slate/examples/forced-layout/value.json

{
  "document": {
    "nodes": [
      {
        "object": "block",
        "type": "title",
        "nodes": [
          {
            "object": "text",
            "leaves": [
              {
                "text": "Enforce Your Layout!"
              }
            ]
          }
        ]
      },
      {
        "object": "block",
        "type": "paragraph",
        "nodes": [
          {
            "object": "text",
            "leaves": [
              {
                "text":
                  "This example shows how to enforce your layout with schema-specific rules. This document will always have a title block at the top and at least one paragraph in the body. Try deleting them and see what happens!"
              }
            ]
          }
        ]
      }
    ]
  }
}