invalid JSON is being produced once formatted

[ccoVeille]

Here is a content that is wrongly formatted

This is the content of a markdown file

```json
{
        "foo": "bar",
        "user_id": "2313",
        "scope": ["internal"]
}
```

This is the content of a markdown file

```json
{
  "foo": "bar",
  "user_id": "2313",
  "scope": ["internal"],
}
```

The extra comma at the end of the list lead to an invalid json

Here is my mdsf.json

{
  "$schema": "https://raw.githubusercontent.com/hougesen/mdsf/main/schemas/v0.0.2/mdsf.schema.json",
  "json": {
    "enabled": true,
    "formatter": [
      [
        "prettier"
      ]
    ]
  }
}

prettier 3.2.5 is installed and work well.

[ccoVeille]

The point I raised in #146 is interesting here as I have no way to know what formatter is being applied.

[ccoVeille]

It seems to me you are using jsonc format which supports comments and extra trailing comma

These two formats should be handled separately.

```json
{
        "foo": "bar",
        "user_id": "2313",
        "scope": ["internal"]
}
```

```jsonc
{
        "foo": "bar",
        "user_id": "2313",
        "scope": ["internal"] // some comment
}
```

[ccoVeille]

it might be related to this prettier/prettier#15956

so you will have to allow "allowTrailingCommas" for jsonc formatter and allowTrailingCommas=false for regular json

Or maybe the "bug" is already fixed, are you up 2 date on prettier ?

[hougesen]

The reason json is formatted as jsonc is because people often have comments in their json codeblocks, which isn't part of the specification.

But I just did a quick test and it seems that both prettier and deno supports formatting json files with comments. Sadly Biome does not expose the argument for allowing comments (https://github.com/biomejs/biome/blob/a6f5f0e8187912b389bf88ece65a51f1e02027a6/crates/biome_service/src/configuration/json.rs#L31).

I was already planning on introducing language “flavors” (css -> css, scss, sass, less, json -> json, jsonc, json5, sh -> sh, zsh, bash), which should fix the issue.