Node.js TLS SSL

Node.js TLS/SSL

TLS (Transport Layer Security) is the successor to SSL (Secure Sockets Layer). Together they provide cryptographic protocols that secure communication over the web ÔÇö encrypting data and verifying server identity at the TCP layer.

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Public-Key Cryptography

• Public Key: shared openly.
• Private Key: kept secret on the server.
• Encryption uses the public key; decryption uses the private key.
• This works even over untrusted networks like the public internet.

Accessing TLS in Node.js

const tls = require('tls');

Generate Keys with OpenSSL

# Generate private key
openssl genrsa -out server-key.pem 2048

# Create signing request
openssl req -new -key server-key.pem -out server-csr.pem

# Generate self-signed cert
openssl x509 -req -in server-csr.pem -signkey server-key.pem -out server-cert.pem

Simple TLS Client

const tls = require('tls');

const socket = tls.connect(443, 'www.google.com', () => {
  console.log('connected', socket.authorized ? 'authorized' : 'unauthorized');
  socket.write('GET / HTTP/1.0
Host: www.google.com

');
});

socket.on('data', (data) => console.log(data.toString()));
socket.on('error', (err) => console.error(err));
socket.on('close', () => console.log('closed'));

Simple TLS Server

const tls = require('tls');
const fs = require('fs');

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

tls.createServer(options, (socket) => {
  socket.write('Welcome to the secure server!
');
  socket.pipe(socket);
}).listen(8000);

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Conclusion

The Node.js tls module provides full TLS/SSL support for both servers and clients. Generate proper keys with OpenSSL, never disable certificate validation in production, and you have rock-solid encrypted communication. For more tutorials, stay tuned to .

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