Operation buffering timed out after 10000ms even DB is connected - node.js

Question

I can't find what I'm doing wrong. I already dug through a plethora of stacksoverflows but didn't find any solution.
I constantly getting MongooseError: Operation `users.insertOne()` buffering timed out after 10000ms whenever I try to register a user. Some solutions say that I didn't connect to DATABASE. However, I get a confirm that the DB is connected successfully.
Here is the codes.
server.js
const express = require("express");
const mongoose = require("mongoose");
const cors = require("cors");
const app = express();
const PORT = process.env.PORT || 5000;
// Init Middleware
app.use(express.json({ extended: false }));
app.use(cors());
// Bodyparser
app.use(express.urlencoded({ extended: false }));
// Connecting to mongoose
mongoose.connect(
process.env.REACT_APP_MONGO_URI,
{
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
useFindAndModify: false,
},
() => {
console.log("Connected successfully to DB!");
// Listening for actions
app.listen(PORT, () => console.log(`Server started on port ${PORT}`));
}
);
// Defined Routes
app.use("/", require("./routes/index"));
app.use("/users", require("./routes/users"));
users.js
const router = express.Router();
const bcrypt = require("bcryptjs");
const User = require("../models/User");
router.get("/login", (req, res) => {
res.send("Login");
});
router.get("/register", (req, res) => {
res.send("Register");
});
// #route POST /register
// #desc Creates a user
// #access Public
router.post("/register", async (req, res) => {
try {
const { name, surname, email, password, repeatedPassword } = req.body;
if (!name || !surname || !email || !password || !repeatedPassword) {
return res.status(400).json({ msg: "Not all fields were filled." });
}
if (password !== repeatedPassword) {
return res.status(400).json({ msg: "Password doesn't match." });
}
if (password.length < 6) {
return res
.status(400)
.json({ msg: "Password should be at least 6 characters long." });
}
/*
const user = await User.findOne({ email: email });
if (user) {
return res
.status(400)
.json({ msg: "This email is already specified by another user." });
}
*/
const newUser = new User({
name,
surname,
email,
password,
});
newUser.save();
console.log(newUser);
res.json(newUser);
} catch (error) {
res.status(500).send("Server error");
}
});
module.exports = router;
User.js (model)
const Schema = mongoose.Schema;
const UserSchema = new Schema({
name: {
type: String,
required: true,
},
surname: {
type: String,
required: true,
},
email: {
type: String,
required: true,
},
password: {
type: String,
required: true,
},
date: {
type: Date,
default: Date.now,
},
});
module.exports = User = mongoose.model("User", UserSchema);

Answer 1

include user model and create one.
const User = require('./User')
await User.create({ name, surname, email, password, })