{
    "error": {
        "code": "wikilambda-zerror",
        "info": "Error of type Z554",
        "message": "Label for a given language clashes with another Object's label",
        "zerror": {
           ...
        },
        "labelled": {
           ...
        }
    }
}

{
    "xhr": {
        "readyState": 4,
        "responseText": "{\"error\":{\"code\":\"wikilambda-zerror\",\"info\":\"Error of type Z554\",\"message\":\"Label for a given language clashes with another Object's label\",\"zerror\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z554\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z554\"},\"K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"Z10000\"},\"K2\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"Z1002\"}}},\"labelled\":{\"type\":\"Error\",\"error type\":\"Label for a given language clashes with another Object's label\",\"error value\":{\"type\":{\"type\":\"Function call\",\"function\":\"Errortype to type\",\"errortype\":\"Label for a given language clashes with another Object's label\"},\"clashing ZID\":{\"type\":\"String\",\"value\":\"Date\"},\"language\":{\"type\":\"String\",\"value\":\"English\"}}},\"*\":\"See http://localhost:8080/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/postorius/lists/mediawiki-api-announce.lists.wikimedia.org/> for notice of API deprecations and breaking changes.\"},\"servedby\":\"49744f6ca153\"}",
        "responseJSON": {
            "error": {
                "code": "wikilambda-zerror",
                "info": "Error of type Z554",
                "message": "Label for a given language clashes with another Object's label",
                "zerror": {},
                "labeled": {}
            }
        }
    }
}