How to fetch data from MongoDB using Node JS and Express JS

[@architverma862]

hey dude, Just I let u know u doing great job with these videos. Keep going

[@StudyAutomationAcademy]

Thanks

[@Rovijun21]

Thank you so much! that's all I need to understand! keep it up man 😉

[@ankitasaanvilife]

Very informative thank you sir

[@prashantkashyap171]

You saved my day.Great...

[@StudyAutomationAcademy]

Glad I could help

[@riturajkarna3163]

Well explained 👍

[@nityaranjan6714]

Awsome!!

[@luischauca5866]

Now how could I use that data in a html file with script trying to fetch the data to make a graph.

[@nicholaskacprowicz5148]

Very good tutorial, unfortunately it cut a little short for my issue. I want to take the data from the database and make variables out of the data client side - is this possible?

[@StudyAutomationAcademy]

Yes, you can use Object.entry(data).vlaues

[@nicholaskacprowicz5148]

@@StudyAutomationAcademy thank you!

[@irkfaisal]

If I want to get the data of individual user by I'd ? How can I do this

[@RajuRaju-sc5ku]

It is different from mongoose ?

[@ajaykate4675]

what about the count query please help with it..!

[@Rooban-v6f]

i have 15000 data when i try to fetch data using find it shows Error: Maximum response size reached
help me to solve this issue

[@StudyAutomationAcademy]

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb://localhost:27017";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });
async function fetchDataInBatches(collectionName, limit = 1000) {
try {
await client.connect();
const database = client.db("yourDatabaseName");
const collection = database.collection(collectionName);
let cursor = collection.find({});
let data = [];
while (await cursor.hasNext()) {
const batch = await cursor.limit(limit).toArray();
data.push(...batch);
}
return data;
} catch (error) {
console.error(error);
} finally {
await client.close();
}
}
fetchDataInBatches("yourCollectionName")
.then(data => {
// Process the data in batches here
})
.catch(error => {
console.error(error);
});

[@StudyAutomationAcademy]

You can use cursor based query

[@Rooban-v6f]

​@@StudyAutomationAcademy i want without using pagination

[@Rooban-v6f]

@@StudyAutomationAcademy i want without using pagination

[@StudyAutomationAcademy]

The above code is without pagination only.. if you see we have usee while loop.. it will fetch all records in batch and return all records

[@Xemtaren]

slash or shlas?

[@StudyAutomationAcademy]

Good catch

[@abbasalisheru9948]

"Cannot read properties of undefined (reading 'collection')" this error throw

[@befikra522]

am also facing this issue

[@aaronfernandes4688]

Where is that database variable defined ?