simple config to use laravel subdomain route in shared host

.htaccess

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews -Indexes
    </IfModule>

    RewriteEngine On
    # Force to use www just for main domain, not for any subdomain
    RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$ [NC]
    RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L,NE]

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} (.+)/$
    RewriteRule ^ %1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

web.php

<?php
// Laravel route settings in web.php file 

// if we want to use subdomain route we have to keep them all at the top of the main domain routes
Route::domain('admin.example.com')->group(function () {
    Route::get('/', function () {
        return "hello from admin subdomain!";
    });
});

// Use Vue.js as SPA then we have to redirect any request to api but just show index file ;-)
Route::view('/{any}','index')->where('any', '^(?!api).*$');

1. don't forget to add subdomain in the cpanel and remove the subdomain www record from domain zone editor before anyting else
2. the subdomain have to point to the main laravel directory. i.e. public_html