无法在MEAN-Stack应用中上传图片

Question

So I have a mean stack app. At a user's profile page I want them to be able to upload an image.

Now, I start by selecting it in the template, then through the component it reaches the service file where I make a POST request with formData. In the back-end I used Multer middleware to handle the upload, but something goes wrong here. The following is my code on the back-end.

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

router.post('/uploadProfilePicture/:userId', upload.single('avatar'), function(req, res){
    console.log('entered');
    console.log(req.file);
    console.log(req.body);
    res.status(200).json({
        msg: 'guuud'
    })
});

I mostly just want to check if I reach the back-end. The console gives me the following error:

POST /user/uploadProfilePicture/5aaf1b7c18f2aa3d88e3b59e 500 16.382 ms - 1711

There's no console log of entered and neither of the other ones. Something goes wrong between the service and the back-end, but I have absolutely no idea.

Here are the service and other files used for this upload.

Service.component.ts

postFile(fileToUpload: File, userId) {
        const formData: FormData = new FormData();
        console.log(fileToUpload);
        formData.append('fileKey', fileToUpload, fileToUpload.name);
        console.log(formData);

        return this.http.post("http://localhost:3200/user/uploadProfilePicture/" + userId, formData)
            .map(() => { return true; })
            .catch((e) => this.handleError(e));
    }

Here is the page + the results of the console.logs in the service file

profile.component.ts

handleFileInput(files: FileList){
    this.fileToUpload = files.item(0);
    this.uploadFileToActivity();
}

uploadFileToActivity() {
    this.userService.postFile(this.fileToUpload, localStorage.getItem('userId')).subscribe(data => {
        console.log(data)
    }, error => {
        console.log(error);
    });
}

profile.component.html

<div class="col-md-8 col-md-offset-2 profilePicSection">
        <div class="form-group">
            <label for="file">Choose File</label>
            <input type="file"
                   id="file"
                   (change)="handleFileInput($event.target.files)">
        </div>
    </div>

Edit: The error my server console gives me:

Error: Unexpected field
    at makeError (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\multer\lib\make-error.js:12:13)
    at wrappedFileFilter (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\multer\index.js:40:19)
    at Busboy.<anonymous> (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\multer\lib\make-middleware.js:114:7)
    at Busboy.emit (events.js:159:13)
    at Busboy.emit (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\busboy\lib\main.js:38:33)
    at PartStream.<anonymous> (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\busboy\lib\types\multipart.js:213:13)
    at PartStream.emit (events.js:159:13)
    at HeaderParser.<anonymous> (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\dicer\lib\Dicer.js:51:16)
    at HeaderParser.emit (events.js:159:13)
    at HeaderParser._finish (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\dicer\lib\HeaderParser.js:68:8)
    at SBMH.<anonymous> (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\dicer\lib\HeaderParser.js:40:12)
    at SBMH.emit (events.js:159:13)
    at SBMH._sbmh_feed (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\streamsearch\lib\sbmh.js:159:14)
    at SBMH.push (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\streamsearch\lib\sbmh.js:56:14)
    at HeaderParser.push (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\dicer\lib\HeaderParser.js:46:19)
    at Dicer._oninfo (C:\Users\TijlD\Desktop\test\moviemeter\node_modules\dicer\lib\Dicer.js:197:25)

Answer 1

I use this code for video type files and it works fine, Hope it helps you

var storage = multer.diskStorage({
    destination: function (req, file, callback) {

            var fileDest = path.join('../uploads/');
            if (!fs.existsSync(fileDest)) {
                mkdirp(fileDest, function (err) {
                    if (err) {
                        logger.error(err);
                        callback(err, false);
                    } else {
                        callback(null, '../uploads');
                    }
                });
            } else {
                callback(null, '../uploads/');
            }

    },
    filename: function (req, file, callback) {
        callback(null, file.fieldname + '.' + file.originalname.split('.')[1]);
    }
});

var upload = multer({
    storage: storage,
    fileFilter: function (req, file, callback) {

        // To reject this file pass `false`, like so:
        var sw = 0;
        for (var i = 0; i < config.videoMimeTypes.length; i++) {
            if (file.mimetype === config.videoMimeTypes[i]) {
                sw = 1;
                break;
            }
        }
        if (sw === 0) {
            logger.error('Not allowed file type sent');
            // return callback(new Error('Only video files are allowed!'));
            return callback('Only video files are allowed!', false);
        }

        // To accept the file pass `true`, like so:
        callback(null, true);

    },
    limits: {
        fileSize: config.maxUploadSize
    }
});

app.post('/upload', upload.any(), router.uploader);