// developer blog

Tutorials & Guides

Practical guides, explanations and tips for developers. Learn about JSON, REST APIs, XPath, regex, JWT, Base64, CSS and more — written by developers, for developers.

JSON

What is JSON? A Complete Guide for Beginners

Learn what JSON is, why it is the most popular data format on the web, how to read and write it, and common mistakes to avoid.

📅 2025 · 8 min readRead →

Security

JWT Tokens Explained: What They Are and How They Work

Understand JSON Web Tokens — the header, payload, signature structure, how authentication works, and when to use JWT vs sessions.

📅 2025 · 10 min readRead →

XML · XPath

XPath 1.0 Complete Guide: Selectors, Axes and Functions

Master XPath expressions to query XML documents. Learn path syntax, axes, predicates, built-in functions and real-world examples.

📅 2025 · 12 min readRead →

REST API

REST API Complete Guide: HTTP Methods, Status Codes and Best Practices

Everything you need to know about building and consuming REST APIs — GET, POST, PUT, DELETE, status codes, headers and authentication.

📅 2025 · 11 min readRead →

Regex

Regular Expressions (Regex) Guide: Patterns, Flags and Examples

Learn regex from scratch — character classes, quantifiers, groups, anchors, lookaheads and practical examples for email, URL and phone validation.

📅 2025 · 9 min readRead →

Encoding

Base64 Encoding Explained: What It Is, How It Works and When to Use It

Understand Base64 encoding and decoding — how the algorithm works, why it exists, data URLs, API tokens and common use cases explained.

📅 2025 · 7 min readRead →