typescript-json-schema/test/programs/optionals/schema.json

typescript-json-schema generates JSON Schema files from your Typescript sources

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "required": [ "required" ],
    "properties": {
        "required": {
            "type": "number"
        },
        "optional": {
            "type": "number"
        }
    }
}