How can I add timestamp to logs using Node.js library Winston?

Question

I want to add timestamp to logs. What is the best way to achieve this?

Answer 1

Another solution is wrapping the logger into a file that exports some functions like logger.info(), logger.error(), etc. then you just pass an extra key to be sent on every message log.

loggerService.js

const logger = winston.createLogger({ ... })

function handleLog(message, level) {
  const logData = {
    timestamp: Date.now(),
    message,
  }

  return logger[level](logData)
}

function info(message) {
  handleLog(message, 'info')
}

function error(message) {
  handleLog(message, 'error')
}

function warn(message) {
  handleLog(message, 'warn')
}

module.exports = {
  info,
  error,
  warn
}

whatever-file.js

const logger = require('./services/loggerService')

logger.info('Hello World!')

your-log.log

{"timestamp":"2019-08-21 06:42:27","message":"Hello World!","level":"info"}