HTTPS problem with SSL certificates in Node.js

Bypassing the HTTPS problem with SSL certificates in Node.js involves temporarily disabling certificate validation or using self-signed certificates for development or testing purposes. Here's a short description of the steps you can take:

const path = require('path');
const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const nodemailer = require('nodemailer');
const fs = require('fs');
const https = require('https');

const app = express();
const port = 3000;

app.use(express.static(__dirname + '/var/www/html'));
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

const options = {
    key: fs.readFileSync('/etc/letsencrypt/live/domaine.com/privkey.pem'),
    cert: fs.readFileSync('/etc/letsencrypt/live/domaine.com/cert.pem')
};
const corsOptions = {
    origin: ['https://domaine.com', 'https://www.domaine.com'],

};


app.use(cors(corsOptions));

app.use(function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "https://domaine.com, https://www.domaine.com");
    next();
});

app.get('/*', function (req, res) {
    res.sendFile(path.join(__dirname + '/var/www/html/index.html'));
});

app.use(bodyParser.json());

// Your send-email route here
app.post('/send-email', (req, res) => {
    const name = req.body.name;
    const email = req.body.email;
    const message = req.body.message;

    const transporter = nodemailer.createTransport({
        host: 'smtp.gmail.com',
        port: 465,
        secure: true,
        auth: {
            user: '[e-mail]', // Replace with your email address
            pass: 'motpasse' // Replace with your app password
        }
    });

    const mailOptions = {
        from: '[e-mail]',
        to: '[e-mail]', // Replace with recipient email address
        subject: 'Portfolio Message',
        text: `
      name: ${name}
      email: ${email}
      message: ${message}
    `
    };

    transporter.sendMail(mailOptions, (error, info) => {
        if (error) {
            console.log(error);
            res.status(500).send('Error sending email');
        } else {
            console.log('Email sent:', info.response);
            res.status(200).send('Email sent successfully');
        }
    });
});

const server = https.createServer(options, app).listen(port, () => {
    console.log(`Server listening at https://domaine.com:${port}`);
});