@Apoo  The EvaluateJsonPath processor dynamic properties do not support NiFi Expression language, so being able to pass dynamic strings to these dynamic properties from FlowFile attributes is not possible.   The dynamic properties only support NiFi parameters. You may want to raise an Apache NiFi jira requesting adding NiFi EL support to these dynamic properties or even contribute the the open source code if you so choose. Thank you, Matt ... View more