Web & Developer

Web development runs on a handful of concepts that show up everywhere once you know to look for them — the tokens that keep you logged in, the numbers that store time, the codes a server returns, the patterns that match text.

This cluster explains those building blocks in plain language, so the strings and status codes in your logs and API responses stop being mysterious. Each guide links to a tool that lets you inspect or work with the thing it describes.

Guides in this topic

JWT Explained: Structure, Claims, and How to Decode One

What a JSON Web Token is, the three parts every JWT has, what the common claims mean, how signatures work, and the security pitfalls to avoid.

Working with Unix Timestamps: Epoch Time Made Simple

What a Unix timestamp is, why computers count seconds from 1970, seconds vs. milliseconds, time zones and UTC, and the Year 2038 problem — explained clearly.

Color Formats Explained: HEX, RGB, and HSL

How web colors work — what HEX, RGB, and HSL actually mean, how to convert between them, when to use each, and how alpha transparency fits in.

What HTTP Status Codes Mean (200, 301, 404, 500 and More)

How to read HTTP status codes at a glance, what the five classes mean, and a tour of the codes you'll actually run into — from 200 and 301 to 404 and 500.

Regular Expressions for Beginners: A Gentle Introduction

Learn regex from scratch — what patterns are, the core building blocks (character classes, quantifiers, anchors, groups), and how to read and write your first expressions.