Advanced Express Web Application Development

Logging with Winston

We will now add logging to our application using Winston; let's install Winston:

npm install winston --save

The 404 middleware will need to log 404 not found, so let's create a simple logger module, ./lib/logger/index.js; the details of our logger will be configured with Nconf. We import Winston and the configuration modules. We define our Logger function, which constructs and returns a file logger—winston.transports.File—that we configure using values from our config. We default the loggers maximum size to 1 MB, with a maximum of three rotating files. We instantiate the Logger function, returning it as a singleton.

var winston = require('winston') , config = require('../configuration'); function Logger(){ return winston.add(winston.transports.File, ...