CODEWITHSUNDEEP
javascriptnode.jsexpresswinston
nikhil.g777
nikhil.g777

Reputation: 904

How to use a library in multiple files in Nodejs

I want to use Winston for logging in my nodejs express project. In my main file( server.js ) I have the following code : 

const winston = require('winston');
winston.level = process.env.LOG_LEVEL
winston.log('info', 'Hello log files!')

I want to use this library in other files as well, so do I have to add these 2 lines to every file I want to use it or is there a better way to do it.

Upvotes: 0

Views: 390

Answers (3)

Beejay
Beejay

Reputation: 303

The preferred way of doing this is adding your custom logger to the winston object:

var winston = require('winston');

// add a new logger to the winston object
winston.loggers.add('logger1', {
  console: {
    level: 'silly',
    colorize: true,
    label: 'Console One'
  },
  file: {
    filename: '/path/to/your/logfile.log'
    level: process.env.LOG_LEVEL
  }
}

After setting up your logger as described in the snippet above you can just "get" the logger in any other file in your application:

var winston = require('winston');

// get your preconfigured logger
var myLogger = winston.loggers.get('logger1');

// start logging!
myLogger.error('FooError');
myLogger.log('warn', 'Exiting application');

This is also the way, which is described in the winston documentation: Winston Docs

Upvotes: 1

emil
emil

Reputation: 6364

You can export and call it like this.

const winston = require('winston');
winston.level = process.env.LOG_LEVEL
module.exports = winston;

In other file

const winston = require('/path/to/winston');
winston.log('blah blah');

Or, just make it global and call it. (not recommended)

const winston = require('winston');
winston.level = process.env.LOG_LEVEL
global.WINSTON = winston;

...

// other file
WINSTON.log('blah')

Upvotes: 1

Goor Lavi
Goor Lavi

Reputation: 412

you can create customWinston.js File:

let winston = require('winston');
winston.level = process.env.LOG_LEVEL
winston.log('info', 'Hello log files!')

exports.customWinston = winston;

and then require your custom Winston:

let customWinston = require('./customWinston').customWinston;

Upvotes: 1

Related Questions