Product can not be deleted - mongodb

Question

I am having the following problem in my project. I am trying to delete an added product but unfortunately, it cannot be deleted. So let me show you my code.
First I have the Product.js model.
static deleteById(prodId){
const db = getDb();
return db
.collection('products')
.deleteOne({_id: new mongodb.ObjectId(prodId) })
.then(result => {
console.log('Deleted');
})
.catch(err => {
console.log(err);
});
}
Then I use deleteById function in my controller Admin.js file.
exports.postDeleteProduct = (req, res, next) => {
const prodId = req.params.productId;
Product.deleteById(prodId)
.then(() => {
console.log('DESTROYED PRODUCT');
res.redirect('/admin/products');
})
.catch(err => console.log(err));
};
After doing that I am creating the necessary route in the routes->admin.js file.
const path = require('path');
const express = require('express');
const adminController = require('../controllers/admin');
const router = express.Router();
// /admin/add-product => GET
router.get('/add-product', adminController.getAddProduct);
// admin/products => GET
router.get('/products', adminController.getProducts);
// /admin/add-product => POST
router.post('/add-product', adminController.postAddProduct);
router.get('/edit-product/:productId', adminController.getEditProduct);
router.post('/edit-product', adminController.postEditProduct);
router.post('/delete-product', adminController.postDeleteProduct);
module.exports = router;
Finally, there is the HTML file which contains the delete button.
<main>
<% if (prods.length > 0) { %>
<div class="grid">
<% for (let product of prods) { %>
<article class="card product-item">
<header class="card__header">
<h1 class="product__title">
<%= product.title %>
</h1>
</header>
<div class="card__image">
<img src="<%= product.imageUrl %>" alt="<%= product.title %>">
</div>
<div class="card__content">
<h2 class="product__price">$
<%= product.price %>
</h2>
<p class="product__description">
<%= product.description %>
</p>
</div>
<div class="card__actions">
Edit
<form action="/admin/delete-product" method="POST">
<input type="hidden" value="<%= product._id %>" name="productId">
<button class="btn" type="submit">Delete</button>
</form>
</div>
</article>
<% } %>
</div>
<% } else { %>
<h1>No Products Found!</h1>
<% } %>
</main>
<%- include('../includes/end.ejs') %>
Here is my repo.
How can the delete problem be fixed?