Developer Resources

An exhaustive checklist of everything a frontend developer should verify before shipping a website.

A plain-language reference for every HTTP status code, from 200 to 599, with quick explanations.

Up-to-date browser support tables for HTML, CSS, and JavaScript features, essential for cross-browser work.

An interactive regex tester with real-time highlighting, explanation, and a library of community patterns.

An enormous index of programming cheatsheets gathered from across the web into one searchable page.

A curated collection of beautiful, printable cheatsheets covering programming languages, tools, and frameworks.

The open-source foundation's guides and checklists for building and securing software against common attacks.

Google's hub for web development guidance, with practical guides, performance audits, and learning paths.

A fast, offline-friendly documentation browser that aggregates API docs for hundreds of languages and tools.

Interactive roadmaps that chart the path to becoming a developer in dozens of specialties and roles.