npm i socket.io
$ npm install socket.io
const express = require("express"); const http = require("http"); const socketIo = require("socket.io"); const port = process.env.PORT || 8001; const index = require("./routes/index"); const app = express(); app.use(index); const server = http.createServer(app); const io = socketIo(server); // < Interesting! const getApiAndEmit = "TODO";