public function createUser(Request $request)
{
    $data=$request->only('email','name','position');
    $validate=Validator::make($data, [
        'email' => 'required|email|unique:users',
        'name' => 'required',
        'position' => 'required',
    ]);

    $exUser=User::where('email','=',$request['email'])->first();
    $nameUser=User::where('name','=',$request['name'])->first();

    if(empty($exUser))
    {
        if(empty($nameUser))
        {
            $user=new User();
            $user->name=$request['name'];
            $user->email=$request['email'];
            $user->position=$request['position'];
            $user->password=hash('sha512',$request['password']);
            $user->save();
        }
        else
        {
            return response()->json(['Name Has Already Taken'],500);
        }

    }
    else
    {
        return response()->json(['Email Has Already Taken'],500);
    }
}

protected function create(array $data)
{
    return User::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'position' => $data['position'],
        'password' => bcrypt($data['password'])
    ]);
}

<?php

use AppUser;
use IlluminateHttpRequest;

     Route::get('users',['as' => 'user', 'uses'
     =>'AuthLoginController@getUsers']);

    Route::post('users', ['as' => 'createUser', 'uses' =>
    'LoginController@createUser']);