Topic
7 articles · Online tools: practical guides, examples and explanations written by Aimran.
Artificial intelligence
Why models charge per token, how to count tokens exactly for GPT and approximately for Claude, and how to cut the cost of each call without losing quality.
Developer tools
What each of the five fields of a cron expression means, what *, comma, hyphen and slash do, the mistakes that confuse most people and ready-made examples to copy.
Developer tools
JSON syntax rules according to the standard, the five mistakes behind almost every parse failure, and how to validate a file in the browser, terminal or Node.js.
Web development
What the contrast ratio is, how it is calculated from luminance, what levels AA and AAA require, how to measure it and the design mistakes that fail it.
Technology
Anatomy of a JSON Web Token (header, payload and signature), which claims it carries, how to read it, the common security mistakes and where to store it.
Developer tools
Base64 turns binary data into text so it can travel safely. What it is, how much it grows the size, how to encode in JavaScript, Node.js and the terminal.
Web development
The five favicon files needed in 2026 (ICO, SVG, apple-touch-icon and manifest icons), what Google requires to show it in results and which tags go in the head.