JSON對象沒有被傳遞給函數

Question

我有一個應用程序，它允許CSV文件上傳，轉換CSV通過csvtojson成JSON，然後導入到JSON蒙戈DB通過貓鼬。

絕大多數的這一工程，但由於某種原因，我無法導入腳本動態獲取新生成的JSON，但它是很好那我硬編碼路徑JSON。

我有一個轉換腳本，它是這樣的，似乎是在做它的工作正常（即當一個文件被上傳的叫法，轉換CSV到JSON，然後刪除上傳CSV）

var convertJSON = function convertJSON(inputFile, callback) { 


var fs = require('fs'); 
const csv=require('csvtojson'); 
console.log('NOW I AM IN convertJSONOriginal'); 

const converter=csv({ 
    noheader:true, 
    headers: ['date','vendor','amount'], 
    trim:false 
}) 
    .fromFile('./data/' + inputFile,function(err,result){ 
     // if an error has occured then handle it 
     if(err){ 
      console.log("An Error Has Occurred"); 
      console.log(err); 
     } 
     // create a variable called json and store 
     // the result of the conversion 

     //var json = result; 
     var json = JSON.stringify(result); 

     fs.writeFile('./data/' + inputFile.split('.')[0] + '.json', json, function(err) { 
      if(err) { 
       return console.log(err); 
      } 

      console.log("The file was saved!"); 
      //TODO delete the imported csv file 
      fs.unlink("./data/" + inputFile, function (err) { 
       if (err) { 
        console.log("failed to delete local file:"+err); 
       } else { 
        console.log('successfully deleted local file'); 
       } 
      }); 
      var jsonFile = inputFile.split('.')[0] + '.json' ; 
      console.log('THIS IS jsonfile AS IT COMES FROM convertJSONOriginal' +jsonFile); 
      callback(err,jsonFile); 
     }); 

    }); 
}; 


module.exports = { 
convertJSON: convertJSON 
}; 

我有SO基本上如果I 'CONSOLE.LOG（語句）' 從硬編碼var statements= require("../data/HSBC-1493565387017.json");（其中../data/HSBC-1493565387017.json是文件調用該函數

var express = require("express"); 
var multer = require('multer'); 
var router = express.Router(); 
var path = require('path'); 
var runScript = require('../helpers/runScript'); 
var convertJSON = require('../helpers/convertJSONOriginal'); 
var upload = require('../helpers/statement-seeder'); 

/* 
    The below hardcoded path will allow the call to console.log('AND THIS 
WITH statements '+JSON.stringify(statements)); 
    to print out an object 
*/ 

var statements= require("../data/HSBC-1493565387017.json"); 

var storage = multer.diskStorage({ 
    destination: function(req, file, callback) { 
     callback(null, './data') 
    }, 
    filename: function(req, file, callback) { 
    callback(null, req.body.bank + '-' + Date.now() + 
path.extname(file.originalname)) 

    } 
}); 


router.post('/', 
    multer({ 
     storage: storage, 
     fileFilter: function(req, file, callback) { 
      var ext = path.extname(file.originalname) 
      if (ext !== '.csv') { 
       return callback(res.end('Only csvs are allowed'), null) 
      } 
      callback(null, true) 
     } 
    }) 
     .single('statement'), //this is the name of the form field to get the file from 
function(req, res) { 
    console.log('THIS IS THE FILENAME - '+req.file.filename); 
    convertJSON.convertJSON(req.file.filename, function(err, filename){ 
     if (err){ 
      console.log(err); 
     } else { 
      //prints out AND THIS WITH ../data "../data/HSBC-1493565431073.json" to console 

console.log('THIS IS WITH ../data '+JSON.stringify('../data/'+filename)); 
      //prints out AND THIS WITH data "/data/HSBC-1493565431073.json" to console 

console.log('AND THIS WITH /data '+JSON.stringify('/data/'+filename)); 
      //prints out AND THIS WITH ./data "./data/HSBC-1493565431073.json" to console 

console.log('AND THIS WITH ./data '+JSON.stringify('./data/'+filename)); 
      //prints out the json object to console 

console.log('AND THIS WITH statements '+JSON.stringify(statements)); 
      //upload.statementSeeder(filename); 
      //upload.statementSeeder(statements); 

     } 
    }); 

}); 

module.exports = router; 

一個upload.js路線已經通過我寫的代碼上傳和轉換en），然後我看到完整的json對象，但是如果我從給定回調的值console.log然後它只打印文件的路徑。

誰能告訴我我做錯了什麼？

編輯迴應質疑： 看的typeof爲filename（這是req.file.filename通過從JSON轉換腳本背部和不同的上面，如果我的想法/代碼是正確上傳的每個文件） console.log('HERE IS THE TYPEOF for filename'+ typeof filename);回報string。 但console.log('HERE IS THE TYPEOF for statement'+ typeof statements);其中statements是硬編碼到一個實際位置轉換的JSON文件var statements= require("../data/HSBC-1493565387017.json");返回object。

Answer 1

OK，我已經添加了的下面，如果你想閱讀文件內容打開JSON文件爲對象，現在傳遞給回調

var obj; 
fs.readFile('./data/' + inputFile.split('.')[0] + '.json', 'utf8', 
    function (err, data) { 
     if (err) throw err; 
     obj = JSON.parse(data); 
       //console.log(obj); 
       callback(err,obj); 
     });