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winston

A multi-transport async logging library for Node.js

  • 0.8.3
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  • npm
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11M
decreased by-11.49%
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4
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What is winston?

Winston is a versatile logging library for Node.js. It is designed to be a simple and universal logging library with support for multiple transports. A transport is essentially a storage device for your logs. Winston allows you to query your logs and can be extended with custom transports, which means that you can write your own storage devices. It is also capable of logging with different levels of severity, which can be useful for filtering logs based on importance.

What are winston's main functionalities?

Logging with different severity levels

This code sets up Winston to log messages of different severity levels, which include error, warn, info, verbose, debug, and silly. It also demonstrates how to add multiple transports; in this case, it logs to two files and optionally to the console when not in production.

{"const winston = require('winston');\nconst logger = winston.createLogger({\n  level: 'info',\n  format: winston.format.json(),\n  transports: [\n    new winston.transports.File({ filename: 'error.log', level: 'error' }),\n    new winston.transports.File({ filename: 'combined.log' })\n  ]\n});\n\nif (process.env.NODE_ENV !== 'production') {\n  logger.add(new winston.transports.Console({\n    format: winston.format.simple()\n  }));\n}\n\nlogger.error('Error log example');\nlogger.warn('Warning log example');\nlogger.info('Information log example');\nlogger.verbose('Verbose log example');\nlogger.debug('Debug log example');\nlogger.silly('Silly log example');"}

Custom log formats

This code demonstrates how to create a custom log format using Winston's format.combine method. It includes a timestamp and prints the log level and message in a custom format.

{"const winston = require('winston');\nconst logger = winston.createLogger({\n  transports: [\n    new winston.transports.Console()\n  ],\n  format: winston.format.combine(\n    winston.format.timestamp({\n      format: 'YYYY-MM-DD HH:mm:ss'\n    }),\n    winston.format.printf(info => `${info.timestamp} ${info.level}: ${info.message}`)\n  )\n});\n\nlogger.info('Custom format log example');"}

Querying logs

This code snippet shows how to query logs from a file transport. It retrieves logs from the last 24 hours, limits the results to 10, and orders them in descending order.

{"const winston = require('winston');\nconst logger = winston.createLogger({\n  transports: [\n    new winston.transports.File({ filename: 'combined.log' })\n  ]\n});\n\nlogger.query({\n  from: new Date() - (24 * 60 * 60 * 1000),\n  until: new Date(),\n  limit: 10,\n  start: 0,\n  order: 'desc',\n}, function (err, results) {\n  if (err) {\n    throw err;\n  }\n  console.log(results);\n});"}

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Package last updated on 04 Nov 2014

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