js WebSocket simple test - NaClYen/blog GitHub Wiki
const ws = new WebSocket("ws://your.server:4567") // or new WebSocket("wss://your.host.name")
ws.onopen = () => console.log('open')
ws.onclose = () => console.log('close')
ws.onmessage = (e) => console.log(`message: ${e.data}`)
ws.send('Hi') // send text
ws.send(JSON.stringify({name: "NaCl", age: 18})) // send json object string