@edirect/logger

Structured logging module for eDirect NestJS applications. Built on top of Pino, providing high-performance JSON logging with AsyncLocalStorage support for automatic context propagation, file output, and seamless integration with NestJS.

Features

• ✅ Pino-based - High-performance structured JSON logging
• ✅ AsyncLocalStorage - Automatic context propagation (sessionId, quoteId, correlationId, traceId, userId)
• ✅ SINGLETON Architecture - Better performance
• ✅ Multi-level logging - log, info, warn, error, debug, verbose
• ✅ Enhanced error logging - Multiple overloads with trace support
• ✅ File and console output - Flexible output configuration (stdout/stderr or files)
• ✅ Datadog compatible - ISO 8601 timestamps and structured logs
• ✅ NestJS integration - Native support with middleware
• ✅ Global module - Register once, inject LoggerService anywhere
• ✅ Async configuration - Supports both sync (register) and async (registerAsync) setup

Installation

pnpm add @edirect/logger
# or
npm install @edirect/logger

Quick Start

Basic Usage (Without Middleware)

import { Module } from '@nestjs/common';
import { LoggerModule } from '@edirect/logger';

@Module({
  imports: [LoggerModule],
})
export class AppModule {}

import { Injectable } from '@nestjs/common';
import { LoggerService } from '@edirect/logger';

@Injectable()
export class MyService {
  constructor(private logger: LoggerService) {}

  doSomething() {
    this.logger.info('Operation started', { userId: '123' });
  }
}

With Middleware (Automatic Context from HTTP Headers)

If you want automatic context extraction from HTTP headers, add the middleware:

import { Module, MiddlewareConsumer, NestModule } from '@nestjs/common';
import { LoggerModule, LoggerContextMiddleware } from '@edirect/logger';

@Module({
  imports: [LoggerModule],
})
export class AppModule implements NestModule {
  configure(consumer: MiddlewareConsumer) {
    consumer
      .apply(LoggerContextMiddleware)
      .forRoutes('*'); // Apply to all routes
  }
}

Manual Context Setting

import { Injectable } from '@nestjs/common';
import { LoggerService } from '@edirect/logger';

@Injectable()
export class MyService {
  constructor(private logger: LoggerService) {}

  doSomething() {
    this.logger.info('Operation started', { userId: '123' });
    // sessionId and quoteId automatically included from request context!
  }
}

Configuration

Basic Configuration

import { Module } from '@nestjs/common';
import { LoggerModule } from '@edirect/logger';

@Module({
  imports: [
    LoggerModule.register({
      output: 'console', // 'console' | 'file' | 'both'
      level: 'info',
      logs: {
        infoFile: './logs/info.log',
        warningFile: './logs/warning.log',
        errorFile: './logs/error.log',
        exceptionsFile: './logs/exceptions.log',
      },
      name: 'my-service',
      version: '1.0.0',
    }),
  ],
})
export class AppModule {}

Async Configuration

import { ConfigService } from '@edirect/config';
import { LoggerModule } from '@edirect/logger';

@Module({
  imports: [
    ConfigModule,
    LoggerModule.registerAsync({
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => ({
        output: configService.get('LOGS_OUTPUT'),
        level: configService.get('LOGS_LEVEL'),
        logs: {
          infoFile: configService.get('LOGS_INFO_FILE'),
          warningFile: configService.get('LOGS_WARNING_FILE'),
          errorFile: configService.get('LOGS_ERROR_FILE'),
          exceptionsFile: configService.get('LOGS_EXCEPTIONS_FILE'),
        },
        name: configService.get('APP_NAME'),
        version: configService.get('APP_VERSION'),
      }),
      inject: [ConfigService],
    }),
  ],
})
export class AppModule {}

API Reference

Logging Methods

// Info logging
logger.log(message: string, payload?: any);
logger.info(message: string, payload?: any);

// Warning logging
logger.warn(message: string, payload?: any);

// Debug logging
logger.debug(message: string, payload?: any);
logger.verbose(message: string, payload?: any);

// Error logging (multiple overloads)
logger.error(message: string); // Just message
logger.error(message: string, payload: any); // Message + payload to enrich
logger.error(message: string, trace: string); // Message + stack trace
logger.error(message: string, error: Error); // Message + Error object
logger.error(message: string, payload: any, trace: string); // Full context

Context Management

// Set context manually (useful for background jobs)
logger.setContext('sessionId', 'session-123');
logger.setContext('quoteId', 'quote-456');
logger.setContext('correlationId', 'corr-789');
logger.setContext('traceId', 'trace-abc');
logger.setContext('userId', 'user-xyz');

AsyncLocalStorage for Background Jobs

import { AsyncContextManager } from '@edirect/logger';

@Cron('0 0 * * *')
handleCron() {
  AsyncContextManager.run({ sessionId: 'cron-job', quoteId: 'batch-001' }, () => {
    this.logger.info('Cron job started');
    // Context automatically propagates through all async calls
  });
}

Context Headers

The LoggerContextMiddleware automatically extracts context from these HTTP headers:

• x-session-id → sessionId
• x-quote-id → quoteId
• x-trace-id → traceId
• x-correlation-id → correlationId
• req.user.id → userId

Log Format

All logs are structured JSON with the following fields:

{
  "timestamp": "2024-03-06T14:30:00.123Z",
  "level": "info",
  "message": "Operation completed",
  "name": "my-service",
  "version": "1.0.0",
  "host": "localhost",
  "protocol": "http",
  "sessionId": "session-123",
  "quoteId": "quote-456",
  "correlationId": "corr-789",
  "traceId": "trace-abc",
  "userId": "user-xyz",
  "remote-address": "192.168.1.1",
  "details": { "custom": "data" },
  "trace": "Error stack trace" // Only in error logs
}

Error Logging Examples

// Simple error
logger.error('Something went wrong');

// Error with enrichment details
logger.error('User not found', { userId: '123', action: 'login' });

// Error with stack trace
logger.error('Database error', 'Error: Connection timeout\n  at db.connect...');

// Error with Error object (auto-extracts stack)
try {
  throw new Error('Failed to process');
} catch (error) {
  logger.error('Processing failed', error);
}

// Full context error
logger.error(
  'Complex error',
  { context: 'payment', orderId: '456' },
  'Error stack trace here'
);

License

MIT