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A possibly better option is to replace your string/integer values with JSON strings, which is LabVIEW strings with <JSON> at the start of the name. So "<JSON>Comment" rather than "Comment". JSONtext will happily parse out the value into your cluster as JSON, then when you actually need your value you can convert it to string/integer, with appropriate handling if it is null or throws an error. This method, by the way, is also how to handle JSON that has variable structure.