Nestjs-logger-roarr NPM

Quickstart

Install

pnpm install nestjs-logger-roarr

Setup

NOTE Do not forget to set ROARR_LOG=true otherwise you will see no log messages!

To use the same logger for lower level NestJS code and your own:

import { RoarrLoggerService } from nestjs-logger-roarr';
import { AppModule } from "app.module";

const logger = RoarrLoggerService.sharedInstance();
const app = await NestFactory.create(AppModule, { logger });

As you might expect, calling RoarrLoggerService.sharedInstance() multiple times returns the same Service.

If you'd like to use the module directly:

import { Module } from '@nestjs/common';
import { RoarrLoggerModule } from 'nestjs-logger-roarr;

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

Note that by importing the module, the lower level NestJS code will use a possibly different logger, while your AppModule will use RoarrLoggerModule. See the previously mentioned .sharedInstance() if you want all logged code to use the RoarrLoggerService.

If you'd like to do build the logger service asynchronously (for example to inject some options):

import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config;
import { RoarrLoggerService } from 'nestjs-logger-roarr;

@Module({
  imports: [
    RoarrLoggerService.forRootAsync({
      imports: [ ConfigModule ],
      useFactory: async (cfg:ConfigService) => ({
        logLevel: 'debug',
        environment: cfg.get('ENVIRONMENT') ?? 'staging',
        ctx: { // Context that is set @ the top level
          appName: cfg.get('APP_NAME'),
        },
      }),
    })
  ]
})

export class AppModule {}

Usage

You can use it from any place Injectables are welcome:

import { Injectable } from '@nestjs/common';
import { RoarrLoggerService } from 'nestjs-logger-roarr;

@Injectable()
export class AppService {
  public constructor(@Inject() private readonly logger: RoarrLoggerService) {}
}

You can use RoarrLoggerService just like the build in Logger via a property in Injectables:

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

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

  doSomething() {
    this.logger.log('Doing something...');
  }
}

Note that RoarrLoggerService extends ConsoleLoggerService (which extends LoggerService), so you can use it anywhere the other interfaces are expected/required.

FAQ

What will log messages look like?

In an example application, the usual startup logs look like this:

{"context":{"in":"NestFactory","logLevel":30,"pid":2225063},"message":"Starting Nest application...","sequence":"0","time":1681023672355,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"DBModule dependencies initialized","sequence":"1","time":1681023672368,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"OpenTelemetryModule dependencies initialized","sequence":"2","time":1681023672368,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"OpenTelemetryCoreModule dependencies initialized","sequence":"3","time":1681023672369,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"ConfigHostModule dependencies initialized","sequence":"4","time":1681023672376,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"ConfigModule dependencies initialized","sequence":"5","time":1681023672376,"version":"2.0.0"}
{"context":{"in":"InstanceLoader","logLevel":30,"pid":2225063},"message":"AppModule dependencies initialized","sequence":"6","time":1681023672376,"version":"2.0.0"}
{"context":{"in":"RoutesResolver","logLevel":30,"pid":2225063},"message":"AppController {/}:","sequence":"7","time":1681023672389,"version":"2.0.0"}
{"context":{"in":"RouterExplorer","logLevel":30,"pid":2225063},"message":"Mapped {/, GET} route","sequence":"8","time":1681023672390,"version":"2.0.0"}
{"context":{"in":"NestApplication","logLevel":30,"pid":2225063},"message":"Nest application successfully started","sequence":"9","time":1681023672392,"version":"2.0.0"}
{"context":{"in":"AppService","logLevel":30,"pid":2225063},"message":"running getHello!!!","sequence":"10","time":1681023676282,"version":"2.0.0"}