Loglevel Debug Plugin

Plugin for JS logger loglevel which allows enable/disable debug output dynamically and draws inspiration from TJ Hollowaychuk's debug.

Features

- Ability to change logging levels of specific modules.
- Ability to turn on/off debug output for specific modules in development.
- Production logging would be all modules with warn, info, error levels,

Installation

``
npm install loglevel-debug
`

`
bower install loglevel-debug
`

Usage

This plugin is deigned to be used standalone.

`js
var log = require('loglevel-debug')('http')
, http = require('http')
, name = 'My App';

// fake app

log('booting %s', name);

http.createServer(function(req, res){
log(req.method + ' ' + req.url);
res.end('hello\n');
}).listen(3000, function(){
log.info('listening');
});

// fake worker of some kind

require('./worker');
`

Example worker.js:

`js
var log = require('loglevel-debug')('worker');

setInterval(function(){
log('doing some work');
}, 1000);
`

Use DEBUG environment variable to control debug output.

`bash
$ DEBUG=http,worker:* node example/app
[DEBUG] http booting %s
[DEBUG] worker:a doing lots of uninteresting work
[DEBUG] worker:b doing some work
[INFO] http listening
[DEBUG] worker:a doing lots of uninteresting work
[DEBUG] worker:a doing lots of uninteresting work
[DEBUG] worker:b doing some work
[DEBUG] worker:a doing lots of uninteresting work
[DEBUG] worker:a doing lots of uninteresting work
`

Logging Methods

[loglevel][1] methods are all supported.

`js


creates a logger for Module1.

log('this is a debug message');
log.debug('this is a debug message');
log.info('this is a info message');
log.warn('this is a warring message');
log.error('this is a errror message');
log.trace('this is a trace message');
`

you can dynamic change specific logger's logging level.

`
log.setLevel(log.levels.INFO)
`

Browser support

This plugin works on browser as well. To enable debug output, you can use its enable public api,

`
loglevelDebug.enable('worker:*');
`

As a loglevel plugin

`js
var loglevel = require('loglevel');
var loglevelDebug = require('loglevel');

loglevelDebug(loglevel);

log.debug('Test');
``

[1]: https://github.com/pimterry/loglevel