winston-transport

What is winston-transport?

The winston-transport package is a base prototype for all transports in the winston logger, a popular logging library for Node.js. Transports are essentially storage devices for your logs. Each instance of a winston logger can have multiple transports configured at different levels, allowing you to control the logging output. The winston-transport package provides the necessary tools to create custom transports, enabling developers to extend logging capabilities to various outputs like files, databases, third-party services, etc.

What are winston-transport's main functionalities?

Custom Transport Creation

This feature allows developers to create custom transports by extending the TransportStream class. The custom transport can then be used to log messages in any way or format, such as sending logs to a remote logging service, writing to a file in a custom format, or even logging to a database. The code sample demonstrates how to create a basic custom transport that logs messages to the console.

const { TransportStream } = require('winston-transport');

 class CustomTransport extends TransportStream {
   constructor(opts) {
     super(opts);
     // Initialization logic here
   }

   log(info, callback) {
     // Perform the writing to the specified output
     console.log(info);
     if (callback) {
       callback();
     }
     this.emit('logged', info);
   }
 }

Other packages similar to winston-transport

bunyan

Bunyan is a simple and fast JSON logging library for Node.js services. Like winston, it supports multiple streams with different log levels for each stream. However, Bunyan's focus on JSON as the primary log output format makes it particularly well-suited for processing logs with log management tools. It differs from winston-transport in that it is a complete logging solution with its own set of transports, rather than a base for creating custom transports.

pino

Pino is a very low overhead Node.js logger, designed for speed and minimal memory consumption. It also focuses on JSON logging and offers a rich set of features, including child loggers and custom serializers. While Pino provides its own transports through a separate module (pino-transport), it shares the concept of extensible logging through transports with winston-transport. Pino and its transport system are optimized for performance, which is a key difference from the more flexible and feature-rich approach of winston-transport.

README

winston-transport

The base TransportStream implementation for winston >= 3. Use these to write ecosystem Transports for winston.

Usage

const Transport = require('winston-transport');
const util = require('util');

//
// Inherit from `winston-transport` so you can take advantage
// of the base functionality and `.exceptions.handle()`.
//
module.exports = class CustomTransport extends Transport {
  constructor(opts) {
    super(opts);

    //
    // Consume any custom options here. e.g.:
    // - Connection information for databases
    // - Authentication information for APIs (e.g. loggly, papertrail,
    //   logentries, etc.).
    //
  }

  log(info, callback) {
    setImmediate(() => {
      this.emit('logged', info);
    });

    // Perform the writing to the remote service

    callback();
  }
};

Tests

Tests are written with mocha, nyc, assume, and abstract-winston-transport. They can be run with npm:

npm test

Author: Charlie Robbins

LICENSE: MIT

Changelog

4.5.0 (2022/02/05)

• [#81] Memory leak fix: do not wait for process.nextTick to clear callbacks
• [#87, #82, #67] Update dependencies, CI config, and linter config