JSON Schema Draft 2020-12 Meta-Schema

{
  "$id": "json-schema-meta.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "JSON Schema Draft 2020-12 Meta-Schema",
  "description": "Schema describing the structure of a JSON Schema document conforming to Draft 2020-12, the latest stable version of the JSON Schema specification used for validating JSON data.",
  "type": ["object", "boolean"],
  "if": {
    "type": "object"
  },
  "then": {
    "properties": {
      "$id": {
        "type": "string",
        "format": "uri-reference",
        "description": "Identifies the schema resource with a URI."
      },
      "$schema": {
        "type": "string",
        "format": "uri",
        "description": "Declares the JSON Schema dialect this schema conforms to.",
        "examples": [
          "https://json-schema.org/draft/2020-12/schema"
        ]
      },
      "$ref": {
        "type": "string",
        "format": "uri-reference",
        "description": "References another schema by URI."
      },
      "$defs": {
        "type": "object",
        "description": "An object containing schema definitions for reuse within this schema.",
        "additionalProperties": {
          "$ref": "#"
        }
      },
      "$anchor": {
        "type": "string",
        "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$",
        "description": "Creates a plain name anchor for referencing within the schema."
      },
      "$dynamicRef": {
        "type": "string",
        "format": "uri-reference",
        "description": "A dynamic reference resolved at evaluation time."
      },
      "$dynamicAnchor": {
        "type": "string",
        "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$",
        "description": "Creates a dynamic anchor that can be overridden by referencing schemas."
      },
      "$vocabulary": {
        "type": "object",
        "description": "Declares the vocabularies required and optional for this schema.",
        "propertyNames": {
          "type": "string",
          "format": "uri"
        },
        "additionalProperties": {
          "type": "boolean"
        }
      },
      "$comment": {
        "type": "string",
        "description": "A comment for schema maintainers, not used in validation."
      },
      "title": {
        "type": "string",
        "description": "A short summary of the schema's purpose."
      },
      "description": {
        "type": "string",
        "description": "A detailed explanation of the schema's purpose."
      },
      "default": {
        "description": "A default value for the instance."
      },
      "examples": {
        "type": "array",
        "description": "Example values conforming to this schema.",
        "items": true
      },
      "deprecated": {
        "type": "boolean",
        "description": "Indicates whether the schema is deprecated.",
        "default": false
      },
      "readOnly": {
        "type": "boolean",
        "description": "Indicates the value is managed by the owning authority and should not be modified.",
        "default": false
      },
      "writeOnly": {
        "type": "boolean",
        "description": "Indicates the value should never be visible in responses.",
        "default": false
      },
      "type": {
        "description": "The data type(s) allowed for the instance.",
        "oneOf": [
          {
            "type": "string",
            "enum": ["array", "boolean", "integer", "null", "number", "object", "string"]
          },
          {
            "type": "array",
            "items": {
              "type": "string",
              "enum": ["array", "boolean", "integer", "null", "number", "object", "string"]
            },
            "minItems": 1,
            "uniqueItems": true
          }
        ]
      },
      "enum": {
        "type": "array",
        "description": "The instance value must be equal to one of the elements in this array.",
        "items": true,
        "minItems": 1,
        "uniqueItems": true
      },
      "const": {
        "description": "The instance value must be equal to this value."
      },
      "allOf": {
        "type": "array",
        "description": "The instance must be valid against all of the subschemas.",
        "items": {
          "$ref": "#"
        },
        "minItems": 1
      },
      "anyOf": {
        "type": "array",
        "description": "The instance must be valid against at least one of the subschemas.",
        "items": {
          "$ref": "#"
        },
        "minItems": 1
      },
      "oneOf": {
        "type": "array",
        "description": "The instance must be valid against exactly one of the subschemas.",
        "items": {
          "$ref": "#"
        },
        "minItems": 1
      },
      "not": {
        "$ref": "#",
        "description": "The instance must not be valid against this schema."
      },
      "if": {
        "$ref": "#",
        "description": "The conditional schema to evaluate."
      },
      "then": {
        "$ref": "#",
        "description": "Applied when 'if' evaluates to true."
      },
      "else": {
        "$ref": "#",
        "description": "Applied when 'if' evaluates to false."
