@vamcits    You can use EvaluateJsonPath processor to extract the 0 from the json you shared   You can name the custom property added above to whatever you like (I just used C0). This will result in a "C0" attribute being generated on the FlowFile with a value of "[0]". If you don't wan the square brackets around the number, you can remove them using an updateAttribute processor as follows: Then you can perform your routing with the RouteOnAttribute processor.   Hope this helps, Matt       ... View more