laravel get a url using name

// Get the current URL without the query string...
echo url()->current();

// Get the current URL including the query string...
echo url()->full();

// Get the full URL for the previous request...
echo url()->previous();

use Illuminate\Support\Facades\URL;

echo URL::current();

$url = route('routeName');

//if there is a param:
$url = route('routeName', ['id' => 1]);

https://laravel.com/docs/5.1/helpers#method-route