How would I send and receive packets over a WebSocket in Javascript

Question

I want to send data from Javascript to a WebSocket server and also from a WebSocket server to Javascript.

I want to send this:

Headers
-------
Field 1: 2 byte hex
Field 2: 2 byte hex
Field 3: 4 byte hex

Data
----
Field1 : 2 byte hex
Field1 : 8 byte hex

From Javascript, I can send a two-byte value via

socket = new WebSocket(host);
...
socket.send(0xEF);

But I want to send multiple fields, together...let's say 0xEF, 0x60, and 0x0042.

How do I do this?

And, how to I interpret via Javascript data containing multiple fields coming from the WebSocket server?

Answer 1

You can send data as a string. For example:

socket.send("hello world");

I recommend you to use JSON as data format. You can convert JSON strings directly into objects and vice versa. It's so simple and useful!

Answer 2

You can send data as JSON objects.

 socket.send(JSON.stringify({field1:'0xEF', field2:'0x60',field3: '0x0042'}));