Apache NiFi RecordPath Guide
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trim

Removes whitespace from the start and end of a string.

{
  "type": "record",
  "name": "events",
  "fields": [
    { "name": "name", "type": "string" }
  ]
}

and a record such as:

{
  "name" : "    John Smith    "
}

The following record path expression would remove extraneous whitespace:

RecordPath

Return value

trim(/name)

John Smith