create-phaser-app/src/assets/levels/raw/level-0/input-tiles.json

A boiler plate to start your phaser app with webpack4, babel7+ and Phaser 3

{ "columns":4,
 "image":"input-tiles.png",
 "imageheight":48,
 "imagewidth":64,
 "margin":0,
 "name":"input-tiles",
 "spacing":0,
 "tilecount":12,
 "tileheight":16,
 "tilewidth":16,
 "type":"tileset"
}