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Any inbuilt services is there for validation?
Could you please elaborate on your use case and what you are trying to do?
There are a validator and an exression built-in functions, you may read about it in the helpcenter https://support.ptc.com/help/thingworx/platform/r9/en/#page/ThingWorx%2FHelp%2FMashup_Builder%2FFunctions%2FFunctions.html%23