Cheat Sheets

One-page references for the things you keep Googling. Bookmark, print, or share.

Regex Cheat Sheet

Patterns, anchors, quantifiers, and flags in one place.

Every cron field, special character, and a stack of ready-to-paste schedules.

All the status codes you'll actually meet, with one-line meanings.

Every printable ASCII character with its decimal, hex, and use.

Every standard JWT claim with what it means and when to set it.

Every CSS unit, what it's relative to, and when to use it.

The contrast ratios you need to hit for accessible text.