Step-by-step guides for developers and link tools: how referrers work, Referrer-Policy, JSON, regular expressions, UUIDs, timestamps and number systems.
The tutorials are practical, step-by-step guides for developers and anyone who works with links and data. Several explain how link anonymization works under the hood, from the Referer header to referrer policies. The rest cover everyday developer formats and tools, such as JSON, regular expressions, UUIDs, Unix timestamps and number systems.
Every tutorial links to the tool it describes, so you can try it as you read. For security and SEO topics, see the Security and Webmaster sections.
How Markdown becomes HTML, CommonMark versus GitHub Flavored Markdown, how to keep the output safe, and how to convert Markdown in code.
JAY
Merge PDF files in four steps, plus what to check first, what can change in a merged file, free offline methods and fixes for common problems.
JAY
Regular expressions are powerful but hard to remember. Here is the essential regex cheat sheet plus how to test and debug any regex pattern online.
JAY
Cloudflare hides a website's real server IP behind its proxy. Here is how Cloudflare IP resolution works and why the real IP sometimes leaks.
JAY
Minified JSON is unreadable. Invalid JSON breaks your API calls. Here is how to format, validate and fix JSON errors instantly — with examples.
JAY
Affiliate link cloaking turns ugly tracking URLs into clean branded links. Here is what it is, why it matters for conversions, and how to do it properly.
JAY
Standard URL shorteners still pass your referrer header. Here is how to create short anonymous links that hide where you came from.
JAY
QR codes turn any URL into a scannable image. Here is how to generate a QR code for your link, website, WiFi password, or contact details in seconds.
JAY
Complete guide to wa.me links — URL format, phone number formatting by country, pre-filled messages, URL encoding, QR codes, and tracking performance.
JAY