Trigger functions or evaluate cron expressions in JavaScript or TypeScript. No dependencies. Most features. Node. Deno. Bun. Browser.
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Trigger functions in javascript using Cron syntax.
Try it live on jsfiddle.
Croner
- Trigger functions in JavaScript using Cron syntax
- Pause, resume or stop execution efter a task is scheduled
- Find first date of next month, find date of next tuesday, etc.
- Works in Node.js >=4.0 (require and import)
- Works in browsers as standalone, UMD or ES-module.
- Experimental feature: Schedule in specific target timezones
- Includes TypeScript typings
Quick examples:
// Run a function at the interval set by a cron expression
let job = Cron('* * * * * *', () => {
console.log('This will run every second');
});
// What date is next sunday?
let nextSunday = Cron('0 0 0 * * 7').next();
console.log(nextSunday.toLocaleDateString());
// How many days left to christmas eve?
let msLeft = Cron('59 59 23 24 DEC *').next() - new Date();
console.log(Math.floor(msLeft/1000/3600/24) + " days left to next christmas eve");
More examples…
Installation
Node.js
npm install croner --save
// ESM Import ...
import Cron from "croner";
// ... or CommonJS Require
const Cron = require("croner");
Browser
Manual
- Download latest zipball
- Unpack
- Grab
croner.min.js
(UMD and standalone) orcroner.min.mjs
(ES-module) from the dist/ folder
CDN
To use as a UMD-module (stand alone, RequireJS etc.)
<script src="https://cdn.jsdelivr.net/npm/croner@4/dist/croner.min.js"></script>
To use as a ES-module
<script type="module">
import Cron from "https://cdn.jsdelivr.net/npm/croner@4/dist/croner.min.mjs";
// ... see usage section ...
</script>
Documentation
Full documentation available at hexagon.github.io/croner.
The short version:
Signature
Cron takes three arguments
var job = Cron("* * * * * *" , /*optional*/ { maxRuns: 1 } , /*optional*/ () => {} );
// If function is omitted in constructor, it can be scheduled later
job.schedule(() => {});
// States
let nextRun = job.next( /*optional*/ previousRun ); // Get a Date object representing next run
let prevRun = job.previous( );
let msToNext = job.msToNext( /*optional*/ previosRun ); // Milliseconds left to next execution
let isRunning = job.running();
// Control scheduled execution
job.pause();
job.resume();
job.stop();
Options
Key | Default value | Data type | Remarks |
---|---|---|---|
maxRuns | Infinite | Number | |
timezone | undefined | String | Timezone in Europe/Stockholm format |
startAt | undefined | String | ISO 8601 formatted datetime (2021-10-17T23:43:00) in local or specified timezone |
stopAt | undefined | String | ISO 8601 formatted datetime (2021-10-17T23:43:00) in local or specified timezone |
paused | false | Boolean | If the job should be paused from start. |
Pattern
// ┌──────────────── (optional) second (0 - 59)
// │ ┌────────────── minute (0 - 59)
// │ │ ┌──────────── hour (0 - 23)
// │ │ │ ┌────────── day of month (1 - 31)
// │ │ │ │ ┌──────── month (1 - 12, JAN-DEC)
// │ │ │ │ │ ┌────── day of week (0 - 6, SUN-Mon)
// │ │ │ │ │ │ (0 to 6 are Sunday to Saturday; 7 is Sunday, the same as 0)
// │ │ │ │ │ │
// * * * * * *
Field | Required | Allowed values | Allowed special characters | Remarks |
---|---|---|---|---|
Seconds | Optional | 0-59 | * , - / | |
Minutes | Yes | 0-59 | * , - / | |
Hours | Yes | 0-23 | * , - / | |
Day of Month | Yes | 1-31 | * , - / | |
Month | Yes | 1-12 or JAN-DEC | * , - / | |
Day of Week | Yes | 0-7 or SUN-MON | * , - / | 0 to 6 are Sunday to Saturday 7 is Sunday, the same as 0 |
Note: Weekday and month names are case insensitive. Both MON and mon works.
Examples
Expressions
// Run a function according to pattern
Cron('0-4 */5 1,2,3 * JAN-MAR SAT', function () {
console.log('This will run the first five seconds every fifth minute');
console.log('of hour 1,2 and 3 every saturday in January to March.');
});
Find dates
// Find next month
let nextMonth = Cron('0 0 0 1 * *').next(),
nextSunday = Cron('0 0 0 * * 7').next(),
nextSat29feb = Cron("0 0 0 29 2 6").next();
console.log("First day of next month: " + nextMonth.toLocaleDateString());
console.log("Next sunday: " + nextSunday.toLocaleDateString());
console.log("Next saturday at 29th of february: " + nextSat29feb.toLocaleDateString()); // 2048-02-29
With options
var job = Cron(
'* * * * *',
{
maxRuns: Infinity,
startAt: "2021-11-01T00:00:00",
stopAt: "2021-12-01T00:00:00",
timezone: "Europe/Stockholm"
},
function() {
console.log('This will run every minute, from 2021-11-01 to 2021-12-01 00:00:00 in Europe/Stockholm.');
}
);
Job controls
let job = Cron('* * * * * *', (self) => {
console.log('This will run every second. Pause on second 10. Resume on second 15. And quit on second 20.');
console.log('Current second: ', new Date().getSeconds());
console.log('Previous run: ' + self.previous());
console.log('Next run: ' + self.next());
});
Cron('10 * * * * *', {maxRuns: 1}, () => job.pause());
Cron('15 * * * * *', {maxRuns: 1}, () => job.resume());
Cron('20 * * * * *', {maxRuns: 1}, () => job.stop());
License
MIT