Free Developer Tools
These started as things we kept opening mid-class — a student's JSON would not parse, or a regex refused to match. Rather than send everyone to a different site every time, we built our own. They are free for anyone to use.
Everything runs in your browser — nothing is uploadedHTML Playground
Write HTML, CSS and JavaScript and watch the output update as you type.
Open toolJSON Formatter
Paste messy JSON, get it formatted and validated. Tells you exactly where it breaks.
Open toolRegex Tester
Write a pattern, see every match highlighted live, with capture groups broken out.
Open toolHTML Formatter
Indent tangled HTML properly, or strip it down for production.
Open toolQR Code Generator
Turn a link, phone number or Wi-Fi login into a QR code and download the PNG.
Open toolBase64 & URL Encoder
Encode or decode Base64 and URL text. Handles Unicode without mangling it.
Open toolCase Converter & Word Counter
Switch text between cases, and count words, characters and reading time live.
Open toolThe tools are free. The thinking behind them is what we teach.
Knowing that a trailing comma breaks JSON is useful. Knowing why the parser cares, and how to design data that does not fall over, is the part that gets you hired. That is what our courses in Amritsar are for.