static public function isJsonString($value, $message = null, $propertyPath = null)
        {
            if (null === json_decode($value) && JSON_ERROR_NONE !== json_last_error()) {
                $message = $message ?: sprintf(
                    'Value "%s" is not a valid JSON string.',
                    static::stringify($value)
                );

                throw static::createException($value, $message, static::INVALID_JSON_STRING, $propertyPath);
            }
        }