@ecopages/logger

A lightweight, flexible logging library with color support, timestamps, and timer functionality. This logger supports multiple log levels and allows for easy extension and integration into any project.

Features

• Multiple Log Levels: Supports INFO, ERROR, WARN, and DEBUG log levels
• Colored Output: Configurable colors for different log levels in both browser and Node.js environments
• Timestamps: Optional timestamps with configurable formats
• Timer Support: Built-in timer functionality for performance measurements
• Prefixed Messages: Customizable prefix for all log messages
• Environment Detection: Automatically adapts output format for browser or Node.js environments
• Extensible: Easy to extend with custom functionality

Installation

npm install @ecopages/logger
# or
yarn add @ecopages/logger
# or
bun add @ecopages/logger

Basic Usage

import { Logger } from "@ecopages/logger";

// Create a basic logger
const logger = new Logger("[my-app]");

// Log messages at different levels
logger.info("This is an informational message");
logger.warn("This is a warning message");
logger.error("This is an error message");
logger.debug("This is a debug message"); // Only shown if debug is enabled

Advanced Configuration

The logger supports various configuration options:

const logger = new Logger("[my-app]", {
  debug: true,              // Enable debug messages
  color: true,             // Enable colored output
  timestamp: true,         // Add timestamps to messages
  timestampFormat: 'full', // Configure timestamp format
  verboseTimer: true,      // Show timer start messages
  colors: {                // Custom colors
    INFO: 'color: purple',
    ERROR: 'color: darkred'
  }
});

Configuration Options

| Option | Type | Default | Description | |--------|------|---------|-------------| | debug | boolean | false | Enable debug level messages | | color | boolean | true | Enable colored output | | timestamp | boolean | false | Add timestamps to messages | | timestampFormat | 'full' | 'time' | 'short' | 'time' | Timestamp format | | verboseTimer | boolean | false | Show timer start messages | | colors | Partial | - | Custom colors for log levels |

Timestamp Formats

• full: YYYY-MM-DD HH:mm:ss
• time: HH:mm:ss
• short: MM-DD HH:mm:ss

Timer Functionality

// Start a timer
logger.time("operation");

// ... some operations ...

// End the timer and log duration
logger.timeEnd("operation");

Custom Colors

Colors can be customized differently for browser and Node.js environments:

// Browser colors (CSS syntax)
const logger = new Logger("[my-app]", {
  colors: {
    INFO: 'color: purple',
    ERROR: 'color: darkred',
    WARN: 'color: orange',
    DEBUG: 'color: cyan',
    TIMER: 'color: magenta'
  }
});

// Node.js colors (ANSI codes)
const logger = new Logger("[my-app]", {
  colors: {
    INFO: '\x1b[35m',  // Purple
    ERROR: '\x1b[31m', // Red
    WARN: '\x1b[33m',  // Yellow
    DEBUG: '\x1b[36m', // Cyan
    TIMER: '\x1b[35m'  // Magenta
  }
});

Examples

With Timestamps and Colors

const logger = new Logger("[my-app]", { 
  timestamp: true, 
  timestampFormat: 'full' 
});

logger.info("Application started");
// Output: [2024-02-16 15:30:45] [my-app] Application started

With Debug Messages

const logger = new Logger("[my-app]", { debug: true });

logger.debug("Configuration loaded:", { port: 3000 });
// Output: [my-app] Configuration loaded: { port: 3000 }

With Timer

const logger = new Logger("[my-app]", { verboseTimer: true });

logger.time("db-query");
// ... database operation ...
logger.timeEnd("db-query");
// Output: [my-app] db-query: 123.45ms