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Regex101
Developer ResourcesAn interactive regex tester with real-time highlighting, explanation, and a library of community patterns.
freeweb
BackendCheatsheetFree
A plain-language reference for every HTTP status code, from 200 to 599, with quick explanations.
This site is the definitive plain-English reference for HTTP status codes. Every code — from 200 OK through the 4xx client errors and 5xx server errors — gets a short, clear explanation of what it means and when you'd see it. It's the page you open when a service returns 418 or you can't remember whether 301 or 302 is the right redirect. The organization by category makes it skimmable, and each entry is concise enough to read in seconds. Small, focused, and endlessly useful to anyone who works with the web.
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 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…
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