Santekno/tools
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Cron Builder

Compose a cron expression from individual fields. Validates and previews the next N runs.

Processed in your browserUpdated · Jan 2026
Input
0 charsshowrunspresets:every-minuteevery-5-minevery-hourdaily-midnight
Output
0 chars

How to use Cron Builder

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

  • Paste or type your input in the INPUT panel
  • The output regenerates automatically as you type
  • Use Copy to put the result in your clipboard
  • Click Sample to load a working example

What is Cron Builder?

Cron Builder takes a JSON object of cron parts — `{minute, hour, dayOfMonth, month, dayOfWeek}` — and emits the 5-field cron expression plus the next N firing times. Missing fields default to `*`. The expression is parsed with `cron-parser` to ensure validity and to compute the firing schedule. Use the Cron Parser tool for the inverse operation: expression → human-readable schedule. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

  • Debugging API payloads and integration issues
  • Inspecting tokens, hashes, or encoded strings during development
  • Generating fixtures and sample data for tests
  • Sharing readable output with teammates in code reviews

FAQ

minute, hour, dayOfMonth, month, dayOfWeek — standard 5-field crontab. Seconds (6-field) and years (7-field) are not yet supported.