Logger Utility

A simple Winston-based logger with automatic file and console logging, structured JSON output, Bangkok timezone timestamps, and optional console override for consistent logging across your Node.js application.

Features

• Logs to file and console simultaneously
• JSON format with timestamp and stack traces for errors
• Automatic service/file tagging for child loggers
• Optional console override to forward console.log, console.error, etc. to Winston
• Handles Error objects and structured metadata

Installation

npm install logger-sri-winston

Usage

const { getLogger } = require("logger-sri-winston");

const logger = getLogger(__filename);

logger.info("Server started");
logger.warn("This is a warning");
logger.error(new Error("Something went wrong"));

Output (JSON):

{
  "level": "info",
  "message": "Server started",
  "service": "server",
  "timestamp": "2026-03-25T09:00:00"
}

Override Console

Forward all console logs to Winston, keeping structured logging consistent:

• Supports: console.log, console.error, console.warn, console.debug, console.trace
• Error objects are automatically formatted with stack traces 0 Extra objects are included under the extra key in JSON logs

const { getLogger, overrideConsole } = require("logger-sri-winston");

const logger = getLogger(__filename);
const { console, restore } = overrideConsole(logger);

console.log("Hello World", { user: "santi" });
console.error(new Error("Oops!"));

restore(); // restore original console

Child Logger Per File

Automatically tags each log with the file/service name:

const logger = getLogger(__filename);
logger.info("This log includes the file name as service");

Logger Format

All logs are in JSON format:

{
  "level": "info",
  "message": "Hello World",
  "service": "server",
  "extra": { "user": "santi" },
  "timestamp": "2026-03-25T09:00:00"
}

Notes

• Timestamp is Bangkok time (Asia/Bangkok)
• Ensure logs folder exists; otherwise, Winston will throw an error
• console.trace is preserved as original console behavior