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Can I Use
Developer ResourcesUp-to-date browser support tables for HTML, CSS, and JavaScript features, essential for cross-browser work.
freeweb
CSSBrowserFree
An interactive regex tester with real-time highlighting, explanation, and a library of community patterns.
Regex101 makes regular expressions understandable. Paste a pattern and a test string, and it highlights every match in real time, step-by-step. The explanation panel walks through each token in plain English, so you finally understand what a terrifying pattern actually does. It supports multiple flavors — PCRE, JavaScript, Python, Go — and includes a quick reference and a community library of saved expressions. When a regex isn't doing what you expect, Regex101 shows you exactly why. It's the debugging tool every developer who writes regex should keep open.
Up-to-date browser support tables for HTML, CSS, and JavaScript features, essential for cross-browser work.
A browser extension that formats, validates, and syntax-highlights JSON in the browser with collapsible trees.
An API development tool that makes it easy to send requests, inspect responses, and organize the endpoints you work with…
The official API for automating GitHub — repos, issues, PRs, releases, and actions — from your own scripts.
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