How to store a file with file extension with multer?

Question

Managed to store my files in a folder but they store without the file extension.

Does any one know how would I store the file with file extension?

Answer 1

There may be some issues in the already answered codes.

• There may be some cases of files with no extension.
• There should not be an upload.any() usage. Its vulnerable to the attackers
• The upload function should not be global .

I have written the below codes for better security.

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

        cb(null, 'temp/')
    },
    filename: function (req, file, cb) {
        let ext = ''; // set default extension (if any)
        if (file.originalname.split(".").length>1) // checking if there is an extension or not.
            ext = file.originalname.substring(file.originalname.lastIndexOf('.'), file.originalname.length);
        cb(null, Date.now() + ext)
    }
})
var upload = multer({ storage: storage });

Using it for upload

// using only single file object name (HTML name attribute)
// May use upload.array(["file1","file2"]) for more than one
app.post('/file_upload', upload.single("file"), function (req,res) {
    //console.log(req.body, 'Body');
    console.log(req.file, 'file');
    res.send("cool");
})