kellog

kellog is a simple logging middleware for Koa 2.

Usage

Pass kellog as the first middleware on your app for the best results:

'use strict'
 
let Koa = require('koa')
let logger = require('kellog')
 
let app = new Koa
 
app.use(logger())
 
// Other middleware...
 
app.listen(3000)

Configuration

kellog accepts an options hash:

let options = {
  formats: {
    time: 'DD MMM - HH:MM:ss'
  }
}
 
app.use(logger(options))

formats

kellog uses formats to determine how it will log its output to the console. There are currently only a couple of formats available for editing:

output

default: [:start] :method ":url" - :duration ms

The output format determines how kellog will write its logs. All replacements are formatted as a variable name prefixed with :. Currently kellog supports being passed any property available on app.context plus a few extras:

start

This is the time that the server received the request

end

This is the time that the server completed all downstream middleware and returned to kellog

duration

This is the how long, in milliseconds, the server took to complete the request.

time

default: x

kellog uses Moment.js for displaying dates and times. This will be passed directly to Moment so any formating string that Moment accepts will work here, too. Here's a list of Moment formating options.