Beast.WebSocket:

Beast.WebSocket provides developers with a robust WebSocket
implementation built on Boost.Asio with a consistent asynchronous
model using a modern C++ approach.

test/ripple-websocket.js

@@ -0,0 +1,23 @@
+// npm install ws
+// WS_ADDRESS=127.0.0.1:6006 node ripple-websocket.js
+
+var WebSocket = require('ws')
+
+console.log(process.env.WS_ADDRESS)
+var ws = new WebSocket('ws://'+process.env.WS_ADDRESS)
+
+ws.on('error', function(error){
+  console.log(error)
+})
+
+ws.on('open', function () {
+  ws.send(JSON.stringify({
+    "id": 1,
+    "command": "server_info"
+  }))
+})
+
+ws.on('message', function(dataString, flags) {
+  var data = JSON.parse(dataString)
+  console.log(data)
+})