Advanced Node.js Logger

Implementation of Winston with daily file rotation for logging in 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, and automatic compression
• Request Tracking — Method, URL, response time, status code, and IP address logging
• Error Handling — Stack trace capture, request context preservation, and detailed error metadata
• Security — Automatic directory creation, safe file rotation, and error protection

Installation

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

Usage

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

app.use(logger.requestLogger);  // Apply logger middleware
app.use(logger.errorHandler);   // Error handling

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 the file rotation schedule (cron expression), file size limits, retention period, timestamp format, and log formats.

Author

Built and maintained by Anusthan Singh · © 2025