A function passed as an argument and executed later.

Runs multiple instances to utilize multi-core systems.

Reusable blocks of code, exported and imported using require() or import.

nextTick() executes before setImmediate() in the event loop.

Starts a server and listens on specified port.

Node Package Manager — installs, manages, and shares JavaScript packages.

A minimal and flexible web application framework for Node.js.

A stream handles reading or writing data continuously.

It processes asynchronous callbacks and non-blocking I/O operations efficiently.

Node.js is a JavaScript runtime built on Chrome's V8 engine for server-side scripting.

An object representing the eventual completion or failure of an asynchronous operation.

require is CommonJS; import is ES6 syntax (requires transpilation or newer versions).

Use module.exports or exports.functionName.

Variables stored outside the code for configuration, accessed using process.env.

MongoDB, often used with Mongoose for schema management.

Describes project details and manages dependencies and scripts.

Synchronous blocks execution; asynchronous runs in background without blocking.

Allows or restricts resources shared between different origins.

Use try-catch, error events, or middleware for error handling.

Provides file system-related operations like read, write, delete.

Using event-driven architecture and non-blocking I/O.

Functions in Express that execute during request-response cycle.

A set of routes or endpoints to interact with server logic or databases.

Yes, it's single-threaded but handles concurrency using the event loop and asynchronous callbacks.

Middleware to parse incoming request bodies, like JSON or form data.