vladmelnikov / nest-winston Goto Github PK

A Nest module wrapper for winston logger.

npm install --save nest-winston winston

Import WinstonModule into the root AppModule and use the forRoot() method to configure it. This method accepts the same options object as createLogger() function from the winston package:

import { Module } from '@nestjs/common';
import { WinstonModule } from 'nest-winston';
import * as winston from 'winston';

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

Afterward, the winston instance will be available to inject across entire project using the winston injection token:

import { Controller, Inject } from '@nestjs/common';
import { Logger } from 'winston';

@Controller('cats')
export class CatsController {
  constructor(@Inject('winston') private readonly logger: Logger) { }
}

Note that WinstonModule is a global module, it will be available in all you feature modules.

Caveats: because the way Nest works, you can't inject dependencies exported from the root module itself (using exports). If you use forRootAsync() and need to inject a service, that service must be either imported using the imports options or exported from a global module.

Maybe you need to asynchronously pass your module options, for example when you need a configuration service. In such case, use the forRootAsync() method, returning an options object from the useFactory method:

import { Module } from '@nestjs/common';
import { WinstonModule } from 'nest-winston';
import * as winston from 'winston';

@Module({
  imports: [
    WinstonModule.forRootAsync({
      useFactory: () => ({
        // options
      }),
      inject: [],
    }),
  ],
})
export class AppModule {}

The factory might be async, can inject dependencies with inject option and import other modules using the imports option.

If you want to use winston logger across the whole app, including bootstrapping and error handling, use the following:

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  app.useLogger(app.get('NestWinston'));
}
bootstrap();