In Laravel, every existing route URL can be utilized both with and without a trailing slash, and you'll receive a HTTP 200 response in either case. However, for search engine optimization purposes, this is not ideal, as the URLs are considered different and therefore result in duplicated content. To address this, simply create a middleware in Laravel and the issue will be resolved.

Create a middleware

php artisan make:middleware RedirectTrailingSlash

Middleware:

app/Http/Middleware/RedirectTrailingSlash.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class RedirectTrailingSlash
{
    public function handle(Request $request, Closure $next)
    {
        if (preg_match('/.+\/$/', $request->getRequestUri())) {
            $url = rtrim($request->getRequestUri(), '/');
            
            return redirect($url, 301);
        }

        return $next($request);
    }
}

To register the middleware update your app\Http\Kernel.php:

protected $middlewareGroups = [
    'web' => [
        \App\Http\Middleware\RedirectTrailingSlash::class,
        // ...
    ],
],