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Tejas KaleOct 13 · 11 min read

I traced a DNS lookup step by step with dig. Here's what I found

In part 1, I explained what DNS records are. But I left one question open: who actually stores those records, and how does DNS find them out of the whole internet? So I treated a DNS lookup like a gam

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Sahil GuptaOct 9 · 8 min read

JWT Authentication in Node.js Explained Simply

How does a server know who you are on every request? Many beginners think the server remembers them after login. That's not true. HTTP is stateless. Every request arrives like a stranger, with no memo

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Tejas KaleOct 8 · 12 min read

How does a browser know where a website lives?

You type google.com, press Enter, and a moment later the page appears on your screen. But your browser has no idea where that website lives. So how does it find the right computer out of billions? I'm

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Sahil GuptaOct 8 · 8 min read

Sessions vs JWT vs Cookies: How Does a Server Remember You?

How does a server remember that you are logged in? You log in once. Then you open ten more pages, and the app never asks for your password again. Many beginners think the server simply "remembers" the

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Sahil GuptaOct 7 · 6 min read

Where Do Uploaded Files Go? Storing and Serving Them in Express

Where do uploaded files go after Multer saves them? Many beginners think an uploaded file lives inside the request, or inside the database. That's not true. A file is just bytes written to a disk. You

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Sahil GuptaOct 6 · 7 min read

Handling File Uploads in Express with Multer

Why can't Express read a file upload on its own? You build a form with a file input. You submit it. You log req.body. It is empty. Many beginners think Express is broken or that it express.json() shou

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Sahil GuptaOct 5 · 7 min read

REST API Design Made Simple with Express.js

What does "REST API" actually mean? Many beginners think REST is a library or a framework you install. That's not true. REST is a set of rules for how a client and a server talk to each other over HTT

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Sahil GuptaOct 2 · 7 min read

What is Middleware in Express and How Does It Work?

What happens to a request before it reaches your route? You send a request to /api/users. Your route handler sends back a response. Many beginners think the request goes straight from the browser to t

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Sahil GuptaOct 1 · 7 min read

URL Params vs Query Strings in Express.js: Which One Should You Use?

How does Express know which user you want, and how do you filter the results? You open /users/42 and get one user. You open /search?q=laptop&sort=price and get a filtered list. Both look like normal U

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Tushar Kumar JaiswalSep 28 · 3 min read

CSS Selectors 101: Targeting Elements with Precision

Why CSS selectors are needed CSS needs a way to identify which HTML element should receive a particular style. Like we want to change the background color of container or we want to change the text co

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I traced a DNS lookup step by step with dig. Here's what I found

JWT Authentication in Node.js Explained Simply

How does a browser know where a website lives?

Sessions vs JWT vs Cookies: How Does a Server Remember You?

Where Do Uploaded Files Go? Storing and Serving Them in Express

Handling File Uploads in Express with Multer

REST API Design Made Simple with Express.js

What is Middleware in Express and How Does It Work?

URL Params vs Query Strings in Express.js: Which One Should You Use?

CSS Selectors 101: Targeting Elements with Precision