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wbparsevalue returns an array of results, each possibly representing an error. The format looks like this:

{
    "results": [
        {
            "raw": "VALUE",
            "error": "ValueParsers\\ParseException",
            "error-info": "The provided id serialization \"VALUE\" is not valid",
            "expected-format": "entity-id",
            "messages": [
                {
                    "name": "wikibase-parse-error-entity-id",
                    "parameters": [],
                    "html": {
                        "*": "The entity id is malformed."
                    }
                }
            ]
        }
    ]
}

Convention would suggest the following format:

{
    "results": [
        {
            "raw": "VALUE",
            "error": {
                "code": "wikibase-parse-error"
                "info": "The provided id serialization \"VALUE\" is not valid"
                "messages": [
                    {
                        "name": "wikibase-parse-error-entity-id",
                        "parameters": [],
                        "html": {
                            "*": "The entity id is malformed."
                        }
                    }
                ]
            }
        }
    ]
}