How to Handle ..Unhandled 'error' event in nodejs

Question

I am getting below error and I also know that it is throwing because the server.log file does not exist.

But what I want to know is how to handle this error programmatically like we do for unCaughtException e.g

process.on('unCaughtException', function(err){
    logger.error(err1)
})

Below is the error, I am getting:

events.js:141
  throw er; // Unhandled 'error' event
  ^

Error: ENOTDIR: not a directory, stat '../logs/server.log'
at Error (native)

Below is the actual code ..that is throwing this error.

module.exports = new winston.Logger({
transports: [
new winston.transports.File({
  level: 'info',
  filename: '../logs/server.log',
  json: false,
  maxsize: 5242880, //5MB
  maxFiles: 2,
  colorize: false
}),
new winston.transports.Console({
  level: 'debug',
  json: false,
  colorize: true
})
],
exitOnError: false
});

unCaughtException event name is wrong, uncaughtException is the right name. (this is a comment, not an aswer) — Daniele Cruciani
– Daniele Cruciani, Commented Apr 25, 2018 at 11:11

robertklep · Accepted Answer · 2016-01-10 08:29:00Z

1

Judging by your code, you're using an event emitter that is emitting an error event when errors happen, in which case you need to listen for those events:

someLibrary({ logfile : '../logs/server.log' }).on('error', function(err) {
  ...handle the error...
});

More info here.

EDIT: in the specific situation of Winston, you should attach an error event handler to the transport instance:

module.exports = new winston.Logger({
  transports: [
    new winston.transports.File({
      level: 'info',
      filename: '../logs/server.log',
      json: false,
      maxsize: 5242880, //5MB
      maxFiles: 2,
      colorize: false
    }).on('error', function(err) {
      console.error(err.stack);
    }),
    new winston.transports.Console({
      level: 'debug',
      json: false,
      colorize: true
    })
  ],
  exitOnError: false
});

edited Jan 10, 2016 at 8:29

answered Jan 9, 2016 at 15:34

robertklep

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4 Comments

Vikash Over a year ago

Thanks robert for quick suggestion...yes I am using winston moudle to configure logger

robertklep Over a year ago

@Vikash check out this documentation about Winston-specifics (although I wonder if that applies to errors thrown by Winston itself).

Vikash Over a year ago

I gone through the link u shared...will try for sure..but that looks more for handling exception ..not the error...is there not any other easy way to handle this...

Vikash Over a year ago

In below link... github.com/winstonjs/… given, I tried ....logger.on('error', function (err) { /* Do Something */ }); but this did not work

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