private readonly static string[] AnonymousProps = { "firstname", "lastname", "emailaddress", "phonenumber" };

		private static bool ShouldBeAnonymised(string propertyName)
		{
			return AnonymousProps.Any(x => propertyName.ToLowerInvariant().Contains(x));
		}
	}
}