Q1. How do you insert a document using Node.js driver?
After connecting, get the collection and use insertOne():
const collection = db.collection('users');
const result = await collection.insertOne({
name: 'John',
age: 30
});
console.log(result.insertedId);
await collection.insertMany([doc1, doc2]);
Q2. How do you query documents?
Use find() which returns a cursor:
const cursor = collection.find({ age: { $gt: 25 } });
const users = await cursor.toArray();
const user = await collection.findOne({ name: 'John' });
Q3. How do you update documents?
Use updateOne() or updateMany():
await collection.updateOne(
{ name: 'John' },
{ $set: { age: 31 } }
);
await collection.updateMany(
{ age: { $lt: 18 } },
{ $set: { status: 'minor' } }
);
Q4. How do you delete documents?
Use deleteOne() or deleteMany():
await collection.deleteOne({ name: 'John' });
await collection.deleteMany({ status: 'inactive' });
Q5. How do you handle ObjectId in Node.js?
Import ObjectId from mongodb:
const { ObjectId } = require('mongodb');
const id = new ObjectId("507f1f77bcf86cd799439011");
const user = await collection.findOne({ _id: id });