Node.js Modules and npm – Coding in Telugu

Understanding CommonJS Modules

Node.js follows the CommonJS module system, allowing developers to modularize their code for better organization and reusability. Key concepts include:

• Modules: Units of encapsulated code with their own scope.
• require() Function: Used to include modules in other files.
• module.exports Object: Used to expose functionality from a module.

Introduction to npm (Node Package Manager)

npm is a critical tool for Node.js developers, providing a vast ecosystem of libraries and packages. Let’s delve into its core functionalities:

• Package.json: The configuration file that includes metadata about the project and its dependencies.
• Installing Packages: Use the npm install command to install packages locally or globally.
• Semantic Versioning (SemVer): npm follows a versioning scheme to manage package versions efficiently.

Create a file named math.js:

// math.js
const add = (a, b) => a + b;
const subtract = (a, b) => a - b;

module.exports = { add, subtract };

Use the module in another file (app.js):

// app.js
const mathModule = require('./math');

console.log(mathModule.add(5, 3));      // Output: 8
console.log(mathModule.subtract(7, 2)); // Output: 5

Q: What is the CommonJS module system?
A: CommonJS is a module system used by Node.js, allowing developers to create modular and reusable code using the require() function.

Q: How does npm help in managing dependencies?
A: npm provides a package manager for Node.js, allowing developers to easily install, manage, and share packages or libraries.

Q: What is the purpose of the package.json file?
A: package.json contains metadata about the project and its dependencies. It also includes scripts, version information, and other project details.

CommonJS modules in Node.js
Node.js module.exports explained
npm package management tutorial
Installing npm packages locally
Semantic Versioning in npm

Creating and using Node.js modules
npm install vs npm install –global
Understanding package.json in Node.js
Managing dependencies in Node.js
Node.js module.exports best practices

Node.js Modules and npm – Learn Coding in Telugu, Learn Programming in Telugu, Learn Node Js in Telugu, Learn JavaScript in Telugu