YUI Developer Tools

Message logging UI. Typically used as a development tool.

The Console Filters plugin adds log message filtering controls to the Console UI

The YUI Profiler is a simple JavaScript code profiler suitable for reviewing the performance of most JavaScript applications.

A JavaScript testing framework with a comprehensive assertion syntax. Suitable for testing YUI-based code, but designed to support test-driven development across any JavaScript project, regardless of whether YUI is involved.

An attractive pre-packaged console widget for displaying YUI Test output.