Cron Builder API — Build and Validate Cron Schedule Expressions
Build and validate cron expressions with human-readable explanations. Generate cron schedules from plain English descriptions. Free API.
What is Cron Expression Building?
Cron building helps you create and validate cron expressions used for scheduling recurring tasks. The API can parse a cron expression and explain what it means in plain English (e.g., */5 * * * * → 'every 5 minutes'), or generate a cron expression from a plain description. It supports all standard cron features including step values, ranges, lists, and special strings (@daily, @hourly).
How to Use It
Call GET /api/v1/cron-builder?expression=%2F5+*+*+*+*. Returns { expression: string, description: string, next_executions: string[], error: string | null }.
Try it live
Test this endpoint in the interactive console
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Frequently Asked Questions
What is the cron format?
Standard 5-field cron: minute hour day-of-month month day-of-week. Use * for any, */n for every n, n-m for range, and a,b,c for lists.