WP API Menus is a free WordPress plugin that enriches the JSON REST API by adding specific routes for registered menus. This allows developers to efficiently access and manipulate menu data, providing a structured hierarchy of menu items. Key routes include '/menus' for listing all menus, '/menus/' for detailed menu information, and '/menu-locations' for theme locations, significantly boosting theme customization capabilities.

Designed with developers in mind, the plugin's new V2 routes promote better organization through prefixing and namespacing, facilitating seamless integration into existing applications. Additionally, the filter hook json_menus_format_menu_item allows for flexible data arrangement alterations, enhancing the plugin's usability. WP API Menus stands out as an essential tool for those looking to optimize their WordPress themes.