I'm looking to create a bit of JSON using Nifi Expression Language so that I can send it to a web service. But It does not look like Nifi Expression Language have a function for escaping text to put into JSON. I've looked around in the wiki and I don't see any documentation now how to extend the Expression Language (not even sure if it is possible).
Looks like nifi makes use of Apache commons-lang which has some functions that would do the heavy lifting. [1] So if someone can help me understand the Expression Language end points I could do the work fairly easily I think. And add functions for the other formats supported by StringEscapeUtils (XML, csv, html). I think this could be useful. Devin [1] https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/StringEscapeUtils.html
