Common web IDE's all embed JSLint error reporting in the editor window while you're typing. I've used Aptana, Zend Studio and Jetbrains PHPStorm, and they all i

Common web IDE's all embed JSLint error reporting in the editor window while you're typing. I've used Aptana, Zend Studio and Jetbrains PHPStorm, and they all integrate jslint (though usually it's disabled by default). I've found phpstorm's check-while-you-type functionality is the most comprehensive, better than jslint.