public function store(Request $request)
{
    $validator = Validator::make($request->all(), ['fullname' => 'required',
        'email'  => 'required|email|max:255|unique:users',
        'username'  => 'required|max:255|unique:users',
        'password'  => 'required',]);
    if ($validator->fails()) {

    return response()->json([
        '1' => 'Your information not stored!',
    ]);
     }
else{
    $newuser = new User;
    $newuser -> fullname = request('fullname');
    $newuser -> email = request('email');
    $newuser -> password = request('password');
    $newuser -> username = request('username');
    $newuser -> status = 1;
    $newuser -> role_id = 1;
    $newuser -> save();
    return response()->json([
        '2' => 'Your information stored successfuly!',
    ]);
    }

https://laravel.com/docs/5.0/hashing
https://laracasts.com/discuss/channels/requests/how-to-hash-user-input-password-when-using-form-validation-in-form-request-laravel-5
 public function setPasswordAttribute($value)
{
    $this->attributes['password'] = bcrypt($value);
}