Question

我正在尝试使用jq工具从json文件中提取3个字段（状态，id，名称）的值，这是我的json：

cat parse.json

{
  "stream": {
    "_id": 65675798730520654496,
    "broadcast_platform": "live",
    "community_id": "",
    "community_ids": [],
    "average_fps": 60.0247524752,
    "delay": 0,
    "created_at": "2018-09-26T07:25:38Z",
    "is_playlist": false,
    "stream_type": "live",
    "preview": {
      "small": "https://static-cdn.jtvnw.net/previews-ttv/live_user_versuta-80x4512wdfqf.jpg",
    },
    "channel": {
      "mature": true,
      "status": "status",
      "broadcaster_language": "ru",
      "broadcaster_software": "",
      "_id": 218025408945123423423445,
      "name": "djvbsdhvsdvasdv",
      "created_at": "2011-04-17T17:31:36.091604Z",
      "updated_at": "2018-09-26T09:49:04.434245Z",
      "partner": true,
      "video_banner": null,
      "profile_banner": "https://static-cdn.jtvnw.net/jtv_user_pictures/25c2bec3-95b8-4347-aba0-128b3b913b0d-profile_banner-480.png",
      "profile_banner_background_color": "",
      "views": 103911737,
      "followers": 446198,
      "broadcaster_type": "",
      "description": "",
      "private_video": false,
      "privacy_options_enabled": false
    }
  }
}

在线json验证程序说这是有效的，当我尝试获取某些字段时，它返回null

cat parse.json | jq'.channel'

null

cat parse.json | jq'.channel.status'

null

我在做什么错人？

Answer 1

您的JSON对象具有一个顶级字段“ stream”，您需要访问“ stream”才能访问其他子属性，例如channel：

jq '.stream.channel.status' parse.json

您也可以执行cat parse.json | jq '.stream.channel.status'。

您的示例JSON也是无效的，因为stream.preview.small属性的结尾是逗号。只需删除该逗号即可使其生效。

Answer 2

要处理无效的JSON，可以使用JSON整流器，例如hjson；为避免与识别相关路径有关的麻烦，您可以使用..|objects。例如：

$ hjson -j parse.json | jq '..|objects|select(.status) | .status, ._id, .name'
"status"
218025408945123440000000
"djvbsdhvsdvasdv"

为什么用jq解析返回null？

2 个答案: