How can I be sure that socket request reached to my server?

Question

I have the following code and each time that I send request to API, I want to make sure that my socket request reached the server successfully but I don't want to handle this on server side and I want to do it right in this file. is there a way for doing that and show the connection status with API? I want to handle it in both /api route and sendPrint event

const express = require("express");
const Joi = require("joi");
const app = express();

const io = require("socket.io-client");

const socket = io("socket_server_url", {
  reconnectionDelayMax: 10000,
});

app.use(express.json());

let userIsConnected = false;

app.get("/api", (req, res) => {
  const { client_id, printer_id, url } = req.query;
  console.log(req.query);

  if (userIsConnected) {
    res.send("Connection succeed ");
  } else {
    res.send("Failed to connect to the server!");
  }

  const captcha = [clinet_id, printer_id, url];

  socket.emit("sendPrint", captcha);
});

app.get("/send", (req, res) => {
  res.send("send");
});

socket.on("connect", () => {
  userIsConnected = true;
});

socket.off("sendPrint");
socket.on("sendPrint", (roomInfo) => {
  console.log("Send Print Successful");
});

socket.on("disconnect", function () {
  userIsConnected = false;
});

const port = process.env.PORT || 7878;
app.listen(port, () => console.log(`Listening on port ${port}..`));