# layer


[API catalog](/reference/api/) · [Docker Hub overview](/reference/api/hub/latest/) · [Product manual](https://docs.docker.com/docker-hub/) · [OpenAPI specification](/reference/api/hub/latest.yaml)

API version: 2-beta



Schema constraints and annotations:

```json
{
  "properties": {
    "digest": {
      "description": "image layer digest",
      "type": [
        "string",
        "null"
      ]
    },
    "instruction": {
      "description": "Dockerfile instruction",
      "type": "string"
    },
    "size": {
      "description": "size of the layer",
      "type": "integer"
    }
  },
  "type": "object"
}
```