Winston: Better way to Dynamically change the log level

Created on 19 Oct 2017 · 4Comments · Source: winstonjs/winston

As per Winston's Documentation

You may also dynamically change the log level of a transport:

Winston 2.x

  var logger = new (winston.Logger)({
    transports: [
      new (winston.transports.Console)({ level: 'warn' }),
      new (winston.transports.File)({ filename: 'somefile.log', level: 'error' })
    ]
  });
  logger.debug("Will not be logged in either transport!");
  logger.transports.console.level = 'debug';
  logger.transports.file.level = 'verbose';
  logger.verbose("Will be logged in both transports!");

Winston 3.x

const transports = {
  console: new winston.transports.Console({ level: 'warn': level: 'warn' }),
  file: new winston.transports.File({ filename: 'combined.log', level: 'error' })
};

const logger = winston.createLogger({
  transports: [
    transports.console,
    transports.file
  ]
});

logger.info('Will not be logged in either transport!');
transports.console.level = 'info';
transports.file.level = 'info';
logger.info('Will be logged in both transports!');

How can i change level in 3.0 if i created like this
var logger = new (winston.Logger)({ transports: [ new (winston.transports.Console)({ level: 'warn' }), new (winston.transports.File)({ filename: 'somefile.log', level: 'error' }) ] });

Isn't it obvious that the previous version of the dynamic level change mechanism is far more better than new one .

duplicate

Source

mohanen

👍3 😕2

All 4 comments

I am also looking for the solution to winston 3.x as similar to above

kuttiraja on 3 Nov 2017

😕2

I had the transports outside the winston.create() function and changed from outside, it worked!

var transportsList =  const transports = {
  console: new winston.transports.Console({ level: 'warn': level: 'warn' }),
  file: new winston.transports.File({ filename: 'combined.log', level: 'error' })
};
var logger = new (winston.Logger)({
  transports: transportsList
});

//Then change below
transportsList.console.level = 'silly'

jkomban on 9 Nov 2017

Closing as a duplicate of #1191. This is on our roadmap and will be fixed before [email protected] gets released on May 29th, 2018.

indexzero on 26 Apr 2018

👎1

This worked for me, I gave each transport a name, Keyed by the name so I can have access to it via ref since the logger object is inaccessible directly.
`

    var self = this;
    self.logger = self.winston.createLogger({
            levels:self.winston.config.syslog.levels
            ,transports:
                [
                    new self.winston.transports.Console({
                        level: self.config.console.level.ref
                        ,formatter: self._consoleLogFormatter
                        ,name: 'console'
                    })
                ]
        });

        self.transports = _.keyBy(self.logger.transports,"name");
        self.transports.console.level = 'info';