Kendo UI Angular Upload File to Backend as Node.JS

I am using Kendo Upload Control to upload files to Node.js backend which used GridFS multer.

Angular

<kendo-upload 
  [saveField]="file"
  [withCredentials]="false"
  [saveUrl]="uploadUrl"
  (autoUpload)="false"
  [multiple]="false"
  (select)="selectProfilePic($event)"></kendo-upload>

But the node.js API doesn't pick up the request. I am using [saveField]="file" to pass the uploaded file and the node.js below.

var storage = new GridFsStorage({
    //url: mongoose.connection.client.s.url,
    //options: options,
    db: mongoose.connection,
    file: (req, file) => {
      return new Promise((resolve, reject) => {
        myCrypto.randomBytes(16, (err, buf) => {
          if (err) {
            return reject(err);
          }
          const filename = buf.toString('hex') + path.extname(file.originalname);
          const fileInfo = {
            filename: filename,
            bucketName: 'uploads'
          };
          resolve(fileInfo);
        });
      });
    }
  });



const upload = multer({ storage });
router.post('/upload', upload.single('file'), fileUpload);

module.exports = router;

function fileUpload(req, res) {

 console.log("fileUpload")
  try {
    res.send({ file: req.file })
  }
  catch(err){

    console.log(err);
    res.send(err)
  }
}

Logs

2019-07-21T19:34:33.679205+00:00 app[web.1]: File Controller 2019-07-21T19:34:33.680436+00:00 app[web.1]: {} 2019-07-21T19:34:33.983631+00:00 app[web.1]: MulterError: Unexpected field 2019-07-21T19:34:33.983647+00:00 app[web.1]: at wrappedFileFilter (/app/node_modules/multer/index.js:40:19) 2019-07-21T19:34:33.983649+00:00 app[web.1]: at Busboy. (/app/node_modules/multer/lib/make-middleware.js:114:7) 2019-07-21T19:34:33.983650+00:00 app[web.1]: at Busboy.emit (events.js:198:13) 2019-07-21T19:34:33.983670+00:00 app[web.1]: at Busboy.emit (/app/node_modules/busboy/lib/main.js:38:33) 2019-07-21T19:34:33.983671+00:00 app[web.1]: at PartStream. (/app/node_modules/busboy/lib/types/multipart.js:213:13) 2019-07-21T19:34:33.983673+00:00 app[web.1]: at PartStream.emit (events.js:198:13) 2019-07-21T19:34:33.983674+00:00 app[web.1]: at HeaderParser. (/app/node_modules/dicer/lib/Dicer.js:51:16) 2019-07-21T19:34:33.983675+00:00 app[web.1]: at HeaderParser.emit (events.js:198:13) 2019-07-21T19:34:33.983677+00:00 app[web.1]: at HeaderParser._finish (/app/node_modules/dicer/lib/HeaderParser.js:68:8) 2019-07-21T19:34:33.983678+00:00 app[web.1]: at SBMH. (/app/node_modules/dicer/lib/HeaderParser.js:40:12) 2019-07-21T19:34:33.983679+00:00 app[web.1]: at SBMH.emit (events.js:198:13) 2019-07-21T19:34:33.983680+00:00 app[web.1]: at SBMH._sbmh_feed (/app/node_modules/streamsearch/lib/sbmh.js:159:14) 2019-07-21T19:34:33.983682+00:00 app[web.1]: at SBMH.push (/app/node_modules/streamsearch/lib/sbmh.js:56:14) 2019-07-21T19:34:33.983683+00:00 app[web.1]: at HeaderParser.push (/app/node_modules/dicer/lib/HeaderParser.js:46:19) 2019-07-21T19:34:33.983685+00:00 app[web.1]: at Dicer._oninfo (/app/node_modules/dicer/lib/Dicer.js:197:25) 2019-07-21T19:34:33.983686+00:00 app[web.1]: at SBMH. (/app/node_modules/dicer/lib/Dicer.js:127:10) 2019-07-21T19:34:33.989908+00:00 heroku[router]: at=info method=POST path="/v1/file/upload" host=herokuapp.com request_id=aa1010df-d244-46bc-9b36-f8e437d5ad2a fwd="80.233.46.84" dyno=web.1 connect=0ms service=312ms status=500 bytes=286 protocol=https

Is there any chance you had to set the field name to some file variable? So, I believe you expected [saveField]="file" to set field name to 'file' string but instead it searches for some this.filevariable which is undefined so you got field name set to the default 'files' value?