Hello @Manimaran, to help you it would be good if you go a bit more specific into your question with some sample content and what you want to have as expected output.   Greetings ... View more

Hi,   Thank you for pointing that out. It has certaintly speed up my development.   This is a short snippet to my solution:   var StreamCallback = Java.type("org.apache.nifi.processor.io.StreamCallback"); var IOUtils = Java.type("org.apache.commons.io.IOUtils"); var StandardCharsets = Java.type("java.nio.charset.StandardCharsets"); var flowFile = session.get(); if(flowFile != null) { try { // Create a new StreamCallback, passing in a function to define the interface method flowFile = session.write(flowFile, new StreamCallback(function(inputStream, outputStream) { var text = IOUtils.toString(inputStream, StandardCharsets.UTF_8); var obj = JSON.parse(text); obj["gender"] = "Male"; outputStream.write(JSON.stringify(obj).getBytes(StandardCharsets.UTF_8)); })); session.transfer(flowFile, REL_SUCCESS); } catch (e) { log.error(e.message) session.transfer(flowFile, REL_FAILURE); } }   Something to point out for those using javascript. If your using GenerateFlowFile processor to generate sample JSON content, the JSON content in Custom Text must use double quotes ( " ), not single quotes ( ' ). I spent an hour debugging why my JSON.parse(text) didn't work.   Custom Text   {'name':'myName'}   It should be   {"name":"myName"}           ... View more

@Bridewin  I two things you may want to try.... 1. GetFile processor was deprecated in favor of the newer ListFile --> FetchFile processors.  I'd recommend switching to these processors and see if you have the same observations. 2. I'd suggest enabling debug logging for the GetFile processor class to see what additional logging may show.  To do this, you would modify the logback.xml file in NiFi's conf directory. Add the below line down in this file where you see similar lines already. <logger name="org.apache.nifi.processors.standard.GetFile" level="DEBUG"/>    If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt ... View more

Try that: [ { "operation": "shift", "spec": { "*": { "Ean": "[&1].gtin", "ean": "[&1].gtin", "EAN": "[&1].gtin", "EanCode": "[&1].gtin", "EAN-Code": "[&1].gtin", "EANCode": "[&1].gtin", "Ausdr1": "[&1].gtin", "Bestand": "[&1].qty", "Menge": "[&1].qty", "Stock": "[&1].qty", "stock": "[&1].qty", "Verfügbare Menge (Kennzahl)": "[&1].qty", "Verfügbare Menge": "[&1].qty" } } }, { "operation": "modify-default-beta", "spec": { "*": { "update_date": "2022-11-03", "supplier_name": "demo", "file_name": "test" } } } ] Greetings ... View more