handling the error CSRF token mismatch in Laravel.

verifyCsrfToken.php

<?php

namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;
use Closure;
use Illuminate\Support\Facades\Auth;


class VerifyCsrfToken extends Middleware
{
    /**
     * Indicates whether the XSRF-TOKEN cookie should be set on the response.
     *
     * @var bool
     */
    protected $addHttpCookie = true;

    /**
     * The URIs that should be excluded from CSRF verification.
     *
     * @var array
     */
    protected $except = [
        //
    ];

    public function handle($request, Closure $next)
    {
        if ($request->route()->getActionMethod() == 'login') {
            $this->except[] = route('brackets/admin-auth::admin/login');
        }

        if ($request->route()->named('brackets/admin-auth::admin/logout')) {
            //Deletando o coockie
            unset($_COOKIE['XSRF-TOKEN']);
            unset($_COOKIE['myapp_session']);
            setcookie("XSRF-TOKEN", "", time() - 3600,"/");
            setcookie("myapp_session", "", time() - 3600,"/");

            if (!Auth::check() || Auth::guard()->viaRemember()) {
                $this->except[] = route('brackets/admin-auth::admin/logout');
            }
        }
        return parent::handle($request, $next);
    }
}

After many unsuccessful attempts, I decided to go deeper and solve the problem at the root.

app/Http/Middleware/VerifyCsrfToken.php