Hi, It seems like your best and out of the box option is to use the Fork Enrichment \ Join Enrichment processor. If each record in the original data has an equivalent record in the response then that should be super easy and you can use Wrapper or Insertion Strategy to enrich your data to something similar to what you expect, however since you mentioned that successful records wont have  an equivalent record in the response ,then you can take advantage of the SQL Enrichment strategy where you can do sql join between the two input (original & response) using common ID and generate the desired out. In Sql Strategy you have a lot of flexibility but you have to be careful with the performance. The challenge here  to use the SQL strategy or any Join Enrichment strategies is to have common link between the two, for your case the only link is the record index, so you might use Json Jolt to produce such link, For example your original data will look like this: { "data": [ { "index" : "Record 1", "id": "1234569", "Date": "2022-08-22" }, { "index" : "Record 2", "id": "1234567", "Date": "2022-08-22" }, ...   and you response will  look like this after jolt transformation :   { "Index":"Record 2", "Record 2" : "Invalid values for emp info" }, { "Index":"Record 3" "Record 3" : "Invalid values for emp info" } ]   In this case you can do SQL join enrichment using "index" as the join key link For more info regarding fork \join enrichment , see the following links: https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.12.1/org.apache.nifi.processors.standard.JoinEnrichment/additionalDetails.html   Please, if you find this is helpful please accept solution. Thanks     ... View more