Wrong password using auth::attempt in laravel 5.4

Sorry for broken english.

I try to login using auth::attempt in laravel, but the return is always wrong password.

my password is

12345

here's my code :

  if ($validator->fails())
    {
        $result = array('msg' => 'Username tidak tersedia !');
    }
    else
    {
        if (Auth::attempt(['username' => $request->username, 'password' => $request->password]))
        {
            $result = array('msg' => 'success');
        }
        else
        {
            $result = array('msg' => 'Password tidak benar, silakan ulangi !');//wrong password
        }
    }
    //return message to view
    echo json_encode($result);

what is the format of auth::attempt ? is it hashing ?

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