因此我将调试信息放入 http 网站页眉, 以避免打破客户端:

header("My-Json-Comment: Yes, I know it's a workaround ;-) ");

调

您可以通过正则表达式使用简单的预处理。例如,以下函数将在php中解码注释json:

function json_decode_commented ($data, $objectsAsArrays = false, $maxDepth = 512, $opts = 0) {
  $data = preg_replace('~
    (" (?:[^"\\\\] | \\\\\\\\ | \\\\")*+ ") | \# [^\v]*+ | // [^\v]*+ | /\* .*? \*/
  ~xs', '$1', $data);

  return json_decode($data, $objectsAsArrays, $maxDepth, $opts);
}

它支持所有php- type 注释 : / *, , , / / 。 字符串的字典被保存 。

是, 新的标准json5 允许 c++ 样式注释, 以及许多其他扩展名 :

// A single line comment.

/* A multi-
   line comment. */

json5 数据交换格式 (json5) 是一套超常的json 组合, 旨在减轻json 的某些限制 。 它完全向后兼容, 使用它可能比撰写自定义的非标准采集器、 对现有的打开非标准功能或者使用像字符串字段这样的各种黑客来评论更好 。 或者, 如果使用中的解析器支持的话, 简单地同意我们使用 json 5 子集, 即json 和 c++ 风格评论 。 这比我们We tweak json 标准我们觉得合适的方法要好得多 。

已经存在 npm 软件包、 python 软件包、 java 软件包和 c 库。 它是向后兼容的 。 我看不出有什么理由继续使用“ 官方” json 限制 。

i 认为从json删除评论的原因与删除在java超载的操作员的理由相同: 可能会被错误地使用, 但却忽略了某些明显合理的使用案例。 对于操作员超载, 它就是矩阵代数和复杂数字。 对于 json 的评语, 它是配置文件和其他文件, 可由人类而不是仅由分析员撰写、 编辑或阅读 。

json不允许评论本身。推理是完全愚蠢的, 因为你可以使用json自己来创造评论, 这完全排除了推理, 并且毫无理由地在完全相同的结果和潜在问题上加载采集数据空间, 比如: 带有评论的json文件。

如果您试图在(使用 / 或 / * * * 或 ) 中发表评论, 那么某些剖析器将会失败, 因为严格来说这不在json 的规格之内 。 所以您不应该这样做 。

例如,在这里,我的图像操作系统保存了图像标记和一些基本格式化(注释)信息(底部):

{
    "Notations": [
        {
            "anchorX": 333,
            "anchorY": 265,
            "areaMode": "Ellipse",
            "extentX": 356,
            "extentY": 294,
            "opacity": 0.5,
            "text": "Elliptical area on top",
            "textX": 333,
            "textY": 265,
            "title": "Notation 1"
        },
        {
            "anchorX": 87,
            "anchorY": 385,
            "areaMode": "Rectangle",
            "extentX": 109,
            "extentY": 412,
            "opacity": 0.5,
            "text": "Rect area\non bottom",
            "textX": 98,
            "textY": 385,
            "title": "Notation 2"
        },
        {
            "anchorX": 69,
            "anchorY": 104,
            "areaMode": "Polygon",
            "extentX": 102,
            "extentY": 136,
            "opacity": 0.5,
            "pointList": [
                {
                    "i": 0,
                    "x": 83,
                    "y": 104
                },
                {
                    "i": 1,
                    "x": 69,
                    "y": 136
                },
                {
                    "i": 2,
                    "x": 102,
                    "y": 132
                },
                {
                    "i": 3,
                    "x": 83,
                    "y": 104
                }
            ],
            "text": "Simple polygon",
            "textX": 85,
            "textY": 104,
            "title": "Notation 3"
        }
    ],
    "imageXW": 512,
    "imageYW": 512,
    "imageName": "lena_std.ato",
    "tinyDocs": {
        "c01": "JSON image notation data:",
        "c02": "-------------------------",
        "c03": "",
        "c04": "This data contains image notations and related area",
        "c05": "selection information that provides a means for an",
        "c06": "image gallery to display notations with elliptical,",
        "c07": "rectangular, polygonal or freehand area indications",
        "c08": "over an image displayed to a gallery visitor.",
        "c09": "",
        "c10": "X and Y positions are all in image space. The image",
        "c11": "resolution is given as imageXW and imageYW, which",
        "c12": "you use to scale the notation areas to their proper",
        "c13": "locations and sizes for your display of the image,",
        "c14": "regardless of scale.",
        "c15": "",
        "c16": "For Ellipses, anchor is the  center of the ellipse,",
        "c17": "and the extents are the X and Y radii respectively.",
        "c18": "",
        "c19": "For Rectangles, the anchor is the top left and the",
        "c20": "extents are the bottom right.",
        "c21": "",
        "c22": "For Freehand and Polygon area modes, the pointList",
        "c23": "contains a series of numbered XY points. If the area",
        "c24": "is closed, the last point will be the same as the",
        "c25": "first, so all you have to be concerned with is drawing",
        "c26": "lines between the points in the list. Anchor and extent",
        "c27": "are set to the top left and bottom right of the indicated",
        "c28": "region, and can be used as a simplistic rectangular",
        "c29": "detect for the mouse hover position over these types",
        "c30": "of areas.",
        "c31": "",
        "c32": "The textx and texty positions provide basic positioning",
        "c33": "information to help you locate the text information",
        "c34": "in a reasonable location associated with the area",
        "c35": "indication.",
        "c36": "",
        "c37": "Opacity is a value between 0 and 1, where .5 represents",
        "c38": "a 50% opaque backdrop and 1.0 represents a fully opaque",
        "c39": "backdrop. Recommendation is that regions be drawn",
        "c40": "only if the user hovers the pointer over the image,",
        "c41": "and that the text associated with the regions be drawn",
        "c42": "only if the user hovers the pointer over the indicated",
        "c43": "region."
    }
}

在撰写本报告时,Appings.json支持评论。

例如(微软的样本)

{
  "Logging": {
    "LogLevel": { // All providers, LogLevel applies to all the enabled providers.
      "Default": "Error", // Default logging, Error and higher.
      "Microsoft": "Warning" // All Microsoft* categories, Warning and higher.
    },
    "Debug": { // Debug provider.
      "LogLevel": {
        "Default": "Information", // Overrides preceding LogLevel:Default setting.
        "Microsoft.Hosting": "Trace" // Debug:Microsoft.Hosting category.
      }
    },
    "EventSource": { // EventSource provider
      "LogLevel": {
        "Default": "Warning" // All categories of EventSource provider.
      }
    }
  }
}

json不支持本地的评论, 但您可以自己做解码器或至少预处理器来删除评论, 这完全没问题(只要您只是忽略评论, 不使用它们来指导您的应用程序如何处理json数据 ) 。

json 没有评论。 json 编码器不能输出评论。 json 编码器可以接受和忽略评论。

评论不应被用来传递任何有意义的信息。 这就是json的目的。

参考:杜格拉斯·克罗福德,Json Spec的作者。