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Node.js socket.addMembership() Method
  • Last Updated : 09 Aug, 2020

The socket.addMembership() method is an inbuilt application programming interface of class Socket within dgram module which is used to make kernel join a multicast group at the particular multicast address.

Syntax:

const socket.addMembership(multicastAddress[, multicastInterface])

Parameters: This method takes the string representing the multicast address as a parameter.

Return Value: This method does not return any value.

Example 1: Filename: index.js



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// Node.js program to demonstrate the
// server.addMembership() method
  
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing clinet 
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Cathing the message event
server.on("message", function (msg) {
  
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
  
    // Exiting process
    process.exit();
})
    .bind(1234, () => {
  
        // Adding a multicast address for
        // others to join
        server.addMembership('224.0.0.114');
    });
  
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

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Output:

UDP String: Hello

Example 2: Filename: index.js

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// Node.js program to demonstrate the
// server.addMembership() method
  
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing clinet
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Cathing the message event
server.on("message", function (msg) {
  
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
  
    // Exiting process
    process.exit();
});
  
// Cathing the listening event
server.on('listening', () => {
    const address = server.address();
    console.log(`server listening 
        ${address.address}:${address.port}`);
});
  
// Binding server with port address
server.bind(1234, () => {
  
    // Adding a multicast address for others to join
    server.addMembership('224.0.0.114');
});
  
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

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Output:

server listening 0.0.0.0:1234
UDP String: Hello

Run the index.js file using the following command:

node index.js

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

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