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 15, 2026
Pretty-Print JSON Without Uploading SecretsPretty-printing is harmless until your JSON includes secrets. Keep formatting on your device.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.