How to write log to console and file on Node.JS?

Question

I want how to log both to file and console. This is my code snippet:

I want to make it possible to both record to console and record to file. The code below works, but is there any way to do what I just mentioned?

var fs = require("fs");
var Logger = (exports.Logger = {});
var infoStream = fs.createWriteStream("logs/info.txt");
var errorStream = fs.createWriteStream("logs/error.txt");
var debugStream = fs.createWriteStream("logs/debug.txt");

Logger.info = function(msg) {
  var message = new Date().toISOString() + " : " + msg + "\n";
  infoStream.write(message);
};

Logger.debug = function(msg) {
  var message = new Date().toISOString() + " : " + msg + "\n";
  debugStream.write(message);
};

Logger.error = function(msg) {
  var message = new Date().toISOString() + " : " + msg + "\n";
  errorStream.write(message);
};

javiyu · Accepted Answer · 2022-02-25 06:30:34Z

1

I would use winston.

You can create different transports with different options.

export const Logger = winston.createLogger({
  transports: [
    new winston.transports.Console({ silent: process.env.NODE_ENV == "test" }),
    new winston.transports.File({ filename: "log/error.log" }),
  ],
})

For instance if you create a transport for debug/info/error and combine it with silent option so only the wanted files go to the log, there is also a level configuration key, but it will filter out the errors below that level.

answered Feb 25, 2022 at 6:30

javiyu

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