laravel: Eloquent all() data is missing when converted to json - php

Question

Part of data can not be acquired when Eloquent object is set to Json.
I use command artisan make:Auth, and customized users table.
Specifically, I thought that I did not need to delete the email column once,but since it became necessary, I added it again.
These operations use a migration file.
I got all the data of users table and returned it with Json.
But email is not output.
class UserController extends Controller
{
public function index() {
return User::all();
}
}
Even using json_encode did the same thing.
It exists when use this
$user = User::all();
$userArray = array();
foreach ($user as $u){
$userArray[] = [
'name' => $u->name,
'email' => $u->email
];
}
return $userArray;
Why is not email being outputted?
(I rely on google translation)
Additional notes
Thanks to everyone for comment.
Comparing the output of json with dd(), password and remember_token were not output in addition to email.
Perhaps the email is private property, and private property is a mechanism that does not output JSON?
In that case, how can I change to public?
The User model looks like this
class User extends Authenticatable
{
use Notifiable;
use SoftDeletes;
protected $table = 'users';
protected $dates = ['deleted_at'];
protected $primaryKey = 'uuid';
protected $keyType = 'string';
public $incrementing = false;
protected $fillable = [
'name', 'email', 'password',
];
protected $hidden = [
'password', 'email','remember_token',
];
~~~
}

Answer 1

I solved it myself.
I found that the column set here is not output to JSON.
protected $hidden = [
'password', 'email','remember_token',
];
It was a very simple thing....

Answer 2

try this:
return User::select('name', 'email')->get()->toArray();