Create Task Scheduler

• Task scheduling allows you to schedule arbitrary code (methods/functions) to execute at a fixed date/time, at recurring intervals, or once after a specified interval.
• In the Linux world, this is often handled by packages like cron at the OS level.

    npm install --save @nestjs/schedule

    export interface Cat {
        name: string;
        age: number;
    }

Add module in app

    import { Module } from '@nestjs/common';
    import { ScheduleModule } from '@nestjs/schedule';

    @Module({
    imports: [
        ScheduleModule.forRoot()
    ],
    })
    export class AppModule {}

Create Scheduler class

    import { Injectable, Logger } from '@nestjs/common';
    import { Cron } from '@nestjs/schedule';

    @Injectable()
    export class TasksService {
    
        private readonly logger = new Logger(TasksService.name);

        @Cron('45 * * * * *')
        handleCron() {
            this.logger.debug('Called when the current second is 45');
        }

    }

Cron Expression

* * * * * * *
| | | | | |
| | | | | day of week
| | | | months
| | | day of month
| | hours
| minutes
seconds (optional)