Adding info to exceptions in Winston

server.js

var http = require('http');
var winston = require('winston');

require('winston-papertrail').Papertrail;
var winstonPapertrail = new winston.transports.Papertrail({
  host: 'logs.papertrailapp.com', //change to match your destination
  port: xxxxx, //change to match your port
  program: 'my_node_app'
})

winstonPapertrail.on('error', function(err) {
// Handle, report, or silently ignore connection errors and failures
});

var logger = new winston.Logger({
  transports: [winstonPapertrail],
});

//function to generate a GUID
function Guid(){
  return Math.random().toString(36).replace(/[^a-z]+/g, '')
}

// Configure HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {
  try {
    //create an exception
    const m = 1;
    const n = m + z;
  } catch (err) {

  // create GUID and add it to the error message
  id = ' (' + Guid() + ')'
  err.message =  err.message + id

  //send the error to papertrail
  logger.error(err)

  //send extra info to papertrail with same GUID
  logger.info(id + ': ' + 'var = '+ 'x')

  }

  //basic hello world stuff
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.end("Hello World\n");
});

// Listen on port 80
server.listen(80);

// Put a friendly message on the terminal
console.log("Server running at localhost:80/");