Simple Express image route upload for CKEditor with multer middleware

image.js

multer  = require('multer');

var storage = multer.diskStorage({
	destination: function (req, file, cb) {
		cb(null, 'public/uploads/images/')
	}
});
var upload = multer({ storage: storage });

module.exports = function (app) {

router.post('/', upload.single('upload') ,function(req, res){
   var html;
   var fs = require('fs');
  fs.readFile(req.file.path, function (err, data) {
    if(err) {
      res.send({error : err})
    }
    else{
      
        html = "";
        html += "<script type='text/javascript'>";
        html += "    var funcNum = " + req.query.CKEditorFuncNum + ";";
        html += "    var url     = \"/uploads/image/" + req.file.filename + "\";";
        html += "    var message = \"Uploaded file successfully\";";
        html += "";
        html += "    window.parent.CKEDITOR.tools.callFunction(funcNum, url, message);";
        html += "</script>";
        
        res.send(html);
        }
    });
  });
app.use('/image'  , router);
};