Apache NiFi RecordPath Guide
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isBlank

Returns true if the provided value is either null or is an empty string or a string that consists only of white space (spaces, tabs, carriage returns, and new-line characters).

RecordPath

Return value

/name[isBlank(/details/employer)]

John Doe

/name[isBlank(/details/vehicle)]

John Doe

/name[isBlank(/details/phase)]

John Doe

/name[isBlank(.)]

<returns no results>