Interesting. There are alternatives to consider, though. If you want this feature set, YAML is a reasonable alternative. If you just want to add support for

Interesting. There are alternatives to consider, though. If you want this feature set, YAML is a reasonable alternative. If you just want to add support for comments, trailing commas, and a few other things, JSON 5 is an alternative: http://json5.org/ http://json5.org/ If you're processing lots of S-expressions (e.g., Lisp code or data), the readable Lisp notations (including sweet-expressions) might be of use: http://readable.sourceforge.net/ http://readable.sourceforge.net/