Node.jsでpy実行時に文字化けしてしまう問題

参考URL

文字化け解消のコード

js

const express = require('express');
const bodyParser = require('body-parser');
const { spawn } = require('child_process');
const app = express();
const cors = require('cors');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cors());

app.get('/', (req, res) => {
  res.sendFile(`${__dirname}/index.html`);
});
app.post('/python', (req, res) => {
  const message = req.body.message;
  console.log(message);
  let dataToSend;
  //ファイルをコマンドで実行するのと同じ
  const python = spawn('python3', ['./main.py', message], {
    env: { PYTHONIOENCODING: 'cp65001' },//ここで文字コードの指定
  });

  python.stdout.on('data', function (data) {
    console.log('Pipe data from python script ...');
    dataToSend = data.toString();
  });
  python.stderr.on('data', (data) => {
    console.log(`stderr: ${data}`);
  });
  python.on('exit', (code) => {
    console.log(`Child exited with code ${code}, ${dataToSend}`);
    res.json({ data: dataToSend });
  });
});
app.listen(3000, () => console.log('Server started on port 3000'));