Node.js - Extracting values from formdata

Question

I have to create an upload function where admins can upload a report for a certain user.

I have access to this data

• User ID (Number)
• Report Type (Number)
• Report (File)

When an an admin uploads a report, I want to create a directory if it doesn't exist yet like this

var location = __dirname + '/../../public/' + USERID + 'reports/' + filename;

I've been following this tutorial to upload a file and so this is the code I have

function uploadReport(req, res) {
    var fstream;
    var location = __dirname + '/../../public/reports/' + filename;
    if (req.busboy) {
        req.busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
            fstream = fs.createWriteStream(location);
            file.pipe(fstream);
            fstream.on('close', function () {
                console.log('file ' + filename + ' uploaded');
            });
        });
        req.busboy.on('finish', function () {
            res.json({
                success: true
            });
        });
        req.pipe(req.busboy);
    }
}

this is what I sent from my front end

------WebKitFormBoundaryvS6HEnoxsgpmx646
Content-Disposition: form-data; name="participant"

1
------WebKitFormBoundaryvS6HEnoxsgpmx646
Content-Disposition: form-data; name="type"

1
------WebKitFormBoundaryvS6HEnoxsgpmx646
Content-Disposition: form-data; name="file"; filename="test.pdf"
Content-Type: application/pdf


------WebKitFormBoundaryvS6HEnoxsgpmx646--

How can I extract participant and type from my form data and put them into useable variables?