      },
      "properties": {
        "type": "object",
        "description": "Validation schemas for object properties by name.",
        "additionalProperties": {
          "$ref": "#"
        }
      },
      "patternProperties": {
        "type": "object",
        "description": "Validation schemas for properties matching regex patterns.",
        "additionalProperties": {
          "$ref": "#"
        },
        "propertyNames": {
          "format": "regex"
        }
      },
      "additionalProperties": {
        "$ref": "#",
        "description": "Schema for properties not matched by 'properties' or 'patternProperties'."
      },
      "propertyNames": {
        "$ref": "#",
        "description": "Schema that all property names must conform to."
      },
      "required": {
        "type": "array",
        "description": "Properties that must be present in the object.",
        "items": {
          "type": "string"
        },
        "uniqueItems": true
      },
      "dependentRequired": {
        "type": "object",
        "description": "Properties required when a given property is present.",
        "additionalProperties": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "uniqueItems": true
        }
      },
      "dependentSchemas": {
        "type": "object",
        "description": "Schemas applied when a given property is present.",
        "additionalProperties": {
          "$ref": "#"
        }
      },
      "minProperties": {
        "type": "integer",
        "minimum": 0,
        "description": "Minimum number of properties allowed.",
        "default": 0
      },
      "maxProperties": {
        "type": "integer",
        "minimum": 0,
        "description": "Maximum number of properties allowed."
      },
      "items": {
        "$ref": "#",
        "description": "Schema for validating array items."
      },
      "prefixItems": {
        "type": "array",
        "description": "Schemas for validating array items by position (tuple validation).",
        "items": {
          "$ref": "#"
        }
      },
      "contains": {
        "$ref": "#",
        "description": "Schema that at least one array item must match."
      },
      "minItems": {
        "type": "integer",
        "minimum": 0,
        "description": "Minimum number of items in an array.",
        "default": 0
      },
      "maxItems": {
        "type": "integer",
        "minimum": 0,
        "description": "Maximum number of items in an array."
      },
      "minContains": {
        "type": "integer",
        "minimum": 0,
        "description": "Minimum number of items matching 'contains'.",
        "default": 1
      },
      "maxContains": {
        "type": "integer",
        "minimum": 0,
        "description": "Maximum number of items matching 'contains'."
      },
      "uniqueItems": {
        "type": "boolean",
        "description": "Whether all items in the array must be unique.",
        "default": false
      },
      "minimum": {
        "type": "number",
        "description": "Minimum numeric value (inclusive)."
      },
      "exclusiveMinimum": {
        "type": "number",
        "description": "Minimum numeric value (exclusive)."
      },
      "maximum": {
        "type": "number",
        "description": "Maximum numeric value (inclusive)."
      },
      "exclusiveMaximum": {
        "type": "number",
        "description": "Maximum numeric value (exclusive)."
      },
      "multipleOf": {
        "type": "number",
        "exclusiveMinimum": 0,
        "description": "The numeric value must be a multiple of this number."
      },
      "minLength": {
        "type": "integer",
        "minimum": 0,
        "description": "Minimum string length.",
        "default": 0
      },
      "maxLength": {
        "type": "integer",
        "minimum": 0,
        "description": "Maximum string length."
      },
      "pattern": {
        "type": "string",
        "format": "regex",
        "description": "Regex pattern the string must match."
      },
      "format": {
        "type": "string",
        "description": "Semantic format identifier for string validation.",
        "examples": [
          "date-time",
          "date",
          "time",
          "email",
          "uri",
          "uuid",
          "ipv4",
          "ipv6"
        ]
      },
      "contentMediaType": {
        "type": "string",
        "description": "MIME type of the string content."
      },
      "contentEncoding": {
        "type": "string",
        "description": "Encoding of the string content (e.g., base64)."
      },
      "contentSchema": {
        "$ref": "#",
        "description": "Schema for the decoded content."
      },
      "unevaluatedItems": {
        "$ref": "#",
        "description": "Schema for array items not evaluated by other keywords."
      },
      "unevaluatedProperties": {
        "$ref": "#",
        "description": "Schema for object properties not evaluated by other keywords."
      }
    },
    "additionalProperties": true
  }
}