Node.JS : Async/Await taking so long and never ending - node.js

Question

I'm trying to set up an API with MongoDB (Mongoose) with a JWT authentication. I am at the first step where I create an user in the DB.
But I encounter a problem : the async/await taking so long and never ending, while the user is not created on DB. I don't know why.
I'm testing with POSTMAN for requests. For information, when I'm starting my app, I'm getting the "connected to db !" who appear correctly.
Can someone help me please ?
app.js
'use strict';
const express = require("express"),
app = express(),
authRoutes = require('./routes/auth'),
externalRoutes = require('./routes/web'),
database = require('./database/db'),
bodyParser = require("body-parser"),
mongoose = require('mongoose')
;
require('dotenv').config();
var options = { useNewUrlParser: true, useUnifiedTopology: true };
mongoose.connect("mongodb+srv://user:password#host.mongodb.net/test?retryWrites=true&w=majority", options, () => console.log('connect to db !'));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use('/api/user', authRoutes);
app.use('/', externalRoutes);
app.listen(8080);
auth.js
const router = require('express').Router();
const User = require('../database/schemas/User');
router.post('/register', async (req, res) => {
const user = new User({
name: req.body.name,
email: req.body.email,
password: req.body.password,
});
const savedUser = await user.save((error, userDoc) => {
if (error) return res.status(400).send(error);
});
res.send({
user: savedUser._id
});
}).post('/login', (req, res) => {
});
module.exports = router;
User.js
const mongoose = require('mongoose');
const userSchema = new mongoose.Schema({
name: {
type: String,
required: true,
min: 6,
max: 255
},
email: {
type: String,
required: true,
max: 255,
min: 10
},
password: {
type: String,
required: true,
max: 1024
},
createdAt: {
type: Date,
default: Date.now()
},
updatedAt: {
type: Date,
default: Date.now()
},
});
module.exports = mongoose.model('User', userSchema);

Answer 1

In Auth.js do this instead
const router = require('express').Router();
const User = require('../database/schemas/User');
router.post('/register', async (req, res) => {
const user = new User({
name: req.body.name,
email: req.body.email,
password: req.body.password,
});
try {
// if you are using await, don't pass it a callback
const savedUser = await user.save();
return res.send({
user: savedUser._id
});
} catch (error) {
// use try/catch to handle error instead of error first parameter in callback
return res.status(400).send(error);
}
}).post('/login', (req, res) => {
});
module.exports = router;
Here is a link to the documentation that shows you how to correctly use the save method. https://mongoosejs.com/docs/api.html#model_Model-save