Cocos Code IDE is the complete toolkit for developing, debugging, publishing cocos2d-x Lua & JavaScript games. It can work together with Cocos2d-x v3.x, Cocos2d-js v3.x and higher versions. For debugging on iOS simulator, please make sure iOS simulator has been installed.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.