Cron Parser
Parse a cron expression and show the next scheduled run times. Validates syntax and lists field values.
About Cron Parser
Cron Parser takes a cron expression, validates its syntax, breaks down each field, and shows you the upcoming run times so you know exactly when a job will fire. It's the sanity check you run before committing a crontab line or a scheduled-task config. The parsing happens in your browser, so your schedule never goes to a server.
- Category
- dev
- Input
- Accepts: text/plain.
- Output
- Outputs: application/json.
- Cost
- Free, runs in your browser
- Memory
- low
Common uses
- Confirm that 0 2 * * 1 really means 2 AM every Monday before adding it to your deploy crontab
- See the next five fire times for a backup job to catch an off-by-one in the day-of-week field
- Decode an inherited cron line in a legacy config you're not sure still runs when you think
- Verify a CI scheduler expression matches the maintenance window you intended
- Check whether a */15 expression actually runs every 15 minutes or trips on a field boundary
- Document what a Kubernetes CronJob schedule resolves to before handing it off to a teammate
Frequently asked questions
What does the output include?
It returns the next scheduled run times along with a per-field breakdown (minute, hour, day-of-month, month, day-of-week) and flags invalid syntax. The result is structured JSON.
Does it validate the expression?
Yes. It checks the syntax and reports an error if a field is out of range or malformed, rather than silently producing wrong run times.
Is my cron expression sent anywhere?
No. Parsing runs entirely in your browser, so the schedule stays on your machine.
What if I don't know the cron syntax and want to describe the schedule in words?
This tool reads an existing expression. To generate one from a plain-English description, use Cron From Text instead, then paste the result here to verify the run times.
Does it support special strings like @daily?
It focuses on standard five-field cron expressions and validates those reliably. For named shortcuts, expand them to the equivalent five-field form first.
Keywords
- cron
- schedule
- expression
- interval
- job
- parse
- time