MERN — MongoDB Fundamentals

MongoDB Architecture

MongoDB is a popular NoSQL database designed for high performance, high availability, and easy scalability. It stores data in flexible, JSON-like documents, making it easy to work with structured, semi-structured, and unstructured data.

• Database: A container for collections.
• Collection: A group of MongoDB documents.
• Document: A set of key-value pairs (similar to JSON objects).

CRUD Operations

CRUD stands for Create, Read, Update, and Delete. These are the basic operations for interacting with data in MongoDB.

Create

To insert a new document into a collection, you use the insertOne() or insertMany() methods.

insertOne

db.collection('users').insertOne({ name: 'Alice', age: 25 });

Auto-Generated _id Field If you don’t specify an _id field, MongoDB automatically generates a unique identifier for each document. To specify your own _id value, you can include it in the document.

db.collection('users').insertOne({ _id: 1, name: 'Alice', age: 25 });

Make sure to handle duplicate _id values to avoid conflicts.