deleteObjects

<script>
    var text = '{"invideoPromotion":{"items":[{"id":{"type":"video","videoId":"11","websiteUrl":""},"timing":{"type":"ms","offsetMs":"2222"},"customMessage":"aa","promotedByContentOwner":"vanji"}]}}'
    var obj = JSON.parse(text);
     document.writeln(JSON.stringify(obj));
    
    for (var i = 0; i < obj.invideoPromotion.items.length; i++) {
        if (obj.invideoPromotion.items[i].id.type == 'video') {
            if (obj.invideoPromotion.items[i].id.websiteUrl == '') {
                delete obj.invideoPromotion.items[i].id.websiteUrl;
            }
        }
    }
    document.writeln(JSON.stringify(obj));
</script>