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All is in title
you announced it on blog, I think but easily reassign back if you don't plan to work on it
I looked through this possibility, but it will not be as easy as was for the YAML editor. The difference is that for JSON files is used javascript editor and the biggest problem is that the Json FileObject has different mimetype (text/x-json) than has the JSON language (text/x-javascript). At first there has to be separated the Json language from javascript editor to solve this clash.
RFE