A function that deletes empty object properties (null or undefined) and also deletes empty objects recursively.

clearEmpties

function clearEmpties(o) {
    for (const k in o) {
        if (o[k] == null) {
            delete o[k];
            continue;
        }
        if (typeof o[k] !== 'object') {
            continue;
        }

        clearEmpties(o[k]);
        if (Object.keys(o[k]).length === 0) {
            delete o[k];
        }
    }
}