convert json to csv on nifi

[Anushka Hewawitharana]

Dear Team, 

I have listen json kafka feed and put to flat files using nifi
Now i need to convert them to csv using nifi.



But i have error on "json path"  attribute on splitjson processor.
My sample json as below.

   {  
      "section":"prepaid_myplan",
      "action":"change_mypaln",
      "sender":null,
      "recipient":null,
      
"details":"{\"channel\":\"SCAPP\",\"planId\":\"1\",\"serviceAmounts\":[{\"serviceId\":\"5\",\"usageAmount\":\"0\"},{\"serviceId\":\"4\",\"usageAmount\":\"0\"},{\"serviceId\":\"1\",\"usageAmount\":\"0\"},{\"serviceId\":\"2\",\"usageAmount\":\"50\"}],\"totalValue\":\"137700\"}",
      "amount":null,
      "account_no":null,
      "datetime":"2011-08-20 11:18:38",
      "msisdn":"555555555",
      "imei":"null",
      "nic":"155555504555",
      "lob":"MOBILE",
      "deviceOs":"android",
      "appVersion":"9.0.0",
      "deviceModelId":"MSM55574",
      "connType":"PREPAID",
      "language":"en",
      "device_id":null,
      "status":"SUCCESS"
   }

kindly advise me on json path for above



Regards
Anushke