Node.js Overview
1. Introduction to Node.js
What is Node.js: Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine, designed
for building fast and scalable network applications.
History of Node.js: Node.js was created by Ryan Dahl in 2009, revolutionizing server-side
development by enabling JavaScript to be used outside the browser.
Key Features: Node.js is known for its non-blocking, event-driven architecture, making it efficient for
building real-time applications like chat servers and APIs.
2. Asynchronous Programming in Node.js
Event-Driven Architecture: Node.js uses an event-driven, non-blocking I/O model that allows for
handling many connections simultaneously.
Callbacks: Callbacks are functions passed as arguments to other functions, executed once the
asynchronous operation completes.
Promises and Async/Await: Node.js supports modern asynchronous patterns using Promises and
async/await, providing more readable and maintainable code.
3. Modules in Node.js
CommonJS Modules: Node.js uses the CommonJS module system, where each file is treated as a
module. Modules are imported using require() and exported using module.exports.
Built-in Modules: Node.js provides built-in modules like http, fs (file system), path, and events,
offering functionality for network, file, and system operations.
Creating Custom Modules: Developers can create custom modules in Node.js by organizing code
into separate files and exporting them as reusable components.
4. HTTP Server in Node.js
Creating an HTTP Server: The http module in Node.js allows for creating an HTTP server using the
createServer() function.
Handling Requests and Responses: Node.js processes incoming HTTP requests and sends
1. Introduction to Node.js
What is Node.js: Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine, designed
for building fast and scalable network applications.
History of Node.js: Node.js was created by Ryan Dahl in 2009, revolutionizing server-side
development by enabling JavaScript to be used outside the browser.
Key Features: Node.js is known for its non-blocking, event-driven architecture, making it efficient for
building real-time applications like chat servers and APIs.
2. Asynchronous Programming in Node.js
Event-Driven Architecture: Node.js uses an event-driven, non-blocking I/O model that allows for
handling many connections simultaneously.
Callbacks: Callbacks are functions passed as arguments to other functions, executed once the
asynchronous operation completes.
Promises and Async/Await: Node.js supports modern asynchronous patterns using Promises and
async/await, providing more readable and maintainable code.
3. Modules in Node.js
CommonJS Modules: Node.js uses the CommonJS module system, where each file is treated as a
module. Modules are imported using require() and exported using module.exports.
Built-in Modules: Node.js provides built-in modules like http, fs (file system), path, and events,
offering functionality for network, file, and system operations.
Creating Custom Modules: Developers can create custom modules in Node.js by organizing code
into separate files and exporting them as reusable components.
4. HTTP Server in Node.js
Creating an HTTP Server: The http module in Node.js allows for creating an HTTP server using the
createServer() function.
Handling Requests and Responses: Node.js processes incoming HTTP requests and sends
