I am trying to find an eclipse based plugin for a jsonpath graphical builder. There are hundred different tools for XPath but I can't find a single one for jsonpath.
It's not a graphical tool, and it's not jsonpath, and it's not for Eclipse, but do you know jq?
You can do amazing things with this command line tool! And over on stackoverflow.com there are true wizards answering tricky questions about jq.
Also try gron, another command line tool more suitable for "exploratory" JSON filtering.