Avlogs NPM | npm.io

avlogs

A simple and configurable logging utility for Node.js applications. It supports different log levels, log rotation based on size or time, and configurable log file organization.

Features

Supports log levels: debug, info, warn, and error.
Logs can be written to different files based on severity or combined into one file.
Log rotation strategies: by size, daily, weekly, or monthly.
Configurations are loaded from a .env file in the root directory.
Logs include timestamps and the package name.
Option to log messages to the console.

Installation

npm install avlogs

Configuration

Create a .env file in the root directory of your project with the following variables:

# Logging level: debug, info, warn, error
LOG_LEVEL=debug

# Directory where logs will be stored
LOG_DIR=logs

# Separate logs: Errors & Warnings in one file, Info & Debug in another
LOG_FILE_ERROR_WARN=errors.log
LOG_FILE_INFO_DEBUG=info_debug.log

# Combined log file (for all logs together)
LOG_FILE_ALL=combined.log

# Log rotation strategy: "size", "daily", "weekly", "monthly"
LOG_ROTATION=daily

# Maximum file size before rotation (in bytes)
LOG_MAX_SIZE=1048576  # 1MB

# Log to console? (true/false)
LOG_CONSOLE=true

# Log file combination mode:
# "all" = all logs in one file
# "error_warn" = errors & warnings in one file, info & debug in another
LOG_COMBINATION=error_warn

Usage

Importing and Using AVlogs

require("dotenv").config();
const LogRecorder = require("./avlogs");

const logger = new Avlogs();

logger.info("Application started successfully");
logger.debug("Debugging mode active");
logger.warn("Low memory warning");
logger.error("Unhandled exception occurred");

Running the sample test script

Sample test script inside _test_/test.js:

require("dotenv").config();
const LogRecorder = require("../avlogs");

const logger = new Avlogs();

logger.info("Application started successfully");
logger.debug("Debugging mode active");
logger.warn("Low memory warning");
logger.error("Unhandled exception occurred");

Run sample test script:

node test

Log File Organization

Depending on the .env configuration:

All logs in one file: Set LOG_COMBINATION=all, logs are written to combined.log.
Separate logs for errors/warnings and info/debug: Set LOG_COMBINATION=error_warn, logs are written to errors.log and info_debug.log.