Deep dives, security guides, and practical tutorials on the tools developers use every day. Written to save you time.
A practical guide to lookahead and lookbehind assertions — the most powerful regex features with real examples.
Regex can be slow — learn how to avoid catastrophic backtracking, optimize your patterns, and use the right tools for the job.
How to use regular expressions for form validation in JavaScript and HTML — with reusable patterns and common mistakes to avoid.
Production-ready regular expressions for email, URL, phone, password, IP address, and more — with explanations.
Learn regular expressions from scratch — syntax, anchors, character classes, quantifiers, and groups with practical examples.
A concise reference for every Date operation you'll need — parsing, formatting, arithmetic, comparison, and timezone handling.
How to design time-related API fields correctly — format choices, timezone handling, relative times, and avoiding the most painful datetime bugs.
A practical guide to the ISO 8601 date/time standard — formats, timezone notation, durations, and how to use it in your APIs.
Why timezones are hard, how to avoid the most common bugs, and the right patterns for storing, displaying, and comparing dates.
Everything you need to know about Unix timestamps — what they are, how to work with them in any language, and common pitfalls.
Why Base64 offers zero security, common mistakes developers make treating it as obfuscation, and what to use instead.
When to use Base64 vs hexadecimal encoding — a practical comparison with code examples for hashes, binary data, and cryptographic keys.
A complete guide to working with Base64 in JavaScript — browser APIs, Node.js, handling Unicode, and binary data.
Real-world use cases for Base64 in web apps — data URIs, API authentication, file uploads, and inline assets.
A clear explanation of Base64 encoding — what it is, why it exists, and how the encoding algorithm works step by step.
How to implement secure, long-lived sessions with short-lived access tokens and refresh tokens — the pattern used by Google, GitHub, and Stripe.
A step-by-step guide to building JWT authentication in Next.js with App Router, middleware, and secure cookie storage.
An honest comparison of JWT and traditional session-based authentication — tradeoffs, use cases, and which one fits your architecture.
From algorithm confusion to token theft — learn the most dangerous JWT vulnerabilities and the exact patterns to prevent them.
A deep dive into JSON Web Tokens — how they're structured, what claims mean, and why they're the backbone of modern authentication.
A practical comparison of the four most popular data serialization formats — with real-world use cases for each.
Learn how to define, validate, and document your JSON data structures using JSON Schema — the standard for API contracts.
Design better APIs with these JSON conventions: naming, pagination, error formats, and versioning patterns used by top tech companies.
A practical guide to the most frequent JSON parsing errors, what causes them, and exactly how to fix them.
Learn essential techniques to format, validate, and debug JSON data efficiently — a must-have skill for every developer.