Cron Expression Parser Online — Explain Five Cron Fields
Parse a standard five-field cron expression online and label its minute, hour, day, month and weekday fields.
About this tool
This lightweight cron parser verifies that an expression has five whitespace-separated fields and labels each position. It helps inspect structure but does not calculate schedules or fully validate every field value.
How to use
- Paste a five-field cron expression.
- Run the parser to label each field.
- Verify the field syntax against the cron implementation used by your system.
Features
- Labels minute, hour, day-of-month, month and day-of-week fields.
- Accepts whitespace-separated five-field expressions.
- Runs locally in the browser.
Common use cases
- Read an unfamiliar crontab entry.
- Check whether a field was placed in the wrong position.
- Document a scheduled command configuration.
Common issues and tips
- The tool does not support six-field expressions with seconds.
- Cron dialects differ, and this parser does not calculate upcoming run times.
Privacy
Cron parsing runs locally in your browser. The expression is not uploaded to Tools12345.
Frequently asked questions
Does it validate every cron value?
No. It checks the five-field structure and labels positions; consult your scheduler for full syntax validation.
Are seconds supported?
No. The parser expects the traditional five fields beginning with minutes.
Does it show next run times?
No. It explains field placement only.