Add Multiple Products to Cart using Promises.

woocommerce-add-multiple-products-to-cart.js

const productsToAdd = [
    { 'add-to-cart': 68, 'quantity': 2 },
    { 'add-to-cart': 69, 'quantity': 3 },
    { 'add-to-cart': 70, 'quantity': 4 }
];

for (const product of productsToAdd) {
    try {
        const response = await fetch(window.location.pathname, {
            method: 'POST',
            body: new URLSearchParams(product),
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            }
        })
        if (response.ok) {
            console.log('Product added to cart:', product['add-to-cart']);
        }
    } catch (e) {
        console.error(e);
    }
};