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Cron for NodeJS.

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README.md

node-cron

Build Status

Originally this project was a NodeJS fork of James Padolsey's cron.js.

After Craig Condon made some updates and changes to the code base this has evolved to something that has a bit of both. The cron syntax parsing is mostly James' while using timeout instead of interval is Craig's.

Additionally, this library goes beyond the basic cron syntax and allows you to supply a Date object. This will be used as the trigger for your callback. Cron syntax is still an acceptable CronTime format.

Usage:

var cronJob = require('cron').CronJob;
cronJob('* * * * * *', function(){
    console.log('You will see this message every second');
}, null, true);

Available Cron patterns:

Asterisk. E.g. *
Ranges. E.g. 1-3,5
Steps. E.g. */2

Read up on cron patterns here.

Another example

var cronJob = require('cron').CronJob;
var job = cronJob('00 30 11 * * 2-6', function(){
    // Runs every weekday (Monday through Friday)
    // at 11:30:00 AM. It does not run on Saturday
    // or Sunday.
});
job.start();

For good measure

var cronJob = require('cron').CronJob;
var job = cronJob({
  cronTime: '00 30 11 * * 2-6',
  onTick: function() {
    // Runs every weekday (Monday through Friday)
    // at 11:30:00 AM. It does not run on Saturday
    // or Sunday.
  },
  start: true
});
job.start();

How to check if a cron pattern is valid:

    try {
        cronJob('invalid cron pattern', function() {
            console.log('this should not be printed');
        })
    } catch(ex) {
        console.log("cron pattern not valid");
    }

Install

From source: `npm install`
From npm: `npm install cron`

API

Parameter Based

CronJob

  • constructor(cronTime, onTick, onComplete, start) - Of note, the first parameter here can be a JSON object that has the below names and associated types (see examples above).
    • cronTime - [REQUIRED] - The time to fire off your job. This can be in the form of cron syntax or a JS Date object.
    • onTick - [REQUIRED] - The function to fire at the specified time.
    • onComplete - [OPTIONAL] - A function that will fire when the job is complete, when it is stopped.
    • start - [OPTIONAL] - Specifies whether to start the job after just before exiting the constructor.
  • start - Runs your job.
  • stop - Stops your job.

CronTime

  • constructor(time)
    • time - [REQUIRED] - The time to fire off your job. This can be in the form of cron syntax or a JS Date object.

Contributors

License

MIT

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