multer npm 모듈을 사용하여 파일을 앱에 업로드하려고합니다.

내가 정의한 multer 기능은 파일 시스템에 단일 파일을 업로드하는 것입니다. 런타임 동안 모든 것이 작동합니다. 문제는 파일을 업로드 한 후 아래 오류가 발생합니다. 어디를보아야하는지 조언을 부탁드립니다.

오류:

Unexpected field

Error: Unexpected field
    at makeError (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\lib\make-error.js:12:13)
    at wrappedFileFilter (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\index.js:39:19)
    at Busboy.<anonymous> (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\lib\make-middleware.js:97:7)
    at Busboy.emit (events.js:118:17)
    at Busboy.emit (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\node_modules\busboy\lib\main.js:31:35)
    at PartStream.<anonymous> (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\node_modules\busboy\lib\types\multipart.js:205:13)
    at PartStream.emit (events.js:107:17)
    at HeaderParser.<anonymous> (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\Dicer.js:51:16)
    at HeaderParser.emit (events.js:107:17)
    at HeaderParser._finish (c:\Users\Dev\WebstormProjects\Crunch\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\HeaderParser.js:70:8) 

app.js

var multer = require('multer');
var app = express();
var fs = require('fs');

//. . . 

var upload = multer({ dest: 'upload/'});
var type = upload.single('file');

app.post('/upload', type, function (req,res) {
  var tmp_path = req.files.recfile.path;
  var target_path = 'uploads/' + req.files.recfile.name;
fs.readFile(tmp_path, function(err, data)
{
  fs.writeFile(target_path, data, function (err)
  {
    res.render('complete');
  })
});

Index.hbs

<form action="/upload" method="post" enctype="multipart/form-data">
    <input type="file" name='recfile' placeholder="Select file"/>
    <br/>
    <button>Upload</button>
</form>

#Package.json
  "dependencies": {
    "body-parser": "~1.13.2",
    "cookie-parser": "~1.3.5",
    "debug": "~2.2.0",
    "easy-zip": "0.0.4",
    "express": "~4.13.1",
    "hbs": "~3.1.0",
    "less-middleware": "1.0.x",
    "morgan": "~1.6.1",
    "multer": "~1.0.0",
    "serve-favicon": "~2.3.0"
  }
}

답변

var multer  = require('multer');
var upload = multer({ dest: 'upload/'});
var fs = require('fs');

/** Permissible loading a single file,
    the value of the attribute "name" in the form of "recfile". **/
var type = upload.single('recfile');

app.post('/upload', type, function (req,res) {

  /** When using the "single"
      data come in "req.file" regardless of the attribute "name". **/
  var tmp_path = req.file.path;

  /** The original name of the uploaded file
      stored in the variable "originalname". **/
  var target_path = 'uploads/' + req.file.originalname;

  /** A better way to copy the uploaded file. **/
  var src = fs.createReadStream(tmp_path);
  var dest = fs.createWriteStream(target_path);
  src.pipe(dest);
  src.on('end', function() { res.render('complete'); });
  src.on('error', function(err) { res.render('error'); });

});

   var formData = new FormData();
   formData.append('<NAME>',this.new_attachments)

   app.post('/upload', upload.single('<NAME>'),...

 const express        = require('express');
 const bodyParser     = require('body-parser');
 const app = express();
 var multer = require('multer');
 const port = 8000;
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: true }));

 app.listen(port, ()=>{
 console.log('We are live on' + port);
 });

 var upload = multer({dest:'./upload/'});

 app.post('/post', upload.single('file'), function(req, res) {
  console.log(req.file);
 res.send("file saved on server");
 });

var filename = req.file.filename;
var mimetype = req.file.mimetype;
mimetype = mimetype.split("/");
var filetype = mimetype[1];
var old_file = configUploading.settings.rootPathTmp+filename;
var new_file = configUploading.settings.rootPathTmp+filename+'.'+filetype;
rname(old_file,new_file);

function wrappedFileFilter (req, file, cb) {
  if ((filesLeft[file.fieldname] || 0) <= 0) {
    return cb(makeError('LIMIT_UNEXPECTED_FILE', file.fieldname))
  }

  filesLeft[file.fieldname] -= 1
  fileFilter(req, file, cb)
}

'LIMIT_UNEXPECTED_FILE': 'Unexpected field'

var theinput = document.getElementById('myfileinput')
var data = new FormData()
data.append('myfile',theinput.files[0])
fetch( "/upload", { method:"POST", body:data } )

app.post('/upload', multer(multerConfig).single('myfile'),function(req, res){
  res.sendStatus(200)
}

{thumbbail: <myimg>}

upload.single('thumbnail')