Canonical and hreflang: how to implement them properly (and the mistakes that cancel them)
What the canonical tag does, what hreflang does, how to combine them on a multilingual site with x-default, and the mistakes that make Google ignore them.
All articles
Complete list of AIMRAN Blog articles sorted by publication date: web development, artificial intelligence, tools, SEO and technology.
Docker: the difference between an image and a container, explained with commands
What a Docker image is, what a container is and how they relate, with the basic commands to create, list, stop and remove each one, plus the most frequent mistakes.
How to undo the last commit in Git without losing work
How to undo the last commit in Git with reset, revert and amend, which one to use when the commit is already pushed, and how to recover a commit you thought lost.
How a language model works: tokens, context window and temperature
What a token is, what the context window limits, what temperature does and why language models are confidently wrong. Explained for developers, no maths.
How to convert images to WebP (and when not to)
What WebP is, how much it saves over JPEG and PNG, how to convert images in the browser, the terminal or Node.js, and how to serve them with picture.
How to count the tokens in a prompt and estimate what a call to a language model costs
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.
How to read and write a cron expression (with examples you can copy)
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.
How to validate JSON and understand its most common errors
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.
HTTP security headers: which ones to set on any website and what each does
What HSTS, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy do, with recommended values and checks.
Lazy loading images in HTML: loading="lazy", fetchpriority and decoding
How to enable deferred image loading with loading="lazy", why you must not apply it to the main image, and how to combine it with fetchpriority and decoding.
robots.txt versus noindex: what each one does and when to use them
robots.txt controls crawling and noindex controls indexing. What happens when you combine them badly, how to handle internal search and filters, and how to check it.
WCAG colour contrast: how it is calculated, which ratios it requires and how to meet them
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.