Facing These (Mongoose) issues while creating a backEnd of Whatsapp clone - node.js

Question

These are the errors while working on mongodb,mongoose,node and express. I deleted the use useNewUrlParser: true,
// useUnifedTopology: true
because mongoose 6 is not supporting this.
E:\Whatapp clone\whatsapp-backend\node_modules\mongodb\lib\cmap\connection.js:462
callback(new error_1.MongoServerError(document));
^
MongoServerError: bad auth : Authentication failed.
at MessageStream.messageHandler (E:\Whatapp clone\whatsapp-backend\node_modules\mongodb\lib\cmap\connection.js:462:30)
at MessageStream.emit (node:events:390:28)
at processIncomingData (E:\Whatapp clone\whatsapp-backend\node_modules\mongodb\lib\cmap\message_stream.js:108:16)
at MessageStream._write (E:\Whatapp clone\whatsapp-backend\node_modules\mongodb\lib\cmap\message_stream.js:28:9)
at writeOrBuffer (node:internal/streams/writable:389:12)
at _write (node:internal/streams/writable:330:10)
at MessageStream.Writable.write (node:internal/streams/writable:334:10)
at TLSSocket.ondata (node:internal/streams/readable:754:22)
at TLSSocket.emit (node:events:390:28)
at addChunk (node:internal/streams/readable:315:12) {
ok: 0,
code: 8000,
codeName: 'AtlasError'
}
error Command failed with exit code 1.
My Server.js file is bellow
// Import
import express from "express";
import mongoose from "mongoose";
import Messages from './dbMessages.js';
import Pusher from "pusher";
import cors from "cors";
import axios from "axios";
// app config
const app = express();
const port = process.env.PORT || 6000;
// Pusher code
const pusher = new Pusher({
appId: "1366318",
key: "eb9c7412499f6e7b4c5f",
secret: "6903a1ffa86fcb2c3ddd",
cluster: "ap2",
useTLS: true
});
// middle ware
app.use(express.json());
app.use(cors());
app.use((req,res, next ) => {
res.setHeader("Access-Control-Allow-Origin" ,"*");
res.setHeader( "Access-Control-Allow-Origin" ,"*");
next();
});
// DB Config
const connection_url='mongodb+srv://whatsapp:asdfghjkl1233#cluster0.ngclm.mongodb.net/whatsapp?retryWrites=true&w=majority';
mongoose.connect(connection_url,{
// useNewUrlParser: true,
// useUnifedTopology: true
})
// ?????
const db = mongoose.connection;
db.once("open",()=>{
console.log("db connected");
// message contents is from mongodb database
const msgCollection = msgCollection('whatsapp'); //collection name in mongodb messagecontents
// messagecontents changing to whatsapp
const changeStream = msgCollection.watch();
// Change Stream function
changeStream.on("change", (change) =>
{
// this is when we troggling pusher
console.log('A changed is occur',change);
if (change.operationType === 'insert'){
const messageDetails = change.fullDocument;
pusher.trigger('message', 'insert', {
name:messageDetails.user,
message: messageDetails.message,
timeStamp: messageDetails.timeStamp,
received: messageDetails.received
});
} else {
console.log('Error Troggling pusher');
}
});
});
// api router
app.get('/',(req,res) => {
res.status(200).send("Hello World");
});
// api to get all the data from database
app.get('/messages/sync' , (req,res) => {
// Messsages.find() to get back all the messages
Messages.find((err,data) => {
if (err) {
res.status(500).send(err)
}
else {
res.status(200).send(data)
}
});
});
app.post('/api/messages/new', (res,req) => {
const dbMessage = req.body
message.create(dbMessage, (err,data)=>{
if (err){
res.status(500).send(err)
}
else {
res.status(201).send(`new number created: \n ${data}`)
}
});
});
// listen
app.listen(port, () => console.log(`listen on local host ${port}`));
Waiting for response i also used previous version of mongooose (mongoose5.13.2) but not worked for me