A simplified winston logger for your Nestjs applications
This package provides a NestJS logger wrapper around the Winston logger library. It allows you to easily configure and use Winston logger within your NestJS application
To install the package, run
npm install @squareboat/nestjs-logger
OR
yarn add @squareboat/nestjs-logger
To register LoggerModule
with your app, import the module inside AppModule
.
To register the module statically you can do
import { Module } from '@nestjs/common'
import { LoggerModule } from '@squareboat/nestjs-logger'
import winston from 'winston'
@Module({
imports: [
LoggerModule.register({
isGlobal: true,
default: 'properties',
disableConsole: false,
loggers: {
properties: {
level: 'error',
transports: [new winston.transports.Console()],
},
},
}),
],
controllers: [],
providers: [],
})
export class AppModule {}
Use ConfigModule
provided by NestJS to load configurations. To learn about ConfigModule, Click here.
import { registerAs } from '@nestjs/config'
import winston from 'winston'
import path from 'path'
const { combine, timestamp, printf } = winston.format
const myFormat = printf(({ level, message, timestamp }) => {
return `${timestamp} ${level}: ${message}`
})
export default registerAs('logger', () => {
return {
default: 'payments',
disableConsole: process.env.APP_ENV == 'local' ? false : true,
loggers: {
payments: {
level: 'error',
format: combine(timestamp(), myFormat),
transports: [
new winston.transports.File({
filename: path.join(process.cwd(), 'log', '/payments.log'),
level: 'error',
}),
],
},
},
}
})
By setting disbaleConsole
to true you can restrict your console logs to be printed in production or other enviroments.
Note that you can define multiple transports for the same logger
import { Module } from '@nestjs/common'
import { LoggerModule } from '@squareboat/nestjs-logger'
@Module({
imports: [
LoggerModule.registerAsync({
isGlobal: true,
imports: [ConfigModule],
useFactory: (config: ConfigService) => config.get('logger'),
inject: [ConfigService],
}),
],
controllers: [],
providers: [],
})
export class AppModule {}
Transports are the mechanisms by which log messages are delivered to their intended destinations, such as the console, files, or remote servers such as CloudWatch.
To read about other transports that you can use refer to Winston docs.
- Console transport
The
Console
transport sends log messages to the console.
...
transports: [new winston.transports.Console()]
...
- File transport
The
File
transport writes log messages to a file.It is recommended to create your log files inside the root directory under the 'log' folder.
...
transports: [
new winston.transports.File({
filename: path.join(process.cwd(), 'log', '/payments.log')
})
]
...
First import Logger from @squareboat/nestjs-logger
import { Logger } from '@squareboat/nestjs-logger';
To use the logger named "payments" in your application and log an "info" level message, you can use the following code:
Logger('payments').info('Payment successful!!');
To know more about other logging levels refer here.
We have added some useful commands which we think will add value to your workflow.
You can use this command to create a zip of all .logs
file under your root log directory.
To know about contributing to this package, read the guidelines here
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