Cron Expression Builder

Programmatic Access

Cron Expression Builder is also callable as a free HTTP JSON API at https://aidevhub.io/api/cron-expression/build/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, 50 requests/day per IP. Responses return { ok, tool, result, meta }.

curl -s "https://aidevhub.io/api/cron-expression/build/?human=every%20Monday%20at%209%3A00"

Machine-readable contract: /api/tool/cron-builder.json · All API endpoints: /agents/ · LLM site index: /llms.txt

Agent Invocation

REST API

curl "https://aidevhub.io/api/cron-expression/parse/?expression=0+9+*+*+1-5"

const res = await fetch("https://aidevhub.io/api/cron-expression//api/cron-expression/parse/", {
  method: "GET",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "expression": "0 9 * * 1-5"
}),
});
const data = await res.json();
console.log(data);

import requests

res = requests.post(
    "https://aidevhub.io/api/cron-expression//api/cron-expression/parse/",
    json={"expression":"0 9 * * 1-5"},
)
print(res.json())

{
  "valid": true,
  "expression": "0 9 * * 1-5",
  "human": "At 09:00, Monday through Friday"
}

How to Use Cron Expression Builder

1. 1

   Pick a preset or start from scratch

   Open the Presets dropdown for common schedules like every 5 minutes, daily at midnight, or weekdays at 9 AM. The expression updates instantly.

2. 2

   Set each field's mode

   Each field (minute, hour, day, month, weekday) offers Every, Specific, Range, and Step modes. Pick values to build the exact schedule you need.

3. 3

   See the cron expression preview

   The cron syntax (e.g., `0 9 * * 1-5` for 9 AM weekdays) and a plain-English description update in real time as you edit the fields.

4. 4

   Copy cron expression

   Click 'Copy' to copy the expression to your clipboard. Paste into crontab, GitHub Actions, AWS CloudWatch, or any scheduler that uses cron syntax.

5. 5

   Check the next run times

   The 'Next 5 Executions' list updates automatically with upcoming run times in local time, so you can confirm the schedule before deploying.

Frequently Asked Questions