Legoktm and I have submitted an RFC regarding JSON validation in MediaWiki core. In general, the issue is that we currently have two in production, each having something the other does not, and we need to figure out what our requirements are and then consolidate around one.
Phabricator: https://phabricator.wikimedia.org/T147137 MediaWiki.org: https://www.mediawiki.org/wiki/Requests_for_comment/JSON_validation
I look forward to seeing your comments.
— James Hare http://harej.co