How to use the Logger function from winston

Find comprehensive JavaScript winston.Logger code examples handpicked from public code repositorys.

winston.Logger is a logger object in the Winston library for Node.js that provides customizable logging functionality.

etl-routes.js

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method: 'POST',
path: '/javascript-errors',
config: {
  handler: function (request, reply) {
    if (request.payload) {
      var logger = new winston.Logger({
        transports: [
          new winston.transports.File({
            level: 'info',
            filename: 'client-logs.log',

+ 6 other calls in file

meshconfig.js

GitHub: perfsonar/psconfig-web

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const async = require("async");
const _ = require("underscore");


//mine
var config = require("../config");
const logger = new winston.Logger(config.logger.winston);
const db = require("../models");
const common = require("../common");
const pub_shared = require("./pub_shared");
const rename_underscores_to_dashes = pub_shared.rename_underscores_to_dashes;

+ 2 other calls in file

How does winston.Logger work?

winston.Logger is a constructor function in the winston logging library for Node.js that creates a new instance of a logger, which can be used to log messages to various transports (such as the console, file, or a remote server) with various logging levels and formatting options. When you create a new logger instance with new winston.Logger(options), you can specify options such as the transports to use, the log level threshold, and the format of the log messages. Once you have a logger instance, you can use its methods (log, info, warn, error, etc.) to log messages with various levels and data.

index.js

GitHub: OpenAgenda/oa-public

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function getLogger(options = {}) {
  const callerFile = options.$callerFile || getCallerFile(2);
  const callerModule = options.$callerModule || getModule(path.resolve(callerFile));


  const logger = new winston.Logger({
    transports: getTransporters(
      _.merge({}, options, loggerConfigs.get(callerModule))
    )
  });

Ai Example

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const winston = require("winston");

const logger = winston.createLogger({
  level: "info",
  format: winston.format.json(),
  transports: [
    new winston.transports.Console(),
    new winston.transports.File({ filename: "error.log", level: "error" }),
    new winston.transports.File({ filename: "combined.log" }),
  ],
});

logger.info("Hello, world!");
logger.error("Oops, something went wrong!");

This creates a logger that will output log messages with a level of info or higher to both the console and a file named combined.log. Messages with a level of error or higher will also be logged to a separate file named error.log.

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