Дмитрий Беляев

<div  v-for="product in products" class="row product-row" @click="setcookie(product)">
<script>
methods: {
  setcookie(product) {
    document.cookie = 'app_cookie_name=' + product.name;
    console.log(document.cookie);
  },
}
</script>

const {promisify} = require('util');
const query = promisify(connection.query.bind(connection));

async function getSomethingFromDB() { // не знаю какое имя у Вас в оригинале
  const result = await query(" SELECT * FROM `tb_1` WHERE `id`=? ", [id]);
  const array = [];
  for (var i in result) {
    // ...
   const result_2 = await query(" SELECT * FROM `tb_2` WHERE `id`=? ", [id]);
    // ...
  }
}

$('#click').on('click', 'submit', function() {
    // 5 min == 300sec
    document.cookie = 'userSubmitClick=1; path=/; max-age=300';
});

const Second = ({array}) => {
    return (...)
}

const Second = (props) => {
    const {array} = props;
    return (...)
}

const Second = (props) => {
    const array = props.array;
    return (...)
}

const mysql = require('some-mysql-library');
const app = express();
// ...
function getUserFromMysqlMiddleware(req, res, next) {
  mysql.query('SELECT * FROM `users` WHERE `id`=? LIMIT 1', [req.query.userid]).then(([user]) => {
    if(!user) {
      const err = new Error('Access denied');
      err.status = 403;
      return next(err);
    }
    req.user = user;
    next();
  }).catch(next);
}
app.post('/some/route', getUserFromMysqlMiddleware, (req, res) => {
  // Ваш код с гарантированным наличием req.user
});
app.put('/some/route', getUserFromMysqlMiddleware, (req, res) => {
  // Ваш код с гарантированным наличием req.user
});

module.exports = {
    devtool: "source-map",
    entry: ["./src/main.sass", "./src/index.js"],
    // ...