nestjs winston log file is written with colors encoding

Question

I am facing the same issue as https://github.com/winstonjs/winston/issues/1416 where logger.info('Hello there. How are you?'); is resulting �[32minfo�[39m: �[32mHello there. How are you?�[39m

I don't know where colorize is so that I can remove it, here is my code:

  new winston.transports.File({
    format: winston.format.combine(
      winston.format.colorize({ // I added this but it's still not helping
        all: false,
        message: false,
        level: false,
      }),
      winston.format.label({ label: 'API' }),
      winston.format.timestamp(),
      winston.format.printf(({ level, message, label, timestamp }) => {
        return `${timestamp} [${label}] ${level}: ${message}`;
      }),
    ),
    filename: environment.logDirectory,
    level: 'http',
    maxsize: 1024 * 1024 * 10,
  }),

In main.ts, I have

import { WINSTON_MODULE_NEST_PROVIDER } from 'nest-winston';
app.useLogger(app.get(WINSTON_MODULE_NEST_PROVIDER));

In AppModule.ts, I have the following:

import { WinstonModule } from 'nest-winston';
...
    WinstonModule.forRoot({
      transports,
    }),

I can't find anywhere that uses colorize() and I don't know how can I disable it.

I am using "nest-winston": "^1.4.0", and "winston": "^3.3.3",

Answer 1

Add winston.format.uncolorize() method to the formatting options to strip color encoding from your winston output

  format: winston.format.combine(
     winston.format.uncolorize()
     ...

Cheers