Send image as base64 buffer from client (python opencv) to server (nodejs) using SocketIO

client.py

import cv2
import socketio #python-socketio by @miguelgrinberg
import base64

sio = socketio.Client()
sio.connect('http://x.x.x.x:xxxx)

cam = cv2.VideoCapture(0)

while (True):
  ret, frame = cam.read()                     # get frame from webcam
  res, frame = cv2.imencode('.jpg', frame)    # from image to binary buffer
  data = base64.b64encode(frame)              # convert to base64 format
  sio.emit('data', data)                      # send to server

cam.release()
  

server.js

var app = require('express')();
var http = require('http').createServer(app);
var io = require('socket.io')(http);
var sizeof = require('object-sizeof');

app.get('/', function (req, res) {
  res.send('running');
})

io.on('connection', function (socket) {
  socket.on('data', function (data) {                     // listen on client emit 'data'
    var ret = Object.assign({}, data, {
      frame: Buffer.from(data.frame, 'base64').toString() // from buffer to base64 string
    })
    io.emit('data', ret);                                 // emmit to socket
  })
})

http.listen(3000, function () {
  console.log('listening on *:3333');
})