upload file nodejs

upload.js

 const form = new formidable.IncomingForm();
    form.parse(req, (err, fields, files) => {
        const oldPath = files.file.path;
        const newPath = path.join(process.cwd(), '/uploads/', files.file.name);
        fs.rename(oldPath, newPath, (errRn) => {
            if (errRn) {
                res.status(500);
                res.json({ success: false });
                return;
            }
            csvToJson(newPath);
            res.setHeader('Access-Control-Allow-Origin', '*');
            res.status(200);
            res.json({ success: true });
        });
    });