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Regex101
Developer ResourcesAn interactive regex tester with real-time highlighting, explanation, and a library of community patterns.
freeweb
BackendCheatsheetFree
An exhaustive checklist of everything a frontend developer should verify before shipping a website.
The Frontend Checklist is the pre-flight checklist for websites. It walks through everything worth checking before launch — HTML semantics, CSS performance, JavaScript best practices, accessibility, SEO, performance budgets, and security headers — as a list of concrete, testable items. Each item links to the resources that explain it, so the checklist doubles as a curriculum. Teams use it as a review template, and developers use it to catch the things that are easy to forget. If you want to ship quality, this is the bar.
An interactive regex tester with real-time highlighting, explanation, and a library of community patterns.
Up-to-date browser support tables for HTML, CSS, and JavaScript features, essential for cross-browser work.
A free collection of open-source fonts you can use on your website with a single line of code, or download and use anywh…
A community where you solve kata — ranked coding challenges — and learn from thousands of other solutions.
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