Blog category
Practical guides for developers — JSON, JWT, cron, regex, hashing, UUIDs, and the rest of the bookmark-worthy utilities.
Developer
- uuidjavascriptpython
Generating UUIDs across languages: stdlib vs libraries in 2026
v4 and v7 in JavaScript, Python, Go, Rust and PHP — which ships in the standard library, which needs a package, and the one-liner that works today.
1 min readRead - regexperformancesecurity
Why your regex is slow: catastrophic backtracking explained
The reason `(a+)+b` hangs on `aaaaaaaaac` — and the five patterns that turn a 10ms validator into a 30-second ReDoS attack.
2 min readRead - timezonesdatetimedst
Timezone conversion: the edge cases that bite
DST, half-hour offsets, timezones with historical changes, and the midnight that doesn't exist. If your code assumes 24 hours a day, it's wrong.
6 min readRead - uuididsdatabase
UUID v4 vs v7: which should you use in 2026?
v4 is random. v7 is time-sortable. Here's what that means for your database, your caches, and whether you can stop using auto-increment IDs.
5 min readRead - cronschedulingunix
Cron syntax explained: a no-nonsense guide
Cron is five fields in a line of text. This is what each one means, what the specials do, and why `0 0 * * 0` runs weekly.
6 min readRead - authjwtsecurity
What is a JWT? A practical guide for developers in 2026
JSON Web Tokens explained simply: what they are, how they work, when to use them — and how to inspect one safely.
6 min readRead