What I built
I added a Cron Expression Builder to devnestio — a free dev tools collection.
👉 https://devnestio.pages.dev/cron-expression-builder/
Visually build cron expressions, get them explained in plain English, and preview the next 10 run times — all in-browser, no API key needed.
Why I built it
Every time I write something like 0 9 * * 1-5, I have to double-check it mentally. This tool makes that instant and visual.
Features
- Visual builder — toggle minutes, hours, day-of-month, month, day-of-week independently
- Plain-English explanation — e.g. "Every weekday at 9:00 AM"
- Next 10 runs preview — calculated from the current time
- Standard 5-field & extended 6-field syntax support
- Common presets — hourly, daily, weekly, monthly, weekdays only
Tech
- Single HTML file, zero dependencies
- Hosted on Cloudflare Pages
- Custom JS cron parser
Part of devnestio — a growing collection of free, in-browser developer tools.
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