controller

use Illuminate\Support\Facades\Validator;
$validateUser = Validator::make($request->all(), 
            [
                'name' => 'required',
                'email' => 'required|email|unique:users,email',
                'password' => 'required'
            ]);

            if($validateUser->fails()){
                return response()->json([
                    'status' => false,
                    'message' => 'validation error',
                    'errors' => $validateUser->errors()
                ], 401);
            }