ldc-crm/app/Http/Middleware/Authenticate.php

<?php

namespace App\Http\Middleware;

use Illuminate\Auth\Middleware\Authenticate as Middleware;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Session;

/**
 * Updated for ApiV4.
 */
class Authenticate extends Middleware
{
    /**
     * Get the path the user should be redirected to when they are not authenticated.
     *
     * @param  \Illuminate\Http\Request $request
     * @return string|null
     *
     */
    protected function redirectTo(Request $request): ?string
    {
        if (!$request->expectsJson()) {
            // * Notify must login
            Session::flash('warning', trans('Veuillez vous connecter pour continuer'));

            return route('login');
        }

        return null;
    }
}