Json schema max min code example

Example: json schema vocabulary

{
    "type": "string",
    "contentMediaType": "application/jwt",
    "contentSchema": {
        "type": "array",
        "minItems": 2,
        "items": [
            {
                "const": {
                    "typ": "JWT",
                    "alg": "HS256"
                }
            },
            {
                "type": "object",
                "required": ["iss", "exp"],
                "properties": {
                    "iss": {"type": "string"},
                    "exp": {"type": "integer"}
                }
            }
        ]
    }
}