Current version: 1.4.13
Change log
log4javascript is a JavaScript logging framework based on the Java logging framework log4j.
log4javascript 1.4.13 released
log4javascript 1.4.13 is now available. This is a minor release that fixes an issue with
BrowserConsoleAppender introduced in version 1.4.12.
Start logging straight away
It takes one <script> include tag and one line of JavaScript to start using
log4javascript. See the quick start tutorial to get started
straight away, or have a look at the basic demo page to see it
in action now.
Cross-browser JavaScript logging
log4javascript is designed to work in all major browsers. Internet Explorer 5 onwards on Windows, Firefox 1.0 onwards, Safari 1.2 onwards, Opera 8.01 onwards, Konqueror 3.4 onwards and Google Chrome are all fully supported.
Flexible logging
The default way to display log messages is in a separate log4javascript window, featuring advanced search and filtering functionality, as well as a command line. You can also log to an in-page log4javascript console, to Firebug, to Opera and Safari's built-in error consoles or back to the server via Ajax.
Familiar API
log4javascript's API is heavily based on log4j. log4j's API has been ported to many other languages so will be familiar to a large number of developers. log4javascript implements the key log4j concepts of loggers, appenders, layouts and levels.
Rigorously tested
log4javascript is extensively tested and comes with its own test runner and suite of unit tests.
Licence
log4javascript is licenced under the Apache License, Version 2.0.