Node.js server.address() Method

The server.address() is an inbuilt application programming interface of class Socket within tls module which is used to get the bound address of the server.

Syntax:

const server.address()

Parameters: This method does not accept any parameter.

Return Value: This method returns the bound address containing the family name, and port of the server.

How to generate private keys and public certificates?

Private key: Open Notepad and copy and paste the following key:

Save the file as a private key.pem

Public certificate: Open Notepad and copy and paste the following key:

Save the file as public-cert.pem

Example 1: Filename: index.js

Javascript

// Node.js program to demonstrate the
// server.address() method
 
const tls = require('tls'),
    fs = require('fs'),
 
    // Port and host address for server    
    PORT = 1337,
    HOST = '127.0.0.1',
    value = "";
 
// Private key and public certificate for access
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
 
// Creating and initializing server
const server = tls.createServer(options, function (socket) {
 
    // Print the data that we received
    socket.on("data", function (data) {
        console.log('\nReceived: %s ',
            data.toString().replace(/(\n)/gm, ""));
    });
 
});
 
// Start listening on a specific port and address
server.listen(PORT, HOST, function () {
    console.log("I'm listening at %s, on port %s", HOST, PORT);
});
 
// When an error occurs, show it.
server.on("error", function (error) {
 
    console.error(error);
    // Close the connection after the error occurred.
    // server.destroy();
 
});
 
server.on("end", () => {
    server.end();
    // server.destroy();
})
 
// Creating and initializing client
const client = tls.connect(PORT,
    HOST, options, function () {
 
        // Check if the authorization worked
        if (client.authorized) {
            console.log("Connection authorized by"
                + " a Certificate Authority.");
        } else {
            console.log("Connection not authorized: "
                + client.authorizationError)
        }
 
        // Send a friendly message
        client.write("Bound address : " + value);
        client.end();
    });
 
// Getting the bound address
// by using address method
value = client.address();
 
// console.log("Bound address : " + value)
 
client.on("close", function () {
    console.log("Connection closed");
});
 
// When an error occurs, show it.
client.on("error", function (error) {
 
    console.error(error);
    // Close the connection after the error occurred.
    client.destroy();
 
});

Output:

I'm listening at 127.0.0.1, on port 1337
Connection not authorized: DEPTH_ZERO_SELF_SIGNED_CERT

Received: Bound address : [object Object]
Connection closed

Example 2: Filename: index.js

Javascript

// Node.js program to demonstrate the
// server.address() method
 
const tls = require('tls'),
    fs = require('fs'),
 
    // Port and host address for server    
    PORT = 1337,
    HOST = '127.0.0.1';
 
// Private key and public certificate for access
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
 
// Creating and initializing server
const server = tls.createServer(options, function (socket) {
 
    // Print the data that we received
    socket.on('data', function (data) {
        console.log('\nReceived: %s ',
            data.toString().replace(/(\n)/gm, ""));
    });
});
 
 
// Start listening on a specific port and address
server.listen(PORT, HOST, function () {
    console.log("I'm listening at %s, "
        + "on port %s", HOST, PORT);
});
 
// Creating and initializing client
const client = tls.connect(PORT,
    HOST, options, function () {
 
        // Getting the bound address
        // by using address method
        const value = client.address();
        client.write("Bound address : " + value)
 
        client.end();
    });

Run the index.js file using the following command:

node index.js

Output:

I'm listening at 127.0.0.1, on port 1337

Received: Bound address : [object Object]

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_server_address

Javascript

Javascript

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