Using JSON:

The JSON format is an easily readable format in JavaScript. It is always good to transfer data in the JSON format.

Object-based structure for WebSockets:

Normally, in any application where we have to transfer different data sets, it is always preferred that we finalize a proper structure for the messages. Take the example of a chatting application: if we finalize a structure, it is better to handle the message. Here is a sample structure:

  {
    type: "message"
    data : {
      from: "varun"
      to : "user1"
      data : "hello"
           }
  }

Using ArrayBuffer:

There is another way to send data using ArrayBuffer; you can also send a Binary Large Object (BLOB). Here is an example of the same:

var array = new Float32Array(5);
  for(var i = 0; i < array.length; ++i) {
    array[i] = i / 2;
  }
  ws.send(array, { binary: true, mask: true });