EverCron – Persistent MongoDB Job Scheduler

Persistent cron jobs for Node.js with MongoDB storage.
Survives server restarts and supports flexible scheduling.

🚀 Quick Start

1. Install

npm install evercron mongodb

2. Basic Usage

const { MongoClient } = require('mongodb');
const EverCron = require('evercron');

(async () => {
  // 1. Connect to MongoDB
  const client = await MongoClient.connect('mongodb://localhost:27017');
  const jobs = client.db('myapp').collection('cronJobs');

  // 2. Create scheduler
  const scheduler = new EverCron(jobs);

  // 3. Schedule jobs
  await scheduler.schedule(
    'nightly-backup', 
    'daily at 02:00',
    backupDatabase,
    { timezone: 'Asia/Kolkata' }
  );
})();

🕒 Schedule Formats

| Type | Example | Description | |----------|---------------------|---------------------| | Interval | 'every 30 minutes' | Recurring duration | | Daily | 'daily at 15:30' | Specific time daily | | Cron | '0 * * * *' | Standard cron syntax|

🔧 API Reference

schedule(name, schedule, taskFn, options)

Schedule a new job.

await scheduler.schedule(
  'weekly-report',
  '0 9 * * 1', // Every Monday at 9 AM
  generateReport,
  { 
    maxRetries: 3,
    timezone: 'America/Chicago' 
  }
);

cancel(name)

Cancel a scheduled job.

await scheduler.cancel('obsolete-job');

restore()

Restore scheduled jobs after a server restart.

await scheduler.restore();

🧪 Testing in Development

Manually Trigger a Job

await scheduler.schedule(
  'test-job',
  'every 1 minute', 
  testTask,
  { timezone: 'UTC' }
);

📄 List All Jobs

const jobs = await jobsCollection.find().toArray();
```---

## 🧪 How to Test Jobs in Development?

### Manually Trigger a Job

```js
await scheduler.schedule(
  'test-job',
  'every 1 minute', 
  testTask,
  { timezone: 'UTC' }
);

📋 How to List All Jobs?

const jobs = await jobsCollection.find().toArray();