🧠 @sourceregistry/node-logger – Advanced Logging Framework [WORK IN PROGRESS]

A powerful, pluggable TypeScript logger for Node.js applications.
Supports JSON, text, CEF, and Syslog formatting, multiple transport targets (console, file, HTTP, Elasticsearch), and auto-flush strategies for production-grade logging.

🚀 Features

• Log Levels: TRACE, DEBUG, INFO, WARN, ERROR, FATAL
• Formatters:
  • JSONFormatter – machine-readable
  • TextFormatter – human-friendly
  • CEFFormatter – Common Event Format for SIEM
  • SyslogFormatter – Syslog-compatible format
• Transports:
  • ConsoleTransport
  • FileTransport, BufferedFileTransport, SmartFileTransport
  • HTTPTransport, ElasticsearchTransport
  • WorkerTransport – offload to worker thread
• Auto-flushing: Configurable by interval, size, severity, and idle timeout
• Tagging & Contextual Logging
• Asynchronous-safe, fault-tolerant design

📦 Installation

npm install @sourceregistry/node-logger

🛠 Usage

Basic Logger

import { Console, LogLevel } from '@sourceregistry/node-logger';

const logger = Console(LogLevel.DEBUG);
logger.info('App started');
logger.debug('Debugging details');

File Logger with JSON output

import { File } from '@sourceregistry/node-logger';

const fileLogger = File('./logs/app.log');
fileLogger.info('Writing to log file');

Elasticsearch Integration

import { Elasticsearch } from '@sourceregistry/node-logger';

const esLogger = Elasticsearch({
  endpoint: 'https://es.example.com/_bulk',
  apiKey: 'your-api-key',
  index: 'logs'
});

esLogger.error('Something went wrong!');

🧩 Advanced Features

Smart File Logging

import { SmartFileTransport, Logger, LogLevel } from '@sourceregistry/node-logger';

const logger = new Logger(LogLevel.INFO, [
  new SmartFileTransport('./logs/smart.log', undefined, LogLevel.INFO, {
    enabled: true,
    interval: 5000,
    onSize: 50,
    onLevel: LogLevel.ERROR,
    onIdle: 10000
  })
]);


// DEMONSTRATION:
logger.info('This will be buffered');
logger.debug('This will also be buffered');
// ... After 5 seconds, both logs auto-flush to disk

logger.error('This flushes immediately!'); // Because onLevel: ERROR
logger.warn('This will auto-flush based on smart rules'); // Because onLevel: WARNING

Tagged Logger

const taggedLogger = logger.withTags('auth', 'payment');
taggedLogger.info('User logged in');

🧼 Graceful Shutdown

process.on('SIGTERM', async () => {
  await logger.close();
  process.exit(0);
});

📜 License

Apache-2.0

🤝 Contributing

We welcome issues, feature requests, and pull requests!