design a middleware for a minimalistic application

auth.js

const jwt = require("jsonwebtoken")
const User = require("../models/user")

const auth = async (req, res, next) => {
  try {
    const token = req.header("Authorization").replace("Bearer", "")
    const decoded = jwt.verify(token, "thegivensecret")
    const user = await User.findOne({
      _id: decoded._id,
      "tokens.token": token
    })
    
    if (!user) {
      throw new Error();
    }
    
    req.token = token;
    req.user = user;
    next();
  } catch (e) {
    res.status(401).send({"Please authenticate"});
  }
}