Modules

OS Module:

The os module in Node.js provides various utility methods related to the operating system. Let's look at your code and explain each part:

Explanation:

• os.userInfo(): Returns information about the current user, such as username, uid, gid, shell, and homedir.
• os.uptime(): Returns the system uptime in seconds.
• os.type(): Returns the operating system name.
• os.release(): Returns the operating system release.
• os.totalmem(): Returns total system memory.
• os.freemem(): Returns free system memory.

Example: Let's say you're building a system information dashboard. You can use the os module to display the current user's information, system uptime, OS type, release version, total memory, and free memory. This helps users monitor their system resources and performance.

HTTP Module:

The http module in Node.js allows you to create HTTP servers and handle HTTP requests. Here's your example:

Explanation:

• http.createServer(): Creates an HTTP server instance.
• The server responds differently based on the requested URL:If the URL is /, it responds with "Welcome to our home page".If the URL is /about, it responds with "Here is our short history".For any other URL, it responds with a generic "Oops!" message and a link back to the home page.

Example: Let's say you're developing a basic website. You can use the http module to create a server that serves different content based on the requested URL. This code snippet demonstrates how you can handle basic routing for a small website, serving different pages for the home and about sections.

These examples showcase the basic functionality of these commonly used Node.js modules. For a comprehensive application, you might combine these modules to build features such as user authentication, file management, or API endpoints. Node.js offers a vast array of modules catering to different needs, from database connectivity (mongodb, mysql) to web frameworks (express, koa). Understanding and effectively using these modules can greatly enhance your Node.js development skills!

Disclaimer: "Please note that this overview covers only a fraction of the available modules and methods in Node.js. The Node.js ecosystem offers a wide range of modules catering to various needs, and exploring further can uncover even more powerful features for your applications."

Also "fs" module has already been covered in last article do check that out as well !