javascript - 在子进程中读取 JSON 文件

Question

我有两个相关的 Node 应用程序。其中一个是使用子进程 exec 方法从另一个调用的。在提到的应用程序中，我正在使用此方法读取一些 JSON 文件:

function readAsync(files, configs, callBack) {
var result = [];
files.forEach(function (item, i) {
    result = result.concat(JSON.parse(fs.readFileSync(item, { encoding: 'utf8' })));
    if (i === files.length - 1 && typeof (callBack) === 'function') {
        var _ret = _.chain(result)
            .uniqBy(function (x) { return x.url })
            .sortBy(function (x) { return x.title })
            .value();
        filterByConfigs(_ret, configs, function (filteredResult) {
            callBack(filteredResult);
        });
    }
})}

我在读取和解析 JSON 文件时遇到此错误。但是，当我独立运行子应用程序时，没有任何错误和问题。

undefined:1

SyntaxError: Unexpected end of JSON input
    at Object.parse (native)
    at E:\Open Source Projects\src\cli\readFiles.js:30:37
    at Array.forEach (native)
    at readAsync (E:\Open Source Projects\src\cli\readFiles.js:29:11)
    at E:\Open Source Projects\src\cli\readFiles.js:19:9
    at E:\Open Source Projects\src\cli\getJsonFiles.js:18:13
    at FSReqWrap.oncomplete (fs.js:123:15)

JSON 文件示例:

[
  {
    "title": "Document Manager",
    "subTitle": "Document manager - indexing, Filter file and rename - delete - share document.",
    "url": "https://play.google.com/store/apps/details?id=com.document.manager.filescanner&hl=en&gl=us",
    "appId": "com.document.manager.filescanner",
    "price": "0",
    "minInstalls": 1000000,
    "score": 4.2,
    "version": "1.4"
  },
  {
    "title": "Mini Scanner - PDF Scanner App",
    "subTitle": "Fast easy way to scanner, professional pdf documents, Support SD card + Send Fax",
    "url": "https://play.google.com/store/apps/details?id=com.simplescan.miniscanner&hl=en&gl=us",
    "appId": "com.simplescan.miniscanner",
    "price": "0",
    "minInstalls": 100000,
    "score": 4.6,
    "version": "1.0.9"
  }
]

有人遇到过这种情况吗？谢谢。

Answer 1

我运行下面的代码尝试模拟问题，当文件有不完整或损坏的 json 时，我得到了结果。在尝试记录读取/解析错误时，您能否验证在 console.log 中获得的内容？

var fs = require("fs");
function readAsync(files, configs, callBack) {
    var result = [];
    files.forEach(function (item, i) {

      console.log("reading file:", item);
      try{
          result = result.concat(JSON.parse(fs.readFileSync(item, { encoding: 'utf8' })));
      }catch(ex){
          console.log("bad file :c :", item, ex);
      }
      if (i === files.length - 1 && typeof (callBack) === 'function'){
            callBack(result);
      }
  });
}

readAsync([ "test.json" ], null, function(obj){
  console.log(obj);
});