Cron Parser — Read a Schedule in Plain English
This translates a cron expression into a description of when it actually fires, with the next several run times listed. Cron syntax is compact, positional and easy to misread, and the cost of a misreading is either a job that never runs or one that runs thousands of times more often than intended.
When it helps
Because the two classic errors look almost identical to the right answer. Confusing the minute and hour fields turns a daily job into an hourly one. Using a step value where a single value was meant turns a daily job into one that fires every minute — which, for anything that sends email or calls a paid API, is discovered financially. Reading the next few run times before deploying takes seconds and catches both.
Worth running automatically
The more interesting failure is the opposite one: a scheduled job that silently stops. A crashed scheduler, a container that was not restarted, a cron entry lost in a migration — none produce an error, because the failure is an absence. Nothing is more invisible than a job that does not run. The standard answer is a heartbeat: the job checks in when it completes, and something alerts when a check-in is missed rather than when a run fails.
What you get out of it
Prevents the misread that turns a daily job hourly, and points at the harder problem — detecting the run that never happened, which no amount of reading the expression will tell you.