Web SDK configuration - return empty string

Question

Assume that my Data Element is not found on a page - Web SDK would return error. There this functionality would prevent such a situation? Do you turn this on on your implementations?

arpan-garg · Accepted Answer

Hi ​@Michael_Soprano - Yes this should work the same way as described, if the data element is used within a rule and is not defined in library you will get undefined, using this checkbox will make sure empty is returned.

AmitVishwakarma · Answer

Hi ​@Michael_Soprano,Yes – that property setting “Return an empty string for missing data elements” will prevent the “data element not found” case from surfacing as undefined and breaking your Web SDK rule logic. When a data element can’t resolve, Tags will return "" instead of undefined/null.But:Web SDK will still get those attributes (now as empty strings), it does not auto‑remove them from the XDM.If you want to actually drop empty fields, you can use an onBeforeEventSend callback in the Web SDK extension (Configure -> Data collection -> Provide on before event send callback code) and strip keys where the value is ""/null before send. See:https://experienceleague.adobe.com/en/docs/experience-platform/collection/js/commands/configure/onbeforeeventsendIn most implementations I’ve seen, teams don’t turn this checkbox on globally, they prefer:Per–data-element default values, and/orA small onBeforeEventSend cleanup to remove empty attributes.Thanks,Amit

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