CSS Lint is an app that allows users to scan and check CSS codes for syntax, performance, and style issues. It can open and check .css files, and users can paste or type CSS source code to check for potential issues. Checking is done with just one click or the ⌘L keyboard shortcut. The lint results are intuitive, showing the location and message describing the issue. Double-clicking an item will bring users to the specific location where the issue is found. Preferences can be accessed with ⌘, and various options are available.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
