Pass data from client to server. Express - node.js

Question

i'm little stuck on my express application.
I have a file index.js in routes folder and I want to save the result of mydata
var express = require('express');
var router = express.Router();
router.get('/', token, function(req, res, next) {
var mydata = req.userId
res.render('index', {
title: 'Welcolme',
});
});
module.exports = router;
And, in my other file (which depends on app.js), I would like to get and pass mydata to the server
var app = require('../app');
server.listen(port, function () {
require('../assets/js/server/socket')(server, mydata);
});
(Here is my app.js)
var express = require('express');
var indexRouter = require('./routes/index');
var path = require('path');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'twig');
app.use('/', indexRouter);
module.exports = app;
And the socket file
var io = {};
module.exports = (server, mydata) => {
console.log('Hello : ' , mydata)
io = require('socket.io')(server);
io.on('connection', (socket) => {
console.log('Connected')
});
};
Is there a way to do that?
Thank you :)

Answer 1

Maybe instead of still having this route.get('/') ...
You can let the user enter the data and have it transferred directly through the WebSocket connection.
Example:
//Client-side
//Get the user data somewhere from the HTML page
const userData = document.getElementbyId("some html element's id here").innerHTML;
//Send it to the back end
socket.emit('userData',userData)
//Open a listener to get the data from the back end later
socket.on('processedData',processedData=>{
//Use it in the way you desired.
});
//Server-side
io.on('connection', (socket) => {
console.log('Connected')
socket.on('userData',userData=>{
//Do something here, like validation and stuff
socket.emit('processedData','processedData here')
});
});