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Regex101
Developer ResourcesAn interactive regex tester with real-time highlighting, explanation, and a library of community patterns.
freeweb
BackendCheatsheetFree
The open-source foundation's guides and checklists for building and securing software against common attacks.
OWASP is the standard reference for web application security. Its Top Ten ranks the most critical risks — injection, broken access control, XSS, and more — and its guides explain how each attack works and how to prevent it. The resources are practical and free: threat modeling frameworks, secure coding checklists, and a huge library of testing tools. Every serious security conversation in web development eventually cites OWASP. For developers who want to ship software that doesn't get hacked, this is the playbook, maintained by a global community.
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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