2. What are the main modules of Node.js? Explain in detail.

Question

Accepted Answer

The main modules of Node.js are HTTP, File System, Path, and Events.

HTTP module allows Node.js to transfer data over the HyperText Transfer Protocol (HTTP).
File System module enables interaction with the file system, allowing reading, writing, and manipulating files.
Path module provides utilities for working with file and directory paths.
Events module allows for event-driven programming, enabling the creation and handling of custom events.

Accepted Answer

Node.js has a rich set of built-in modules that provide a range of functionalities for building server-side applications. Here are some of the main modules of Node.js:

fs module: The fs module provides a set of APIs for interacting with the file system. It allows developers to read and write files, create and delete directories, and perform other file system operations.
http module: The http module provides a set of APIs for building web servers and making HTTP requests. It allows developers to create HTTP servers, handle requests, and send responses.
crypto module: The crypto module provides a set of APIs for performing cryptographic operations, such as creating hashes, encrypting and decrypting data, and generating random numbers.
net module: The net module provides a set of APIs for building TCP and UNIX socket servers and clients. It allows developers to create network servers and clients, and perform socket operations.
events module: The events module provides a set of APIs for building event-driven applications. It allows developers to create and emit custom events, and handle events using event listeners.
path module: The path module provides a set of APIs for working with file paths. It allows developers to join, normalize, and resolve file paths, and perform other path-related operations.
child_process module: The child_process module provides a set of APIs for spawning child processes. It allows developers to execute shell commands, run scripts, and perform other system-level operations.

Accepted Answer

Node.js is an open-source, cross-platform JavaScript runtime environment that allows developers to run JavaScript code on the server-side. Node.js was initially built on top of Google's V8 JavaScript engine, which compiles JavaScript code to native machine code, making it very fast.

The inner workings of Node.js can be broken down into the following components:

V8 Engine: Node.js is built on top of Google's V8 JavaScript engine, which compiles JavaScript code to native machine code for optimal performance.
Event Loop: Node.js uses an event-driven, non-blocking I/O model that allows multiple tasks to be performed concurrently. The event loop is responsible for handling I/O operations, timers, and callbacks.
Node.js API: Node.js provides a rich set of built-in modules and libraries that can be used to interact with the file system, network, and other system resources. Some of the core modules include the http module for building web servers, the fs module for file system operations, and the crypto module for cryptographic functions.
Modules: Node.js allows developers to create modular applications using the CommonJS module system. This allows developers to write reusable code and organize their code into smaller, more manageable files.
NPM: Node Package Manager (NPM) is a package manager for Node.js that allows developers to easily install, manage, and share third-party packages and libraries. NPM has a vast collection of open-source packages that can be used to enhance the functionality of Node.js applications.

2. What are the main modules of Node.js? Explain in detail.

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