How can i compress image size with multer on upload?

How can i make compression on image size on upload, i will have a lot of files in my S3 bucket so i need this.

How can i transofrm this code do to that ?

app.post('/api/v1/upload', upload.array('image', 1), (req, res) => {
  res.send({ image: req.file });
});


aws.config.update({
  secretAccessKey: process.env.SECRET_ACCESS_KEY,
  accessKeyId: process.env.ACCESS_KEY_ID,
  region: 'us-east-1' //E.g us-east-1
});

const s3 = new aws.S3();


const fileFilter = (req, file, cb) => {
  if (file.mimetype === 'image/jpeg' || file.mimetype === 'image/png') {
    cb(null, true);
  } else {
    cb(new Error('Invalid file type, only JPEG and PNG is allowed!'), false);
  }
};


const upload = multer({
  fileFilter: fileFilter,
  storage: multerS3({
    acl: 'public-read',
    s3,
    bucket: 'oldst123',
    key: function(req, file, cb) {
      req.file = file.originalname;
      cb(null, file.originalname);
    }
  })
});