Available as JSON files.
I've been slowly working away on DocGen, our tool for generating the new Phaser API documentation. It was built to bridge the issues between Phaser and Pixi jsdoc format incompatibilities and to take the API docs to the next stage. Tonight I got it to a point where it's outputting everything as json data.
The json files contain every method and property for every class, including all inherited ones, properly formatted return types, inline help, line numbers and everything else you should need.