Apologies I gave wrong version.nifi 1.9.2   Also I tried correcting syntax   Invalid Expression: ${FF_CONTENT:jsonPathAdd('$.linkedData',${callid})} due to Unexpected token 'jsonPathAdd'     ... View more

Thank so much for the reply.   I tried the flow, but i am see an exception "Unexpected token 'jsonPathAdd'". I am using nifi 2.11. org.apache.nifi.processor.exception.ProcessException: Unable to evaluate new value for attribute 'FF_CONTENT': org.apache.nifi.attribute.expression.language.exception.AttributeExpressionLanguageException: Invalid Expression: ${FF_CONTENT:jsonPathAdd('$linkedData',${callid})} due to Unexpected token 'jsonPathAdd' at line 1, column 13. ... View more

This is my JSON in flow file content { "linkedData" : [ ], "comid" : "C3XXXXXXXXXXA-aidan-16802451" } I have an attribute  callid : C3XXXXXXXXXX-XXXX-16802451   I want attribute callid value into linkedData array in JSON of flow file ... View more