Fixing JSON

At this point, I'd settle for JSON5 (http://json5.org/), which says any JSON that's a valid ECMAScript 5 object is valid JSON (including trailing commas, unquoted keys, single quote strings, and comments). I don't think it's very popular at this point though, but I guess I've never tried to use it.

Ugh no. Adding all that crap complicates writing a correct parser. JSON's value is in that it is easy to parse.

If editing JSON is your problem, use a better editor. If you really want to use JSON as a config file format, use something like YAML instead.