jj-log

jj-log is a JSON logger that's as extendable as you want it to be.

Installation

$ npm install jj-log

Usage

Logging Strings

var jjLog = require( 'jj-log' )
var log = jjLog()
 
log( 'something happened!' )
// >> {"message":"something happened!", "timestamp":1430337665558}

Logging Objects

var jjLog = require( 'jj-log' )
var log = jjLog()
 
log({
    type: 'user_created',
    user: '[e-mail]'
})
// >> {"type":"user_created", "user": "[e-mail]", "timestamp":1430337665558}

Without Timestamps

var jjLog = require( 'jj-log' )
var log = jjLog({
    timestamps: false
})
 
log({
    message: 'hello'
})
// >> {"message":"hello"}

With Default Data

var jjLog = require( 'jj-log' )
var log = jjLog({
    timestamps: false,
    defaults: {
        level: 'info',
        package: 'jj-log'
    }
})
 
log({
    message: 'hello'
})
// >> {"message":"hello","level":"info","package":"jj-log"}

With Additional Methods

var jjLog = require( 'jj-log' )
var log = jjLog({
    timestamps: false,
    methods: {
        fatal: {
            level: 'fatal',
            shouldWePanic: 'absolutely'
        },
        warn: {
            level: 'warn',
            shouldWePanic: 'probably not'
        }
    }
})
 
log.warn({
    message: 'hello'
})
// >> {"message":"hello","level":"warn","shouldWePanic":"probably not"}
 
log.fatal({
    message: 'hello'
})
// >> {"message":"hello","level":"fatal","shouldWePanic":"absolutely"}

Attributes May Be Functions

var fatalErrorsSoFar = 0
var jjLog = require( 'jj-log' )
var log = jjLog({
    timestamps: false,
    methods: {
        fatal: {
            level: 'fatal',
            errorNumber: function(){
                return fatalErrorsSoFar++
            }
        }
    }
})
 
log.fatal({
    message: 'oops'
})
// >> {"message":"oops","level":"fatal","errorNumber":1}
 
log.fatal({
    message: 'oops again'
})
// >> {"message":"oops again","level":"fatal","errorNumber":2}

Default May be Overriden at Any Level

var jjLog = require( 'jj-log' )
var log = jjLog({
    timestamps: false,
    defaults: {
        level: 'info'
    },
    methods: {
        warn: {
            level: 'warn'
        }
    }
})
 
log()
// >> {"level":"info"}
 
log({
    level: 'uh oh'
})
// >> {"level":"uh oh"}
 
log.warn()
// >> {"level":"info"}
 
log.warn({
    level: 'a bit worse this time'
})
// >> {"level":"a bit worse this time"}

jj-log May be Silenced for Debugging

var jjLog = require( 'jj-log' )
var log = jjLog({
    silent: true
})
 
log()
// >> no output

This can also be acheived by setting the SILENCE_JJ_LOG environment variable to true