CODEWITHSUNDEEP
node.jsangular
Divesh Soni
Divesh Soni

Reputation: 71

Node JS Mail scheduler

I am working on an Angular(frontend) and NodeJS(APIs) application. I want to schedule email on particular dates without any external call. I explored node-schedule. But how should I ensure that it runs forever in my NodeJs APIs? Like where should I put the code - in app.js or give it a route?

Upvotes: 2

Views: 4505

Answers (5)

Pankaj Jindal
Pankaj Jindal

Reputation: 175

One more thing, if the application is restarts then your schedule event get cancelled. so it might be a good approach if you save your event in a db and marked them complete or incomplete. And re-schedule your incomplete events at the restart of the application.

I use this to make sure all events runs.

Upvotes: 4

Surjeet Bhadauriya
Surjeet Bhadauriya

Reputation: 7156

You are on the right track. You have to use cron service for this. And node-schedule is a good choice for this.

So first, make a file named email-service.js.

Inside that put your logic.

email-service.js

var node = require('node-schedule');

var sendEmail = node.scheduleJob('0 6 * * *', function(){
   console.log('Starting..');
   init(); // write your logic here to send email
});

function init() {
  console.log('Your logic goes here.');
}

module.exports = {
    cronService: cronService
}

app.js

In the app.js import email-service.js.

const emailService = require('email-service')

emailService.sendEmail.start(); // start service..

You can schedule a cron accordingly. Below is the format of the cron.

The cron format consists of:

*    *    *    *    *    *
┬    ┬    ┬    ┬    ┬    ┬
│    │    │    │    │    │
│    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
│    │    │    │    └───── month (1 - 12)
│    │    │    └────────── day of month (1 - 31)
│    │    └─────────────── hour (0 - 23)
│    └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, OPTIONAL)

Upvotes: 5

CvZ
CvZ

Reputation: 26

We use PM2 (https://pm2.io/runtime/) - It's a process manager that keeps your process running and has configuration that will allow you to schedule a node job to run according to a cron schedule. There's alot more to it, but if you're looking to improve the operation of your API, this tool is really good - and free.

Upvotes: 0

Priyank
Priyank

Reputation: 1

You can use node-schedule node module, it's well documented.

Upvotes: 0

Nuru Salihu
Nuru Salihu

Reputation: 4928

Sounds like something you can achieve with nodeCron.

You may have a look at the answer here too

You can shcedule your scheduler to execute on a specific time like 

var schedule = require('node-schedule');

var j = schedule.scheduleJob('42 * * * *', function(){
  console.log('The answer to life, the universe, and everything!');
});

The example above is from node-cron npm page. Please have a look and their github for better understanding.

Upvotes: 1

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