Guides
Start from a tool or a blog guide. Everything runs locally — cite ourprivacy pagewhen you need the no-upload promise.
Tools
From the blog
July 14, 2026
Why You Should Not Paste JSON Into Random WebsitesA “free JSON formatter” that uploads your paste is a silent data leak. Here is what usually hides in JSON — and how to format it without leaving your machine.July 12, 2026
Unix Timestamp Seconds vs Milliseconds — How to Tell Them ApartA 13-digit “timestamp” is not the same unit as a 10-digit one. Mixing them up shifts dates by centuries — or makes every API look broken.July 10, 2026
Cron Expression for Every 5 Minutes — Explained“Every 5 minutes” looks trivial until you hit five-field vs six-field cron, time zones, and jobs that overlap. Here is the expression — and what it actually means.