node-mongodb Protection against websocket data loss

I am on the client side of a websocket API which uses SocketCluster for its pub/sub.

After authenticating I receive every second json data via

SCsocket.on('authenticate', function(){
   var channel = SCsocket.subscribe('channel1');
   channel.watch(function(data){
      console.log(data); 
   });
});

of the form

[
  {
      "product": "Product1",
      "price":   "10.0" 
  },
  {
      "product": "Product2",
      "price":   "15.0"  
  }
]

Instead of printing the data, I will save it to a mongo db.

In case some of the data cannot be uploaded, I need some sort of a safety net. Something that allows me to upload the data from the websocket to mongo db in retrospect.

What are best practices for doing that? I hope this question is not too broad, I am new to node and mongo db.

Thanks!