Package Exports

loglevel-debug

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (loglevel-debug) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

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.

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:

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

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

Use DEBUG environment variable to control debug output.

$ 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 methods are all supported.

# creates a logger for Module1.
var log = require('loglevel-debug')('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

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

loglevelDebug(loglevel);

log.debug('Test');