Winston

logging.ts

import * as winston from "winston";

const { Console, File } = winston.transports;
const { combine, timestamp, logstash, colorize, padLevels, printf, label } = winston.format;

const consoleFormat = combine(
  colorize(),
  padLevels(),
  timestamp(),
  printf(info => `${info.timestamp} ${info.level}: ${info.message}`)
);

const logger = winston.createLogger({
  level: 'info',
  defaultMeta: { application: 'myapp', version: "1.0.19753" },
  transports: [
    new Console({ format: consoleFormat }),
    new File({ filename: 'app.log', format: combine(timestamp(), logstash()) })
  ]
});

const childLogger = logger.child({ userId: "toto" });

childLogger.info('Hello  there', { time: 3 });
childLogger.warn('Beware !', { time: 12 });
childLogger.error('Oups !', { time: 7 });