Magento 2 how to get custom attribute value in cart page and mini cart

Create File catalog_attributes.xml inside Vendor/Module/etc or any existing module.

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Catalog:etc/catalog_attributes.xsd">
    <group name="quote_item">
     <attribute name="product-arrtibute"/>
    </group>
</config>

Now call that attribute in cart page or minicart like as

if dropdown type attribute

$_item->getProduct()->getAttributeText('product-attribute')

else

$_item->getProduct()->getProductAttribute()

For displaying product attribute in minicart

1. Create file catalog_attributes.xml Vendor/Module/etc

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Catalog:etc/catalog_attributes.xsd">
    <group name="quote_item">
     <attribute name="weight"/>
    </group>
</config>

2.Create di.xml in Vendor/Module/etc

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
   <preference for="Magento\Checkout\CustomerData\DefaultItem" type="Vendor\Module\CustomerData\DefaultItem" />
</config>

3.Create file DefaultItem.php inside Vendor\Module\CustomerData

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Vendor\Module\CustomerData;

use Magento\Framework\App\ObjectManager;

/**
 * Default item
 */
class DefaultItem extends \Magento\Checkout\CustomerData\DefaultItem
{
         /**
         * @var \Magento\Catalog\Helper\Image
         */
        protected $imageHelper;

        /**
         * @var \Magento\Msrp\Helper\Data
         */
        protected $msrpHelper;

        /**
         * @var \Magento\Framework\UrlInterface
         */
        protected $urlBuilder;

        /**
         * @var \Magento\Catalog\Helper\Product\ConfigurationPool
         */
        protected $configurationPool;

        /**
         * @var \Magento\Checkout\Helper\Data
         */
        protected $checkoutHelper;

        /**
         * Escaper
         *
         * @var \Magento\Framework\Escaper
         */
        private $escaper;
    public function __construct(
        \Magento\Catalog\Helper\Image $imageHelper,
        \Magento\Msrp\Helper\Data $msrpHelper,
        \Magento\Framework\UrlInterface $urlBuilder,
        \Magento\Catalog\Helper\Product\ConfigurationPool $configurationPool,
        \Magento\Checkout\Helper\Data $checkoutHelper,
        \Magento\Framework\Escaper $escaper = null
    ) {
        $this->configurationPool = $configurationPool;
        $this->imageHelper = $imageHelper;
        $this->msrpHelper = $msrpHelper;
        $this->urlBuilder = $urlBuilder;
        $this->checkoutHelper = $checkoutHelper;
        $this->escaper = $escaper ?: ObjectManager::getInstance()->get(\Magento\Framework\Escaper::class);
    }

    protected function doGetItemData()
    {
        $imageHelper = $this->imageHelper->init($this->getProductForThumbnail(), 'mini_cart_product_thumbnail');
        $productName = $this->escaper->escapeHtml($this->item->getProduct()->getName());

        return [
            'options' => $this->getOptionList(),
            'qty' => $this->item->getQty() * 1,
            'item_id' => $this->item->getId(),
            'configure_url' => $this->getConfigureUrl(),
            'is_visible_in_site_visibility' => $this->item->getProduct()->isVisibleInSiteVisibility(),
            'product_id' => $this->item->getProduct()->getId(),
            'product_name' => $productName,
            'product_sku' => $this->item->getProduct()->getSku(),
            'product_url' => $this->getProductUrl(),
            'product_has_url' => $this->hasProductUrl(),
            'product_price' => $this->checkoutHelper->formatPrice($this->item->getCalculationPrice()),
            'product_price_value' => $this->item->getCalculationPrice(),
            'weight' => $this->item->getProduct()->getWeight(),
            'product_image' => [
                'src' => $imageHelper->getUrl(),
                'alt' => $imageHelper->getLabel(),
                'width' => $imageHelper->getWidth(),
                'height' => $imageHelper->getHeight(),
            ],
            'canApplyMsrp' => $this->msrpHelper->isShowBeforeOrderConfirm($this->item->getProduct())
                && $this->msrpHelper->isMinimalPriceLessMsrp($this->item->getProduct()),
        ];
    }
    
}
?>

4.Create File default.html inside Current Theme app/design/frontend/Vendor/Themename/Magento_Checkout/web/template/minicart/item

