First enable the query log as it is disabled by default.
DB::enableQueryLog();
Than at the end of your controller action method, you can use
use Illuminate\Support\Facades\DB; //Reference
//
//Execute queries.
//
print_r(DB::getQueryLog());
and the follow up code.
DB::enableQueryLog();
$users = DB::table('users')->get();
$query = DB::getQueryLog();
print_r($query);
Beside this, we can use toSql method and also use listen method. If you want to view all queries in a request, than use a listen method. Add following code in service provider boot method.
DB::listen(function($query) {
// $query->sql
// $query->bindings
// $query->time
//
echo ($query->sql);
});