winston

Versatile, multi-transport logging library for Node.js — log to console, files, databases, and external services simultaneously.

winston

Node.js

Versatile, multi-transport logging library for Node.js — log to console, files, databases, and external services simultaneously.

npm GitHub Docs

Fit

Bundle (gzip)

38.0 kB

149.7 kB raw

Install size includes transitive dependencies. Bundle size is gzipped browser payload.

Freshness

The Problem

Production applications need logs sent to multiple destinations — console during development, files in staging, and a service like Datadog or Loggly in production — with different formats and log levels per destination.

What It Does

Winston lets you configure multiple transports (Console, File, HTTP, Stream) on a single logger. Each transport can have its own log level, format, and error handling. Custom formats using winston.format.combine() let you add timestamps, colorize output, or serialize to JSON.

Installation

bash

npm install winston

Usage Example

typescript

import winston from 'winston';

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.json()
  ),
  transports: [
    new winston.transports.Console({ format: winston.format.colorize({ all: true }) }),
    new winston.transports.File({ filename: 'logs/error.log', level: 'error' }),
    new winston.transports.File({ filename: 'logs/combined.log' }),
  ],
});

logger.info('Server started', { port: 3000 });
logger.error('Unhandled exception', { err: error.message });

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