submit-social-housing-lettings-and-sales-data/config/forms/schema/test.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "$id": "https://example.com/product.schema.json",
  "title": "Form",
  "description": "A form",
  "type": "object",
  "required": ["form_type", "start_year", "end_year", "sections"],
  "properties": {
    "form_type": {
      "description": "",
      "type": "string"
    },
    "start_year": {
      "description": "",
      "type": "integer"
    },
    "end_year": {
      "description": "",
      "type": "integer"
    },
    "sections": {
      "type": "object",
      "patternProperties": {
        "[a-z_\/#]+": {
          "description": "",
          "type": "object",
          "properties": {
            "label": {
              "description": "",
              "type": "string"  
            },
            "subsections": {  
              "type": "object",
              "patternProperties": {
                "[a-z_\/#]+": {
                  "description": "",
                  "type": "object",
                  "required": ["label"],
                  "properties": {
                    "label": {
                      "description": "",
                      "type": "string"
                    }
                  },
                  "minProperties": 1
                }
              }          
            }
          },      
          "minProperties": 2
        }
      },
      "minProperties": 1
    }
  }
}