TLS/SSL Module in Node.js

Last Updated : 21 Jul, 2026

The TLS/SSL module enables secure communication by encrypting data between clients and servers using TLS/SSL protocols.

  • Used to create secure servers and clients and commonly applied in HTTPS and other secure network applications.
  • Ensures encrypted data transmission over the network to protect sensitive information.
  • Supports certificate-based authentication for establishing secure connections.

Importing the Module

To use the TLS/SSL module in your Node.js application, import it as shown below:

const tls = require('tls');

Features of the Node.js TLS/SSL Module

  • Secure Communication: Encrypts data transmitted between clients and servers using TLS/SSL protocols.
  • Certificate Management: Supports digital certificates and certificate chains for trusted connections.
  • Configurable Security: Enables secure server/client connections with customizable protocols and cipher suites.

TLS/SSL Methods

The TLS/SSL module provides several methods for setting up secure connections and managing encryption.

  • tls.createServer(): method creates a new TLS server for handling secure encrypted connections.
  • tls.connect(): method establishes a secure connection to a TLS server as a client.
  • tls.createSecureContext(): creates a secure context with specified security parameters such as certificates & keys.
  • tls.checkServerIdentity(): verifies the server’s certificate to ensure the server’s identity during a secure connection.
  • tls.TLSSocket(): class creates a secure TLS socket used for encrypted communication between client and server.

Creating a Secure TLS Server

Create a simple TLS server that listens on a specific port and sends a response when a client connects, using self-signed certificates for secure communication.

Step1: Before running the server, you need to create SSL certificates. You can generate them using OpenSSL

openssl req -nodes -new -x509 -keyout key.pem -out cert.pem -day 365

Step2: Create a simple TLS server using the generated certificates:

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

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

const server = tls.createServer(options, (socket) => {
    socket.write('Welcome to the secure server!\n');
    socket.end();
});

server.listen(8000, () => {
    console.log('TLS server is running on port 8000');
});

Output:

TLS server is running on port 8000

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