Layers are collections of items, such as shapes, lines, or groups. Layers cannot contain other layers. They are similar to Groups but are more versatile. Layers are used to organize and manage the visual hierarchy of elements within a diagram. You can assign shapes, lines, and groups to different layers and then manipulate the visibility and order of those layers.

Layer Format

Property	Description
`id`	ID Identifier for a given layer (must be unique).	Required
`title`	String Title of the layer.	Required
`items`	Array[ID] An array of IDs of all Shapes, Lines, and Groups in the layer.	Optional
`note`	Text Text to add as a note to the layer.	Optional
`customData`	Array [Custom Data ] An array of custom data in the layer. See Custom Data for a description of its purpose.	Optional
`linkedData`	Array [Linked Data ] An array of linked data in the layer. See Linked Data for a description of its purpose.	Optional
`layerIndex`	Integer Defines the ordering between different layers. The order of items in the layer is based on the zIndex of each item within the layer. Items are first organized into a layer, then by zIndex, so layerIndex supersedes zIndex. Multiple layers with the same layerIndex will have the last layer of the JSON be on top. Defaults to 0	Optional

{
  "id": "layer1",
  "title": "New Layer",
  "items": [ ... ],
  "note": "Test Note",
  "customData": [ ... ],
  "linkedData": [ ... ],
  "layerIndex": 0
}