Node.js

CRUD (Create, Read, Update, Delete) are the four basic operations commonly used in data management in web applications. Express.js is a JavaScript framework used to build web applications with Node.js, while MongoDB is a NoSQL database used to store and manage data.

Express.js is a JavaScript framework used to build web applications with Node.js. Multer is a middleware library used to handle file uploads in Express.js applications.

Implementing a communication model where the publisher sends messages to a message broker, and the subscriber receives messages from the message broker. In the pubsub (Publish-Subscribe) model, the publisher does not send messages directly to the subscriber but sends messages to the message broker, which then forwards them to the registered subscribers.