schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "description": {
      "type": "string"
    },
    "owner": {
      "type": "object",
      "properties": {
        "username": {
          "type": "string"
        }
      },
      "required": ["username"],
      "additionalProperties": {
        "type": "string"
      }
    },
    "record": {
      "type": "object",
      "properties": {
        "ALIAS": {
          "type": "string"
        },
        "A": {
          "type": "array",
          "items": {
            "type": "string",
            "format": "ipv4"
          }
        },
        "AAAA": {
          "type": "array",
          "items": {
            "type": "string",
            "format": "ipv6"
          }
        },
        "CNAME": {
          "type": "string"
        },
        "MX": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "TXT": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "required": [],
      "anyOf": [
        { "required": ["ALIAS"] },
        { "required": ["A"] },
        { "required": ["AAAA"] },
        { "required": ["CNAME"] },
        { "required": ["MX"] },
        { "required": ["TXT"] },
        { "required": ["SRV"] }
      ]
    },
    "proxied": {
      "type": "boolean"
    }
  },
  "required": ["owner", "record"]
}