Advanced Node.js Logger

A robust logging system built with Winston for Node.js applications, featuring multi-level logging, daily rotation, and comprehensive request tracking.

Features

• Three-tier logging system:

  • Access logs (L1): Basic request/response information
  • Detail logs (L2): Comprehensive debug information
  • Error logs (L3): Error tracking with stack traces

• Daily log rotation with:

  • 200MB file size limit
  • 14-day retention period
  • Automatic file compression

Installation

npm install winston winston-daily-rotate-file node-cron

Usage

const logger = require('./path/to/logger');
const express = require('express');
const app = express();

// Apply logger middleware
app.use(logger.requestLogger);

// Error handling
app.use(logger.errorHandler);

Log Levels

Level	Code	Description
Emergency	0	System is unusable
Alert	1	Immediate action required
Critical	2	Critical conditions
Error	3	Error conditions
Warning	4	Warning conditions
Notice	5	Normal but significant condition
Info	6	Informational messages
Debug	7	Debug-level messages

File Structure

logs/
├── access/
│   └── DD-MM-YYYY-access.log
├── detail/
│   └── DD-MM-YYYY-detail.log
└── error/
    └── DD-MM-YYYY-error.log

Configuration

Customize logging behavior by modifying:

• File rotation schedule in cron expression
• File size limits
• Retention period
• Timestamp format
• Log formats

Features

Request Tracking

• Method and URL logging
• Response time measurement
• Status code monitoring
• IP address logging

Error Handling

• Stack trace capture
• Request context preservation
• Detailed error metadata

Security

• Automatic directory creation
• Safe file rotation
• Error protection

Author

@anusthan12