Harsh Raj

@RajHarsh03

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Web Developer, Building useful web applications

Kolkata, West BengalJoined January 2026

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CS undergrad | Tech enthusiast | Focusing on Web Dev • DSA • ML | Building skills for real-world impact

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Harsh Raj's blogs

Decode with Harshblog.harshx.in53 posts

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Recently published

HRHarsh Rajblog.harshx.inJun 3 · 8 min read

Linux File System Hunting: 10 Discoveries That Changed How I See Linux

I spent a few hours this week not running commands, but actually reading what Linux keeps lying around on disk. What I found was more interesting than I expected. Not because the files are complex, bu

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HRHarsh Rajblog.harshx.inMay 4 · 13 min read

Understanding the this Keyword in JavaScript

this = most confusing JavaScript concept. What this refer to? Depend on who call function. Caller = this. Understand caller, understand this. This about this keyword and how it change. What this Repr

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HRHarsh Rajblog.harshx.inMay 4 · 17 min read

The Node.js Event Loop

Node.js run single thread. But handle thousands requests. How? Event loop. Event loop = manager that decide what code run when. Without it, Node.js freeze on first slow task. This about understanding

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HRHarsh Rajblog.harshx.inMay 4 · 13 min read

Blocking vs Non-Blocking Code in Node.js

Node.js runs on single thread. Blocking code freezes whole server. Non-blocking code keep server alive. Difference = slow API vs fast API. This about blocking, non-blocking, and async patterns in Node

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HRHarsh Rajblog.harshx.inMay 4 · 13 min read

REST API Design Made Simple with Express.js

REST API is a standard way for the client to communicate with the server. Instead of mysterious endpoints like /getUser or /fetchUserData, REST uses predictable HTTP methods and resource-based URLs. O

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Harsh Raj

About

Available for

Harsh Raj's blogs

Recently published

Linux File System Hunting: 10 Discoveries That Changed How I See Linux

Understanding the this Keyword in JavaScript

The Node.js Event Loop

Blocking vs Non-Blocking Code in Node.js

REST API Design Made Simple with Express.js

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Harsh Raj

About

Available for

Harsh Raj's blogs

Recently published

Linux File System Hunting: 10 Discoveries That Changed How I See Linux

Understanding the this Keyword in JavaScript

The Node.js Event Loop

Blocking vs Non-Blocking Code in Node.js

REST API Design Made Simple with Express.js