Deprecation errors in mongoDB, where should I pass the parameters?

I'm using mongoDB to store 2 files, and I get those messages:

DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

this is my code, I have no idea where should I pass those options to:

var storageImage = new GridFsStorage({
  url: dbURI,
  file: (req, file) => {
    return new Promise((resolve, reject) => {
      crypto.randomBytes(16, (err, buf) => {
        if (err) {
          return reject(err);
        }
        const filename = buf.toString("hex") + path.extname(file.originalname);
        const fileInfo = {
          filename: filename,
          bucketName: "user_images"
        };
        resolve(fileInfo);
      });
    });
  }
});
const uploadImage = multer({ storage: storageImage });

var storageDoc = new GridFsStorage({
  url: dbURI,
  file: (req, file) => {
    return new Promise((resolve, reject) => {
      crypto.randomBytes(16, (err, buf) => {
        if (err) {
          return reject(err);
        }
        const filename = buf.toString("hex") + path.extname(file.originalname);
        const fileInfo = {
          filename: filename,
          bucketName: "user_cv"
        };
        resolve(fileInfo);
      });
    });
  }
});
const uploadDoc = multer({ storage: storageDoc });

//routes

router.post("/uploadImage", uploadImage.single("file"), (req, res) => {
  console.log(req.file);
  res.json({ imageId: req.file.id });
});

router.post("/uploadCV", uploadDoc.single("file"), (req, res) => {
  console.log(req.file);
  res.json({ cvId: req.file.id });
});

module.exports = router;

Try like this. Adding this line should work options: { useNewUrlParser: true }.

new GridFsStorage({
  url: dbURI,
  options: { useNewUrlParser: true },
  ...,
});