public static class JsonProcessStringHelper
    {
        public static void ProcessStrings(this JObject jObject, Func<string, string> processFunc)
        {
            foreach (var property in jObject.Properties())
            {
                var token = property.Value;
                token.ProcessStrings(processFunc);
            }
        }

        public static void ProcessStrings(this JToken token, Func<string, string> processFunc)
        {
            if (token.Type == JTokenType.Array)
            {
                var arrayToken = (JArray)token;
                foreach (var item in arrayToken)
                {
                    item.ProcessStrings(processFunc);
                }
            }
            if (token.Type == JTokenType.Object)
            {
                var tokenObject = token as JObject;
                tokenObject.ProcessStrings(processFunc);
            }
            if (token.Type == JTokenType.String)
            {
                var jValue = token as JValue;
                if (jValue != null)
                {
                    var value = jValue;
                    value.Value = processFunc(value.Value.ToString());
                }
            }
        }

        public static string SubstringChecked(this string value, int startIndex, int length)
        {
            if ((length - startIndex) >=value.Length)
            return value;
            return value.Substring(startIndex, length);
        }
    }