javascript - 如何使用 Node.js 解析包含 JSON 对象数组的文件？

Question

我有一个项目，我想从包含具有重复属性的 json 对象数组的文件中获取 JSON 数据:

some-file:(每个对象都在 1 行中，为了简单起见，我对其进行了格式化)

{
   "A":"ALL",
   "B":"3349256522",
   "Location":{

      "Country":"USA"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.4",
   },
   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-04T14:15:52.063Z"
}

{
   "A":"NONE",
   "B":"8469256522",
   "Location":{
      "Country":"SPAIN"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.5",
   },

   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-09T14:15:52.063Z"
}

{
   "A":"ALL",
   "B":"8469256522",
   "Location":{

      "Country":"USA"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.4",
   },

   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-11T14:15:52.063Z"
}

我想获取特定项目、国家/地区和应用程序版本的一些统计信息。 我如何使用 NodeJs 处理它以产生此输出:

{
   "stats":{
      "Country":{
         "USA":"2",
         "SPAIN":"1"
      },
      "AppVersion":{
         "1.3.4":"2",
         "1.3.5":"1"
      }
   }
}

此外，输入文件“some-file”不是有效的 JSON 文件，有什么建议如何将其转换为有效(在代码中)？

The original file is (1 line each object):
{   "A":"ALL",   "B":"3349256522",   "Location":{      "Country":"USA"   },   "EffectiveDate":"2020-03-04T14:15:52.063Z",   "Demographic":{      "Q":"done",      "G":"ok",      "AppVersion":"1.3.4"   },   "ApplicationId":"92398723892937",   "Id":"23232993939333",   "CreationDate":"2020-03-04T14:15:52.063Z"}
{   "A":"ALL",   "B":"3349256522",   "Location":{      "Country":"SPAIN"   },   "EffectiveDate":"2020-03-04T14:15:52.063Z",   "Demographic":{      "Q":"done",      "G":"ok",      "AppVersion":"1.3.5"   },   "ApplicationId":"92398723892937",   "Id":"23232993939333",   "CreationDate":"2020-03-04T14:15:52.063Z"}
{   "A":"ALL",   "B":"3349256522",   "Location":{      "Country":"ITALY"   },   "EffectiveDate":"2020-03-04T14:15:52.063Z",   "Demographic":{      "Q":"done",      "G":"ok",      "AppVersion":"1.3.4"   },   "ApplicationId":"92398723892937",   "Id":"23232993939333",   "CreationDate":"2020-03-04T14:15:52.063Z"}

Answer 1

您可以使用array.reduce累计计数值:

let input = [{
   "A":"ALL",
   "B":"3349256522",
   "Location":{
      "Country":"USA"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.4",
   },
   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-04T14:15:52.063Z"
},
{
   "A":"NONE",
   "B":"8469256522",
   "Location":{
      "Country":"SPAIN"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.5",
   },

   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-09T14:15:52.063Z"
},
{
   "A":"ALL",
   "B":"8469256522",
   "Location":{

      "Country":"USA"
   },
   "EffectiveDate":"2020-03-04T14:15:52.063Z",
   "Demographic":{
      "Q":"done",
      "G":"ok",
      "AppVersion":"1.3.4",
   },

   "ApplicationId":"92398723892937",
   "Id":"23232993939333",
   "CreationDate":"2020-03-11T14:15:52.063Z"
}];

let result = input.reduce((acc,current) => {
    let c = current.Location.Country;
    let v = current.Demographic.AppVersion;
    if(acc.Country[c]){
        acc.Country[c]++;
    } else {
        acc.Country[c] = 1;
    }
    
    if(acc.AppVersion[v]){
        acc.AppVersion[v]++;
    } else {
        acc.AppVersion[v] = 1;
    }
    return acc;
}, {Country: {}, AppVersion: {}});

console.log({ stats: result });