How to make Express routes on a server with socket.io?

Question

Node.js

Connected socket.io to Express base server.

const express = require('express')
const app = express()
const server = require('http').createServer(app)
const io = require('socket.io')(server)

io.on('connection', socket => {
  ...
})

server.listen(9090)

Previously, I did not use the module httpwith Express and it is not entirely clear how I can now have regular routes in this configuration, likeserver.get('/hello')

Answer 1

Just:
app.get('/hello', () => {...});