Practical, plain-English guides on the topics our tools cover — web security, authentication, networking and accessibility. Every article links to the free browser-based tool you can use to follow along.
A plain-English guide to JSON Web Tokens: how JWTs are structured (header, payload, signature), how signature verification works, common claims like exp and nbf, and when not to use JWTs.
August 20, 2026 · 7 min read
Read article →What every web developer should know about HTTP security response headers: HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and more — with recommended values.
August 28, 2026 · 8 min read
Read article →Learn how CIDR notation works, how prefix lengths map to subnet masks and host counts, what network and broadcast addresses are, and how to subnet for cloud VPCs, Kubernetes and firewalls.
September 1, 2026 · 8 min read
Read article →How WCAG contrast ratios work, the AA and AAA thresholds for text and UI elements, why low contrast excludes users, and a workflow for designing and fixing accessible color pairs.
September 5, 2026 · 7 min read
Read article →