Error: data and salt arguments required (Async) - node.js

Question

I have a problem with Schema.pre('save'), in my model 'user', cannot get 'this' for the hashed of my password with bcrypt.
my app.js, Simple connect in mongodb using mongoose
mongoose.connect('mongodb://localhost/gederson', {
useMongoClient: true,
});
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
console.log('Connected on mongo');
});
app.listen(process.env.PORT || 3000, () => {
console.log('listening');
});
index(app, db);
post(app, db);
admin(app, db);
module.exports = app;
my route, I created the route for create user in my application, but in pre 'save' cannot get the 'this' for hash password.
const Users = db.model('Users');
const newUser = {
username: req.body.username,
email: req.body.email,
password: req.body.password,
};
Users.create(newUser, (err) => {
if (err) throw err;
res.status = 201;
return res.send('User created');
});
my model user, the code pre 'save'
const bcrypt = require('bcrypt');
UserSchema.pre('save', (next) => {
const user = this;
bcrypt.hash(user.password, 10, (err, hash) => {
if (err) {
return next(err);
}
user.password = hash;
return next();
});
});
const Users = mongoose.model('Users', UserSchema);
module.exports = Users;
Stack Error:
events.js:183
throw er; // Unhandled 'error' event
^
Error: data and salt arguments required
at /home/gedersonchiquesi/ProjetosDev/wos/node_modules/bcrypt/bcrypt.js:114:16
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
[nodemon] app crashed - waiting for file changes before starting...

Answer 1

I ran into a similar issue today.
I resolved the matter by removing the ES6 syntax (arrow function).
UserSchema.pre('save', function(next) {
const user = this;
bcrypt.hash(user.password, 10, function(err, hash) {
if (err) {
return next(err);
}
user.password = hash;
next();
})
});

Answer 2

because you are passing the blank value of the inputs on that function
if test on postman or else data input needed
{
"name":"test",
"email":"test#test.com",
"password":"123456"
}
add see my code example for datastore
router.post("/register-user", (req, res, next) => {
bcrypt.hash(req.body.password, 10).then((hash) => {
const user = new userSchema({
name: req.body.name,
email: req.body.email,
password: hash
});
user.save().then((response) => {
res.status(201).json({
message: "User successfully created!",
result: response
});
}).catch(error => {
res.status(500).json({
error: error
});
});
});
});

Answer 3

My issue was my server wasn't accepting the correct data type.
Had to include the following on server.js file:
app.use(express.json()); &
app.use(express.urlencoded({extended: true}));