Atlas MongoDB connection

Question

I am trying to connect to Atlas MongoDB with the following URI (provided by mongodb connection string )

    module.exports = {
        mongoURI:'mongodb+srv://<user>:<password>@cluster0-un6sk.mongodb.net/test? 
    retryWrites=true'
    };

    //connect to mongoose
    mongoose
        .connect(db)
        .then( ()=>console.log('mongoDB connected'))
        .catch(err => console.log(err));

I get the following error :

{ MongoNetworkError: connection 3 to cluster0-shard-00-00-un6sk.mongodb.net:27017 closed
    at TLSSocket.<anonymous> (C:\Users\KARTIT Ismail\Desktop\devconnector\node_modules\mongodb-core\lib\connection\connection.js:352:9)
    at Object.onceWrapper (events.js:273:13)
    at TLSSocket.emit (events.js:182:13)
    at _handle.close (net.js:606:12)
    at TCP.done (_tls_wrap.js:386:7)
  name: 'MongoNetworkError',
  errorLabels: [ 'TransientTransactionError' ],
  [Symbol(mongoErrorContextSymbol)]: {} }

Answer 1

Make sure you have whitelisted your IP in the Atlas Control panel.

You can enter 0.0.0.0, if you wish to allow access from any host.

Then you can have a connection string like below:

var connectionString= 'mongodb://<username>:<password>@<clustername>/<dbname>?ssl=true&replicaSet=<replica setname>&authSource=admin';

var db = mongoose.connect(connectionString).catch((error) => { console.log(error); });

Answer 2

Whitelist the IP address, the best option allows access from any host, I believe everyone had installed mongoose, if not then use this command

npm i mongoose

First copy your application connection string from mongodb.com -> clusters->connect->connect your application

Now chose driver Node.js and version latest, now copy connection string.

Now connection.js

const mongoose = require('mongoose');
const conStr = 'mongodb+srv://lord:<password>@cluster5-eeev8.mongodb.net/test?retryWrites=true&w=majority'

const DB = conStr.replace(
  '<password>',
  myPass
);

const DB = conStr.replace(
  'test',
  myDatabaseName
);
//remember mongoose.connect() return promise
mongoose
  .connect(DB, {
    usedNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
  })
  .then((con) => {
    console.log(con.connection);
    console.log('DB connection successful');
  });