redis - The data created by this code has methods on the prototype chain. How should it be changed?

Question

const redis = require('redis');

const bcrypt = require('bcrypt');

const db = redis.createClient();

function User(obj) {
  for (let key in obj) {
    this[key] = obj[key]
  }
}

User.prototype.save = function (fn) {
  if (this.id) {
    this.update(fn);
  } else {
    let user = this;
    db.incr('user:ids', function (err, id) {
      if (err) {
        return fn(err);
      }
      user.id = id;
      user.hashPassword(function (err) {
        if (err) {
          return fn(err);
        }
        user.update(fn);
      })
    })
  }
};


User.prototype.update = function (fn) {
  let user = this;
  let id = user.id;
  db.set('user:id:' + user.name, id, function (err) {
    if (err) {
      return fn(err);
    }
    db.hmset('user:' + id, user, function (err) {
      fn(err);
    });
  });
};


User.prototype.hashPassword = function (fn) {
  let user = this;
  bcrypt.genSalt(12, function (err, salt) {
    if (err) {
      return fn(err);
    }
    user.salt = salt;
    bcrypt.hash(user.pass, salt, function (err, hash) {
      if (err) {
        return fn(err);
      }
      user.pass = hash;
      fn();
    });
  });
};

Answer 1

JSON.parse(JSON.stringify(data)) can remove the function attributes in the data (don’t underestimate it! It’s fast!).