slick-log

A simple, yet flexible & powerful logging utility for Node.js applications with beautiful console output and file logging capabilities.

Features

• Beautiful colored console output with decorative borders for errors
• File logging disabled by default - only console logging until explicitly enabled
• File logging with automatic rotation
• Separate error log file
• Configurable log levels
• Timestamp formatting
• Log file size management
• Automatic log rotation
• TypeScript support
• Easy enable/disable file logging control

Installation

npm install slick-log

Quick Start

import { Logger, LogLevel } from 'slick-log';

// Console logging only (default behavior)
Logger.info('This only goes to console');
Logger.success('Success message');
Logger.error('Error with decorative border');

// Optional: Set log level (defaults to INFO)
Logger.setLogLevel(LogLevel.DEBUG);

// Optional: Enable file logging
Logger.setLogFiles('./logs/app.log', './logs/error.log');
Logger.info('This goes to both console and files');

// Optional: Disable file logging again
Logger.disableFileLogging();
Logger.info('Back to console only');

Log Levels

The logger supports the following log levels (in order of severity):

• DEBUG (DEBG) - Detailed debugging information
• INFO (INFO) - General information about program execution
• SUCCESS (SUCC) - Successful operations
• WARN (WARN) - Warning messages
• ERROR (EROR) - Error messages
• FATAL (FATL) - Fatal errors that may lead to program termination

Configuration

Log Level

import { Logger, LogLevel } from 'slick-log';

// Set minimum log level
Logger.setLogLevel(LogLevel.DEBUG);

// Get current log level
const currentLevel = Logger.getLogLevel();

File Logging Control

import { Logger } from 'slick-log';

// Check if file logging is enabled (false by default)
const isEnabled = Logger.isFileLoggingEnabled();

// Enable file logging
Logger.setLogFiles('./logs/app.log', './logs/error.log');

// Disable file logging (console logging continues)
Logger.disableFileLogging();

// Configure file size (default: 100MB)
Logger.setMaxFileSize(50); // 50MB

// Configure number of rotated files (default: 5)
Logger.setMaxRotatedFiles(3);

// Wait for all pending file writes to complete
await Logger.waitForWrites();

Output Format

Console Output

The logger provides beautiful, color-coded console output with centered log level labels:

• DEBUG: Gray background with white text
• INFO: Blue background with white text
• SUCCESS: Green background with black text
• WARN: Yellow background with black text
• ERROR: Red background with white text + decorative borders
• FATAL: Bright red background with white text + decorative borders

File Output

Log files contain entries in the following format:

YYYY-MM-DD HH:mm:ss [LEVEL] Message

Default Behavior

• Console logging: Always enabled
• File logging: Disabled by default - only starts when you call setLogFiles()
• Log level: INFO (logs INFO, SUCCESS, WARN, ERROR, FATAL)
• File rotation: 100MB max size, keeps 5 rotated files

TypeScript Support

This package is written in TypeScript and includes type definitions.

License

ISC