I plan on enabling filtering via xpath, and in parts jq is like xpath for json. But I'm not sure whether you mean something more with "then combine it with RSS

I plan on enabling filtering via xpath, and in parts jq is like xpath for json. But I'm not sure whether you mean something more with "then combine it with RSS or other JSON or what have you"? Merging generic input into a feed at a chosen element? Side remark: Pipes uses https://github.com/feedparser/feedparser https://github.com/feedparser/feedparser to normalize atom and rss feeds, and that gem just got support for the jsonfeed format. Untested, but worth a shot if you are looking for json input.