Phaser - how to select a layer in a Tiled map as a collision layer

[maowor]

Hi, I'm quite new to using Phaser and the Tiled map editor and I'm currently making a platformer game using a Tiled map I made. I haven't been able to find any information in the Tiled or Phaser documentation, or in tutorials or forums on how to select a layer in my Tiled map to be a collision layer.

 

I have 3 layers plus one layer for objects. I've put all the tiles I want the player to be able to collide with such as the ground and platforms in one layer. I've read answers saying that you need to include the index of the collision tiles but I don't want to include individual tiles as there a lot of tiles used. I've seen Phaser/Tiled tutorials showing a layer as having collision set to true but I can't find information in the Tiled documentation on how to do this. Below is a screenshot of my Tiled map JSON file, the layer I want to make a collision layer is called "Tile Layer 2". I'm not sure if I need to mention this layer name in my Phaser code to make it a collision layer or if I need to somehow set the layer to collision: true in Tiled.

 

I'd really appreciate any suggestions on how to make this a collision layer. Thanks.