I can not colorize only the console logger

[sandrocsimas]

Please tell us about your environment:

• winston version?
  • winston@2
  • winston@3
• node -v outputs: v8.10.0
• Operating System? Linux
• Language? ES6

What is the problem?

I can not colorize only the console logger.

const fileLogger = winston.createLogger({
  level,
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.printf(info => `${info.timestamp} - ${info.level}: ${info.message}`),
  ),
  transports: [
    new winston.transports.Console({
      format: winston.format.colorize(),
    }),
    new winston.transports.File({
      filename: path.resolve('project.log')
    }),
  ]
});

Console output:

2018-06-28T16:50:50.414Z - info: Using development environment settings
2018-06-28T16:50:50.417Z - info: Debug mode is ON
2018-06-28T16:50:50.417Z - info: Configuring routes
2018-06-28T16:50:50.423Z - info: Intercambio Backend server is listening on port 3000

The console output above does not colorize the message.

What do you expect to happen instead?

I want the colorized message only in the console logger. The file should keep printing without color.

[ChrisAlderson]

The formats are applied in order meaning the logger formats are applied first, then the transport formats are applied. The following example would get the wanted result:

const myFormat = winston.format.printf(info => `${info.timestamp} - ${info.level}: ${info.message}`);

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.timestamp(),
  transports: [
    new winston.transports.Console({
      format: winston.format.combine(
        winston.format.colorize(),
        myFormat,
      )
    }),
    new winston.transports.File({
      filename: path.resolve('project.log'),
      format: myFormat,
    }),
  ]
});

[dimadk24]

To get out of the box easy colorizing in dev console with less code check out related a comment in a similar issue: #1135 (comment)

[greatertomi]

This works for me.

const colorsConfig = {
  error: 'red',
  warn: 'yellow',
  info: 'green',
  debug: 'cyan'
};

const colorizer = winston.format.colorize({ all: true, colors: colorsConfig });

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.printf(({ level, message, timestamp, ...args }) => {
      const coloredLevel = colorizer.colorize(level, `[${level.toUpperCase()}]`);
      return `${timestamp} ${coloredLevel}: ${message} ${
        Object.keys(args).length > 0 ? JSON.stringify(args, null, 2) : ''
      }`;
    })
  ),
 ...
});