JSLint

JSLint - the JavaScript code quality tool, is now available for OS X! JSLint takes the JavaScript source and scans it. If it finds a problem, it shows a message describing the problem and an approximate location within the source. * Features - Open and check for syntax/performance/security/logic/coding style issues in your .js file. - Paste/type the JavaScript source code and check for any potential issues immediately. - Simply one click or press the "Command-L" keyboard shortcut, checking is done. - The lint results are intuitive, including the location and the message describing the issue. - Double click on a result item will bring you to the specific location where the issue is found. - Various options are available in the Preferences ("Command-," to open the Preferences window).