Nodejs unable to connect with MongoDB - node.js

Question

I am creating a basic application to connect my Nodejs code to MongoDB but the code is not getting executed. Have attached image for the output I am getting. It is not printing to console
got db connection
Have checked that the MongoDB is up and running and I am able to execute normal MongoDB operations using Mongo Client and Compass using mongodb://127.0.0.1:27017. Is there any missing configuration or any changes that need to be done on the code side.
MongoDB version 5.0
NodeJS version 18.13.0
npm version 8.19.3
var MongoC = require('mongodb').MongoClient;
var url = "mongodb://127.0.0.1:27017";
console.log('waiting db connection')
MongoC.connect(url, function (err, db) {
//control not reaching here-- Expected to log to console 'got db connection'
console.log('got db connection');
if (err) {
throw err;
}
console.log('hello');
});
Output:

Answer 1

Try adding the await keyword at the start of line #4. MongoClient.connect is an async function.
Example from documentation:
const { MongoClient } = require("mongodb");
// Connection URI
const uri =
"mongodb+srv://sample-hostname:27017/?maxPoolSize=20&w=majority";
// Create a new MongoClient
const client = new MongoClient(uri);
async function run() {
try {
// Connect the client to the server (optional starting in v4.7)
await client.connect();
// Establish and verify connection
await client.db("admin").command({ ping: 1 });
console.log("Connected successfully to server");
} finally {
// Ensures that the client will close when you finish/error
await client.close();
}
}
run().catch(console.dir);
https://www.mongodb.com/docs/drivers/node/current/fundamentals/connection/connect/#std-label-node-connect-to-mongodb

Answer 2

Mongodb standard uri is:
mongodb://MONGODB_USERNAME:MONGODB_PASSWORD#MONGODB_HOST:MONGODB_PORT
Did you save the file before running it? :))))
Use this:
async function main(){
/**
* Connection URI. Update <username>, <password>, and <your-cluster-url> to reflect your cluster.
* See https://docs.mongodb.com/ecosystem/drivers/node/ for more details
*/
const uri = "mongodb+srv://<username>:<password>#<your-cluster-url>/test?retryWrites=true&w=majority";
const client = new MongoClient(uri);
try {
// Connect to the MongoDB cluster
await client.connect();
// Make the appropriate DB calls
await listDatabases(client);
} catch (e) {
console.error(e);
} finally {
await client.close();
}
}
main().catch(console.error);