I am using the jQuery Form Plugin and multer to upload files to my server. This works just fine, but I am trying to pass an additional parameter, which will determine where exactly the file will be saved.

I have following code, which I would like to extend to behave as stated:

HTML

<form id="uploadForm"
      enctype="multipart/form-data"
      action="/files"
      method="post">
    <input type="file" id="userFile" name="userFile"/>
    <input type="text" hidden id="savePath" name="savePath" value="path"/>
</form>

Client JS

uploadForm.submit(function() {
    $(this).ajaxSubmit({

        error: function(xhr) {
            console.log('Error: ' + xhr.status);
        },

        success: function(response) {
            console.log('Success: ' + response);
        }
    });

    return false;
});

Node.js Route

app.post(APIpath + "file",function(req,res){
    var storage = multer.diskStorage({
        destination: absoluteServePath+ "/" + config.filePath,
        filename: function (req, file, cb) {
            cb(null, file.originalname);
        }
    });
    var upload = multer({ storage : storage}).any();

    upload(req,res,function(err) {
        if(err) {
            console.log(err);
            return res.end("Error uploading file.");
        }
        res.end("File has been uploaded");
    });
});

Note: I know I am not checking for mimetypes or sanitizing the user files, but it is mainly secondary for me right now.

The problem is that multer that saves files first, and only then writes to req the remaining part of the form - such as hidden fields.

Try this:

app.post(APIpath + "file",function(req,res){
    var storage = multer.diskStorage({
        destination: tmpUploadsPath
    });
    var upload = multer({ storage : storage}).any();

    upload(req,res,function(err) {
        if(err) {
            console.log(err);
            return res.end("Error uploading file.");
        } else {
           console.log(req.body);
           req.files.forEach( function(f) {
             console.log(f);
             // and move file to final destination...
           });
           res.end("File has been uploaded");
        }
    });
});