<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<li class="item product product-item" data-role="product-item">
    <div class="product">
        <!-- ko if: product_has_url -->
        <a data-bind="attr: {href: product_url, title: product_name}" tabindex="-1" class="product-item-photo">
            <!-- ko foreach: $parent.getRegion('itemImage') -->
                <!-- ko template: {name: getTemplate(), data: item.product_image} --><!-- /ko -->
            <!-- /ko -->
        </a>
        <!-- /ko -->
        <!-- ko ifnot: product_has_url -->
        <span class="product-item-photo">
            <!-- ko foreach: $parent.getRegion('itemImage') -->
                <!-- ko template: {name: getTemplate(), data: item.product_image} --><!-- /ko -->
            <!-- /ko -->
        </span>
        <!-- /ko -->

        <div class="product-item-details">
            <strong class="product-item-name">
                <!-- ko if: product_has_url -->
                <a data-bind="attr: {href: product_url}, html: product_name"></a>
                <!-- /ko -->
                <!-- ko ifnot: product_has_url -->
                    <!-- ko text: product_name --><!-- /ko -->
                <!-- /ko -->
            </strong>

            <!-- ko if: options.length -->
            <div class="product options" data-mage-init='{"collapsible":{"openedState": "active", "saveState": false}}'>
                <span data-role="title" class="toggle"><!-- ko i18n: 'See Details' --><!-- /ko --></span>

                <div data-role="content" class="content">
                    <strong class="subtitle"><!-- ko i18n: 'Options Details' --><!-- /ko --></strong>
                    <dl class="product options list">
                        <!-- ko foreach: { data: options, as: 'option' } -->
                        <dt class="label"><!-- ko text: option.label --><!-- /ko --></dt>
                        <dd class="values">
                            <!-- ko if: Array.isArray(option.value) -->
                                <span data-bind="html: option.value.join('<br>')"></span>
                            <!-- /ko -->
                            <!-- ko ifnot: Array.isArray(option.value) -->
                                <span data-bind="html: option.value"></span>
                            <!-- /ko -->
                        </dd>
                        <!-- /ko -->
                    </dl>
                </div>
            </div>
            <!-- /ko -->
            <!-- ko if: weight -->
            <div data-bind="html: 'Weight : ' + weight"></div>
            <!-- /ko -->
            <div class="product-item-pricing">
                <!-- ko if: canApplyMsrp -->

                <div class="details-map">
                    <span class="label" data-bind="i18n: 'Price'"></span>
                    <span class="value" data-bind="i18n: 'See price before order confirmation.'"></span>
                </div>
                <!-- /ko -->
                <!-- ko ifnot: canApplyMsrp -->
                <!-- ko foreach: $parent.getRegion('priceSidebar') -->
                    <!-- ko template: {name: getTemplate(), data: item.product_price, as: 'price'} --><!-- /ko -->
                <!-- /ko -->
                <!-- /ko -->

                <div class="details-qty qty">
                    <label class="label" data-bind="i18n: 'Qty', attr: {
                           for: 'cart-item-'+item_id+'-qty'}"></label>
                    <input data-bind="attr: {
                           id: 'cart-item-'+item_id+'-qty',
                           'data-cart-item': item_id,
                           'data-item-qty': qty,
                           'data-cart-item-id': product_sku
                           }, value: qty"
                           type="number"
                           size="4"
                           class="item-qty cart-item-qty">
                    <button data-bind="attr: {
                           id: 'update-cart-item-'+item_id,
                           'data-cart-item': item_id,
                           title: $t('Update')
                           }"
                            class="update-cart-item"
                            style="display: none">
                        <span data-bind="i18n: 'Update'"></span>
                    </button>
                </div>
            </div>

            <div class="product actions">
                <!-- ko if: is_visible_in_site_visibility -->
                <div class="primary">
                    <a data-bind="attr: {href: configure_url, title: $t('Edit item')}" class="action edit">
                        <span data-bind="i18n: 'Edit'"></span>
                    </a>
                </div>
                <!-- /ko -->
                <div class="secondary">
                    <a href="#" data-bind="attr: {'data-cart-item': item_id, title: $t('Remove item')}"
                       class="action delete">
                        <span data-bind="i18n: 'Remove'"></span>
                    </a>
                </div>
            </div>
        </div>
    </div>
</li>