Sample JSON Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Comment describing your JSON Schema",
  "type": "object",
  "properties": {
    "EntityType": {
      "type": "string",
      "enum": [
        "fish",
        "car"
      ]
    }
  },
  "required": [
    "EntityType"
  ],
  "if": {
    "type": "object",
    "properties": {
      "EntityType": {
        "type": "string",
        "enum": [
          "fish"
        ]
      }
    },
    "required": [
      "EntityType"
    ]
  },
  "then": {
    "type": "object",
    "properties": {
      "Fish": {
        "type": "object",
        "properties": {
          "Name": {
            "type": "string"
          },
          "Species": {
            "type": "string"
          }
        },
        "required": [
          "Name",
          "Species"
        ],
        "additionalProperties": false
      }
    },
    "required": [
      "Fish"
    ]
  },
  "else": {
    "type": "object",
    "properties": {
      "Car": {
        "type": "object",
        "properties": {
          "Make": {
            "type": "string"
          },
          "Model": {
            "type": "string"
          },
          "Year": {
            "type": "integer",
            "minimum": 1900,
            "maximum": 2999
          }
        },
        "required": [
          "Make",
          "Model",
          "Year"
        ],
        "additionalProperties": false
      }
    },
    "required": [
      "Car"
    ]
  }
}