const WebSocket = require('ws')
const wss = new WebSocket.Server({
    port: 8080
})

const now = () => {
    return new Date().getTime()
}

wss.on('connection', (ws) => {
    ws.on('message', function(data) {
        var msg=JSON.parse(data)
        msg.took=now() - msg.start
        ws.send(JSON.stringify(msg))
    })
})