ws-jsonrpc-client.js

var C = require("rpc-wsc")

var c = new C("ws://localhost:8080/rpc/1.0")

c.on("open", function() {
    c.call("funcme", "foo").then(function(result) {
        console.log(result)
        c.close()
    })
})

c.on("error", function(error) {
    console.log("error:", error)
})

c.on("close", function() {
    console.log("close")
})