JSON with comments POC. Example here: http://jsbin.com/favarow/

jsonWithComments.js

// jshint esnext:true

/*
  Every JSON entry is removed if the key is "_comment". "_comment" can optionally be followed
  by underscores, letters, or digits to make the key more unique (e.g. "_comments_name", "_comments_todo").
  The JSON is still valid JSON with the "_comment", and it will parse fine anywhere. It will
  just have the extra "_comment" entries.
  
  See example here: http://jsbin.com/favarow/
*/

const o = {
  "configurationVersion": 2.1, "_comment": "this value is rarely changed",
  "clientID": "X918273645",
  "customerReferenceID": "000392739",
  "network": {
    "ipAddresses": ["17.128.255.0", "127.0.0.1", "10.10.10.1"],
    "_comment_abc_123": "Only the 17.x.x.x address is publicly addressable",
    "ports": [80, 443, 21, 22, 1337]
  },
  "processingLevel": "FULL",
  "customer": {
    "name": "john doe",
    "postalCode": "A1B2C3",
    "country": "CAN",
    "_comment": "Canada is the best"
  },
  "misc": {
    "_comment": "\
      Are backslash line-breaks actually valid JSON? \
      bar \
      baz \
      foo \
      "
  }
};


const noComments = commentFreeJson(o);
console.log(`No comments found in output: ${testCommentsFound(noComments)}`);
console.log(noComments);

function commentFreeJson(obj) {
  const commentRe = /(,?\s?"_comment[\w\d_]*"\s?:\s?"[^"]{0,}?"\s?)/gi;
  return JSON.stringify(obj).replace(commentRe, '');
}

function testCommentsFound(s) {
  return /_comment/.test(s) === false;
}