Complete MongoDB Tutorial #17 - Cursors & Fetching Data

Hey gang, in this MongoDB tutorial I'll explain what cursors are and how we use them when fetching data from the database.

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(lesson code available from lesson 15 onwards)

🐱‍💻 Modern JavaScript Course:

[ericcarver]

I really really like these videos. I am in a javascript bootcamp but I find myself using your videos much more intuitive. Thanks Shaun!

[hiradx]

Why did no one ever tell about intentional binding?!
I was just thinking about the times that I was super productive. I was doing it subconsciously. Thank you!

[adityatrived.i]

Your videos are awesome shaun.
I have learnt web development from your tutorials

[Satyam]

If you guys are getting this error: {TypeError: Cannot read properties of undefined (reading 'collection')}, what you can do is try using a return statement in the getDb method in db.js i.e. getDB:()=>{return dbConnection}.

[AhmedKhan-rtoz]

Great, I started learning mongoDB with you and its a great journey till now❤❤❤

[ofeyofey]

Where is the connection string we get on Atlas and where does the username and password for the database go? This a great tutorial. Thanks for sharing.

[artco]

I used getDb: ()=>{dbConnection} and is not working ( TypeError: Cannot read properties of undefined (reading 'collection') issue ), but if i delete the curly brackets: getDb: ()=>dbConnection
, then it works, this is very weird for me since i thought the presence or not of the brackect in the arrow function was indifferente if you use only ONE ITEM inside the function, but seem like it is not so

[flowerofash]

i am curious on how mongodb foreach method works, is it fetch one document each loop or fetch all the documents in one batch and only then it loop through?

[harshithavarma]

whenever im trying to connect to db server not running what shall i do?

[andreilazar]

Hi man. can you do a guide for Mongodb data aggregation?

[cjames]

I'm stuck, I've installed all the correct dependencies and my code is exactly the same as yours, but my database is coming back as undefined even though it's an existing database.

[heshammaher]

solving for this error (MongoServerSelectionError: connect ECONNREFUSED ::1:27017):
update db.js with this code
(This is because the difference in versions of Node JS and MongoDb with the one used in the video.)

const { MongoClient } = require('mongodb');

let dbConnection;

module.exports = {
connectToDb: (cb) => {

// Replace the connection URL with your MongoDB server's URL
const uri =

const client = new MongoClient(uri);

client.connect()
.then(() => {
dbConnection = client.db();
return cb();
})
.catch((err) => {
console.error('Error connecting to MongoDB:', err);
return cb(err);
});
},
getDb: () => dbConnection,
};

[cyprianmitheme]

I love this tutorial and have been following from the first slide and i really appreciate, though after reaching here am getting an error {document cannot be found} anyone to help me please

[russeldomingo]

Hello.. can anyone help me with this error

TypeError: connectToDb is not a function

[jayanspaliwal]

Hey Shawn, please help with this error
MongoServerSelectionError: connect ECONNREFUSED ::1:27017
at Timeout._onTimeout
at listOnTimeout
at process.processTimers (node:internal/timers:507:7) {
reason: TopologyDescription {
type: 'Unknown',
servers: Map(1) { 'localhost:27017' => [ServerDescription] },
stale: false,
compatible: true,
heartbeatFrequencyMS: 10000,
localThresholdMS: 15,
logicalSessionTimeoutMinutes: undefined
},
code: undefined,
[Symbol(errorLabels)]: Set(0) {}
}
, The error is showing even after starting the mongodb service

[varshasharma]

My nodemon is showing module missing error for index.js .... how come you are doing without it

[СергейВиноградов-мъ]

Hi Shaun, following your code and while trying to fetch, i'm getting this error in browser "crbug/1173575, non-JS module files deprecated.", could you pls advise where problem sits, thanks
It only works if i start server manually from terminal and sending request from postman
tried to change to es6 imports, added type: module to package.json and so on but nothing

[madhanagopalselvaganapathi]

Hey shaun, plz help me
localhost:3000/details not showing BSON format
details is my collection name

[riceball]

use mongoose its much easier.😃, if you need help, ask me.

[talhazulfiqar]

please make a playlist on mongodb aggregation in detail there is no good playlist on youtube for mongodb aggregation