CRUD Operations

Create, Read, Update, Delete with the MongoDB driver

MongoDB CRUD

MongoDB is a document database — data is stored as flexible JSON-like documents (BSON) in collections, not rows in tables.

typescript

// CRUD Examples
import { MongoClient } from 'mongodb';

const client = new MongoClient('mongodb://localhost:27017');
const db = client.db('myapp');
const users = db.collection('users');

// CREATE
await users.insertOne({ name: 'Alice', email: 'alice@ex.com', age: 28 });
await users.insertMany([{ name: 'Bob', age: 32 }, { name: 'Carol', age: 25 }]);

// READ
const user = await users.findOne({ email: 'alice@ex.com' });
const adults = await users.find({ age: { $gte: 18 } })
  .sort({ name: 1 }).limit(10).toArray();

// UPDATE
await users.updateOne(
  { email: 'alice@ex.com' },
  { $set: { age: 29 }, $inc: { loginCount: 1 } }
);
await users.updateMany({ status: 'inactive' }, { $set: { archived: true } });

// DELETE
await users.deleteOne({ email: 'alice@ex.com' });
await users.deleteMany({ status: 'inactive' });

// UPSERT
await users.updateOne(
  { email: 'alice@ex.com' },
  { $set: { lastLogin: new Date() } },
  { upsert: true }
);

💬 When to use MongoDB vs SQL?

MongoDB: flexible/evolving schemas, nested data, horizontal scaling, rapid prototyping. SQL: strict data integrity, complex relationships, transactions across tables, reporting. Many apps use both.