How to autofill custom address in shipping form at checkout page Magento2

How to autofill custom address in shipping form at checkout page Magento2 : – Here i am going to explain that how to fill custom address in shipping address form at checkout page already when customer redirect this page.

I am assuming that i have already installed magento2 dummy module.Now i will add following file in this module.

1 – We create di.xml file and define plugin in this file.

create – Test/Module/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Checkout\Block\Checkout\LayoutProcessor">
        <plugin name="test_module_default_value" type="Test\Module\Plugin\Checkout\Model\Checkout\LayoutProcessor" sortOrder="100"/>
    </type>
</config>

2- Now Create plugin to add default value.
create – Test/Module/Plugin/Checkout/Model/Checkout/LayoutProcessor.php

<?php
namespace Test\Module\Plugin\Checkout\Model\Checkout;

class LayoutProcessor
{
    /**
    * @param \Magento\Checkout\Block\Checkout\LayoutProcessor $subject
    * @param array $jsLayout
    * @return array
    */
    public function afterProcess(
        \Magento\Checkout\Block\Checkout\LayoutProcessor $subject,
        array  $jsLayout
    ) {
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['firstname']['value'] = 'John';

        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['lastname']['value'] = 'Doe';

        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['company']['value'] = 'Webkul';

        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['city']['value'] = 'New York';


        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['postcode']['value'] = '98001';
        
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
        ['shippingAddress']['children']['shipping-address-fieldset']['children']['telephone']['value'] = '1234567890';


        return $jsLayout;
    }
}