Pagination code for Node

//logic
exports.getProducts = (req, res, next) => {
  const page = +req.query.page || 1;
  let totalItems;

  Product.find()
    .countDocuments()
    .then(numProducts => {
      totalItems = numProducts;
      return Product.find()
        .skip((page - 1) * ITEMS_PER_PAGE)
        .limit(ITEMS_PER_PAGE);
    })
    .then(products => {
      res.render('shop/product-list', {
        prods: products,
        pageTitle: 'Products',
        path: '/products',
        currentPage: page,
        hasNextPage: ITEMS_PER_PAGE * page < totalItems,
        hasPreviousPage: page > 1,
        nextPage: page + 1,
        previousPage: page - 1,
        lastPage: Math.ceil(totalItems / ITEMS_PER_PAGE)
      });
    })
    .catch(err => {
      const error = new Error(err);
      error.httpStatusCode = 500;
      return next(error);
    });
};



//view


<section class="pagination">
    <% if (currentPage !== 1 && previousPage !== 1) { %>
        <a href="?page=1">1</a>
    <% } %>
    <% if (hasPreviousPage) { %>
        <a href="?page=<%= previousPage %>"><%= previousPage %></a>
    <% } %>
    <a href="?page=<%= currentPage %>" class="active"><%= currentPage %></a>
    <% if (hasNextPage) { %>
        <a href="?page=<%= nextPage %>"><%= nextPage %></a>
    <% } %>
    <% if (lastPage !== currentPage && nextPage !== lastPage) { %>
        <a href="?page=<%= lastPage %>"><%= lastPage %></a>
    <% } %>
</section>