How to make comment in JSON file

comments-trick.json

{
    "//field": "These 'double quote' 'double quote' are used as comments, because JSON doesnt' allow comment",
    "field": {},
    "#another-field": "Another comment",
    "another-field": {},
    "/*stuff": "Be careful to use them when you have full control of the content :)",
    "stuff": [],
    "bla": "bla"
}

@twome's comment here is the best suggestion. I'd give it a 👍 if I could!

nothing works in php (json_decode) - all comments are still in data

Yeah because it's a trick, not real comment. JSON specs just don't have comments...

None of these is how I would have done it,
I would have gone for something like this instead:

{
    "Comments": [
        "Lorem ipsum dolor sit amet,",
        "consectetur adipiscing elit.",
        "Suspendisse vitae risus ligula.",
        "Fusce vel urna turpis."
    ]
}

Then you won't have to think about making identifiers for every line, and it validates.

JSON 5 (https://json5.org/) does support comments. However, support for it is limited. E.g. PHP does not support it yet.

You can use:

/*
{
"Comments": [
"Lorem ipsum dolor sit amet,",
"consectetur adipiscing elit.",
"Suspendisse vitae risus ligula.",
"Fusce vel urna turpis."
]
}
*/

other options
put all the comment in the key :-)
there should be less duplicates problems
ex

{ 
  "// this is fun":"",
  "// this is also fun": "",
  "whatever": {
    "// other scope": "",
    "// this is fun": ""
  },
  "port": 8090, "// can't use native port":""
}

I'm also looking for this.

Because JSON is a subset of YAML, # should be used as comment character. IMHO :-) but as with everything one could argue about it
The YAML port: 8090 #can't use native port
could be converted to
a) "port": 8090, "#can't use native port":""
b) "port": 8090, "#":"can't use native port"

Change the file extension to .json5 and you can haz comments 🙂

try JSON5 or JSONC

https://json5.org/

https://code.visualstudio.com/docs/languages/json#_json-with-comments

I found it

Hjson, at https://hjson.github.io/, works better for me than JSON5. YMMV.

Its Python module has been maintained more recently and its documentation shows the syntax of multiline comments as well as #-based comments.