How to create multiple log files and append logs in that file using winston library

Question

I am using Winston library in nodes for error logs. Now what I want is to create multiple logger files dynamically.

The code I am using is this

const fs = require("fs");
const winston = require("winston");
const logDir = "log";

if (!fs.existsSync(logDir)) {
    fs.mkdirSync(logDir);
}

const tsFormat = () => (new Date()).toLocaleTimeString();
module.exports = logger = winston.createLogger({
    transports: [
        new (winston.transports.Console)({
            format: winston.format.combine(
                winston.format.colorize(),
                winston.format.timestamp(),
                winston.format.align(),
                winston.format.simple(),
            ),
            level: 'info'
        }),
        new (require("winston-daily-rotate-file"))({
            filename: `${logDir}/-results.log`,
            format: winston.format.combine(
                winston.format.timestamp(),
                winston.format.json(),
            )
        }),
        new winston.transports.File({ 
            filename: 'log/error.log', 
            level: 'error',
            format: winston.format.combine(
                winston.format.timestamp(),
                winston.format.simple(),
            )
        }),
    ]
});

I need something like if I pass a filename calling logger

logger.info(`Test info Log!`,'filename');

It should log file in this filename. if file doesn't exist it creates it and appends everything in that file

create multiple loggers: github.com/winstonjs/…

Paolo
– Paolo

2018-07-26 21:02:00 +00:00
Commented Jul 26, 2018 at 21:02 — Paolo
– Paolo, Commented Jul 26, 2018 at 21:02

Harshal Yeole · Accepted Answer · 2018-07-27 06:49:20Z

1

What you are trying to achieve here is creating the log files dynamically by specifying the filename.

Which is Not Possible as we have to declare the files and logger options while we instantiate the logger instance in the winston.js file.

Here:

module.exports = logger = winston.createLogger({}

And you cannot update it on the go!

Hope I have cleared your thoughts!

answered Jul 27, 2018 at 6:49

Harshal Yeole

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