Error: data and salt arguments required


I am trying to save a user to mongodb database using post request as follow, but I got the error bcrypt Error: data and hash arguments required .It’s a pretty simple set up of the code but i can’t figure out anything wrong with it.

const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const confic = require('../models/users');

// User schema
const UserSchema = mongoose.Schema({
	name: {
		type: String,
	email: {
		type: String,
		required: true
		type: String,
		required: true
	password: {
		type: String,
		required: true

const User = module.exports = mongoose.model('User', UserSchema);

module.exports.getUserById = function(id,callback){

module.exports.getUserByUsername = function(username,callback){
	const query = {username:username}

module.exports.addUser= function (newUser, callback) {
   bcrypt.genSalt(10,(err,salt) => {
   	bcrypt.hash(newUser.password, salt , (err, hash) =>{
        if(err) throw (err);



const jwt = require('jsonwebtoken');
User = require('../models/users')

// // Register'/register', (req, res, next) => {
  var newUser = new User({
    username: req.body.username,
    password: req.body.password

  User.addUser(newUser, (err, User) => {
      // res.json({success: false, msg:'Failed to register user'});
    } else {
      // res.json({success: true, msg:'User registered'});



// Authenticate'/authenticate', (req, res, next) => {

// Profile
router.get('/profile', (req, res, next) => {

module.exports = router;

Server was running but after using postman chrome post request error are shown and server stop working as errors shown in image.enter image description here


The error comes from the bcrypt.hash method.
In your case, you have the following piece of code :

bcrypt.hash(newUser.password, salt , (err, hash) => { ... }

I think that your problem comes from the newUser.password that must be empty (null or undefined). The error says data and salt arguments required. It looks like your salt is correctly generated and you didn’t check if newUser.password === undefined, so here’s my bet: somehow newUser.password is undefined.

Also, you can check if the genSalt method works fine by adding if(err) throw (err); after calling it as you did for the bcrypt.hash method.

Answered By – boehm_s

Answer Checked By – Dawn Plyler (AngularFixing Volunteer)

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