QUESTION: How many log levels are supported?

[janianttonen]

QUESTION: How many log levels are supported?

[JaniAnttonen]

To my knowledge, it's configurable in winston itself – there's a filter for what levels get sent to transports.

So, all these should work (considering you enable silly logs to be passed to transports):

{
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  verbose: 4,
  debug: 5,
  silly: 6
}

[JaniAnttonen]

Found the answer at https://github.com/winstonjs/winston#logging-levels

winston allows you to define a level property on each transport which specifies the maximum level of messages that a transport should log. For example, using the syslog levels you could log only error messages to the console and everything info and below to a file (which includes error messages):

const logger = winston.createLogger({
  levels: winston.config.syslog.levels,
  transports: [
    new winston.transports.Console({ level: 'error' }),
    new winston.transports.File({
      filename: 'combined.log',
      level: 'info'
    })
  ]
});

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

const transports = {
  console: new winston.transports.Console({ 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!');