无法在multer中更改目的地

Question

When i upload my form (which just contains an image), the image goes in the root folder, but I would like it to go to /public/images. I have a separate routes.js file to handle routes. This is how I've set up multer (in my routes.js file).

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

The route for the POST request looks like this:

app.post('/upload', isLoggedIn, upload.single('file'), function (req, res) {
        var file = __dirname + req.file.filename;
        fs.rename(req.file.path, file, function (err) {
            if (err) {
                console.log(err);
                res.send(500);
            } else {
                res.json({
                    message: 'File uploaded successfully',
                    filename: req.file.filename
                });
            console.log(file);
            }
        });
    });

, and the form itself looks like this (it's an ejs file):

<form method="post" action="/upload" enctype="multipart/form-data">
                    <label for="profilepicture">Profile picture</label>
                    <input type="file" name="file" accept="image/*">
                    <input type="submit" value="change profile picture">    
                    </form>

Answer 1

You are providing a wrong path in the dest , it's a relative path so it should be dest: 'public/' instead of dest: '/public'

Also, you are moving the file from the public folder by using fs.rename and the reason it is moved to outside the root folder is you are adding the root folder in the filename and not as a path :

var file = __dirname + req.file.filename;

should be :

var file = __dirname + '/' + req.file.filename;

or even better :

var file = path.join(__dirname, req.file.filename);

Overall, a working script with no need for the fs.rename :

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

app.post('/upload', isLoggedIn, upload.single('file'), function (req, res) {
  res.json({
    message: 'File uploaded successfully',
    filename: req.file.filename
  })
})