Query strings shouldn't be defined in your route as the query string isn't part of the URI.
To access the query string you should use the request object. $request->query()
will return an array of all query parameters. You may also use it as such to return a single query param $request->query('key')
class MyController extends Controller
{
public function getAction(\Illuminate\Http\Request $request)
{
dd($request->query());
}
}
You route would then be as such
Route::get('/category/{id}');
Edit for comments:
To generate a URL you may still use the URL generator within Laravel, just supply an array of the query params you wish to be generated with the URL.
url('route', ['query' => 'recent', 'order' => 'desc']);