Node.js TypeError: Cannot read property 'path' of undefined

Question

I've looked at a lot of answer for this same question, but I haven't found a working solution yet. I am trying to make a web app that you can upload files to using express and multer, and I am having a problem that no files are being uploaded and req.file is always undefined.

Express and multer version as: "express": "^4.15.4", "multer": "^1.3.0"

My configure.js looks this:

multer = require('multer');

module.exports = function(app) {
app.use(morgan('dev'));
app.use(multer({
    dest: path.join(__dirname, 'public/upload/temp')}).single('file'));
routes(app);
app.use('/public/', express.static(path.join(__dirname, '../public')));

Consuming code looks like this:

    var tempPath = req.file.path,
        ext = path.extname(req.file.name).toLowerCase(),
        targetPath = path.resolve('./public/upload/' + imgUrl + ext);

        if (ext === '.png' || ext === '.jpg' || ext === '.jpeg' || ext === '.gif') {
            fs.rename(tempPath, targetPath, function(err) {
                if (err) throw err;

                res.redirect('/images/' + imgUrl);
            });
        } else {
            fs.unlink(tempPath, function() {
                if (err) throw err;

                res.json(500, {error: 'Only image files are allowed.'});
            });
        }

The form looks like this:

    <form method="post" action="/images" enctype="multipart/form-
data">
<div class="panel-body form-horizontal">
    <div class="form-group col-md-12">
        <label class="col-sm-2 control-label"
        for="file">Browse:</label>
        <div class="col-md-10">
            <input class="form-control" type="file"
            name="file" id="file">
        </div>
    </div>

Erwan Legrand · Accepted Answer · 2018-03-29 09:14:00Z

4

I have encountered the same problem. But then I change the multer version back to 0.1.8. Everything works fine. You may need to alter the package.json file: "multer": "^0.1.8"

edited Mar 29, 2018 at 9:14

Erwan Legrand

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answered Mar 29, 2018 at 8:53

Tiga

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Comments

Théophile Pace · Accepted Answer · 2017-09-18 06:43:40Z

0

I bet your error message is on this line

    var tempPath = req.file.path,

because it's the only time you ask for "path" as a property of an object. Your problem seems pretty clear, you have no file in your request (AKA the object called "req"). You should log or inspect the object called req when in your consuming code to make sure you have a file within the request.

answered Sep 18, 2017 at 6:43

Théophile Pace

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3 Comments

hemanik Over a year ago

Yes, you are right the file is undefined. Can you suggest what I am missing here ?

Théophile Pace Over a year ago

Try to do the following: console.log(JSON.stringify(req)) Then look at the object, it may help you. I have not enough things to tell you what's wrong, but if I were I would check the names of the attributes (maybe you did a typo or the attribute you seek is not called that way), I would set several console.log to ensure that what is collected/sent/received is really what you think it is. If you still can't find out, upload a working (I mean a runnable ;) ) example so that we can debug the code.

hemanik Over a year ago

Here is the code, github.com/hemanik/imgPloadr. It's an example from this book

MShaba007 · Accepted Answer · 2023-04-05 14:49:41Z

0

For ReferenceError: path is not defined

add this line

const path = require('node:path');

Hope this will work fine.

answered Apr 5, 2023 at 14:49

MShaba007

765 bronze badges

Comments

showdev · Accepted Answer · 2019-11-12 21:37:00Z

-1

I found that the error "Cannot read property path of undefined" when using multer in find upload was due to the fileFilter option passed in, I was using File I had allowed file of type .png and .jpg only and I kept sending to FormData() file of type jpeg.

Of course this might not be the problem in your case, but worth looking into if you're facing a similar challenge.

edited Nov 12, 2019 at 21:37

showdev

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answered Nov 12, 2019 at 9:42

I_sam

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