epoberezkin/ajv

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://json-schema.org/draft/2020-12/meta/core",
  "$vocabulary": {
    "https://json-schema.org/draft/2020-12/vocab/core": true
  },
  "$dynamicAnchor": "meta",

  "title": "Core vocabulary meta-schema",
  "type": ["object", "boolean"],
  "properties": {
    "$id": {
      "$ref": "#/$defs/uriReferenceString",
      "$comment": "Non-empty fragments not allowed.",
      "pattern": "^[^#]*#?$"
    },
    "$schema": {"$ref": "#/$defs/uriString"},
    "$ref": {"$ref": "#/$defs/uriReferenceString"},
    "$anchor": {"$ref": "#/$defs/anchorString"},
    "$dynamicRef": {"$ref": "#/$defs/uriReferenceString"},
    "$dynamicAnchor": {"$ref": "#/$defs/anchorString"},
    "$vocabulary": {
      "type": "object",
      "propertyNames": {"$ref": "#/$defs/uriString"},
      "additionalProperties": {
        "type": "boolean"
      }
    },
    "$comment": {
      "type": "string"
    },
    "$defs": {
      "type": "object",
      "additionalProperties": {"$dynamicRef": "#meta"}
    }
  },
  "$defs": {
    "anchorString": {
      "type": "string",
      "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
    },
    "uriString": {
      "type": "string",
      "format": "uri"
    },
    "uriReferenceString": {
      "type": "string",
      "format": "uri-reference"
    }
  }
}