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To implement SSL with a Node.js Express server, follow these steps:

1. Generate a SSL certificate and private key. You can either get a certificate from a trusted third-party provider or create a self-signed certificate.

2. Install the SSL certificate and private key on your web server.

3. Create an HTTPS server in your Node.js Express application using the https.createServer() method.

4. Configure the HTTPS server with the SSL certificate and private key.

5. Bind the server to a network interface and a port using the server.listen() method.

Here’s an example of how to create an HTTPS server with a self-signed SSL certificate:

const fs = require('fs');
const https = require('https');
const express = require('express');

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

const options = {
  key: fs.readFileSync('key.pem'),
  cert: fs.readFileSync('cert.pem')
};

https.createServer(options, app).listen(port, () => {
  console.log(`Server listening on port ${port}`);
});

In this example, we are creating an HTTPS server with the https.createServer() method and passing in the SSL certificate and private key as options. We then bind the server to the specified port and start listening for incoming HTTPS connections using the server.listen() method.