Practical articles on JSON, CSS, Base64, SEO, structured data and more. Each guide pairs real code examples with free tools so you can go from reading to shipping in minutes.
Date formatting confusion is surprisingly common. Learn the most widely used date formats — ISO 8601, RFC 2822, US-style MM/DD/YYYY — what each means, when to use them, and how to convert between them without bugs.
"Ships in 3 business days" — when does it actually arrive? Learn what business days mean, how to count them correctly, why holidays complicate things, and how to calculate them automatically.
Need to know how many days until a deadline, birthday, or event? Learn how to calculate remaining days manually, with spreadsheet formulas, and using browser tools — plus tips for deadline management.
Amida Kuji (ladder lottery) is a fair drawing method used across Japan. Learn how the vertical and horizontal lines determine outcomes, why it produces unbiased results, and how to create one digitally.
An online roulette wheel is a fast, fair way to make decisions. Learn how to set it up for task assignments, turn orders, lunch picks, and classroom activities — and why random selection removes friction.
Paper lotteries are slow and easy to rig. Learn how to run fair online drawings using ladder lottery, roulette wheels, and random number tools — with practical examples for teams, classrooms, and giveaways.
A clear, practical introduction to JSON. Learn the syntax, data types, real-world use cases in REST APIs and config files, and common pitfalls like missing commas and unsupported comments.
A practical breakdown of JWT structure — header, payload, signature. Covers the full auth flow, how signature verification works, where to store tokens, and JWT vs session cookies.
Learn what a UUID is and when to use each version. Covers v1 (time-based), v4 (random), and v7 (sortable), with practical guidance on database primary keys vs auto-increment IDs.