https://community.cloudera.com/t5/Support-Questions/Nifi-How-to-add-key-value-to-json/m-p/200914#M162929 <P>Hi <A rel="user" href="https://community.cloudera.com/users/641/mburgess.html" nodeid="641">@Matt Burgess</A>.</P><P>First I want do say thank you for your work! </P><P>Second, could you please update your answer. The first part about adding an element works like charm, but when I add the part about modifying string to long the JoltTransformJSON processor thorws an error. </P><P>\" " is invalid because Specification not valid for the selected transformation \"</P><P>I'm using Nifi 1.4.0</P> Mon, 08 Jan 2018 17:50:17 GMT martin_vrabel 2018-01-08T17:50:17Z