I like json a lot.

That said, I think json would benefit from only two things:

1) comments

2) allow extra commas, like ["a", "b", "c",] or {"a":"b", "c":"d", }

or more properly:

  {
    "a":"b",
    "c":"d",
  },

EDIT: and json5 does both, plus a few more niceties. (hmm. too much?)