JSON5 is also meant to be language-agnostic. It derives its syntax from ES5 in the same way that JSON derived its syntax from ES3. I'm aware that JSON is final

JSON5 is also meant to be language-agnostic. It derives its syntax from ES5 in the same way that JSON derived its syntax from ES3. I'm aware that JSON is final — it's my hope that a new format that's easier to write (whether this or something else) picks up steam — but thanks for the feedback on the name! I consciously used a different file extension (.json5) to avoid conflicts; hopefully that's a good start. I already use (and love) CoffeeScript, but my motivation for building this was to have tools use it natively, so that sibling files in a different format wouldn't have to be maintained alongside the needed JSON.