Simple Node.js Logger

A simple, lightweight logging library for Node.js with colorized console output and file logging support.

Features

• 📝 Multiple log levels (info, error, warn, debug)
• 🎨 Colorized console output
• 💾 Optional file logging
• 📂 Automatic log file rotation
• 📦 Zero-dependencies (except for chalk for colors)

Installation

npm install @rxpm/logger

Usage

Basic Usage

import logger from '@rxpm/logger';

// Log messages with different levels
logger.info('app', 'Application started');
logger.warn('auth', 'User session about to expire');
logger.error('db', 'Connection failed', { error: err });
logger.debug('cache', 'Cache miss', { key: 'user:123' });

With File Logging

import { Logger } from '@rxpm/logger';

// Initialize with log file
const logger = new Logger('./logs/app.log');

logger.info('app', 'This will be logged to both console and file');

Log Format

Logs are formatted as:

TIMESTAMP LEVEL NAMESPACE MESSAGE

Example:

2023-08-16T16:05:23.123Z INFO  app Server started on port 3000

API

new Logger([filepath])

Creates a new Logger instance.

• filepath (String): Optional path to the log file. If not provided, logs will only be output to the console.

Methods

logger.info(namespace, ...args)

Logs an info message.

• namespace (String): Log category/namespace
• ...args: Values to log

logger.error(namespace, ...args)

Logs an error message.

logger.warn(namespace, ...args)

Logs a warning message.

logger.debug(namespace, ...args)

Logs a debug message.

License

ISC © Rajat Sharma