Node.js socket.connect() Method - GeeksforGeeks

02 Jul, 2021
The socket.connect() method is an inbuilt application programming interface of class Socket within dgram module which is used to connect the particular server to a particular port and address.
Syntax:
const socket.connect(port[, address][, callback]) 
Parameters: This method accepts the following parameters:
port: This parameter holds the port number.
address: This parameter holds the server address information.
callback: This parameter holds the callback function for further operation.
Return Value: This method does not return any value.
Example 1: Filename: index.js
Javascript
// Node.js program to demonstrate the// server.connect() method // Importing dgram modulevar dgram = require('dgram'); // Creating and initializing client// and server socketvar client = dgram.createSocket("udp4");var server = dgram.createSocket("udp4"); // Catching the message eventserver.on("message", function (msg) {     // Displaying the client message    process.stdout.write("UDP String: " + msg + "\n");     // Exiting process    process.exit();})    // Binding server with port    .bind(1234, () => {         // Getting the address information        // for the server by using        // address method        const address = server.address()         // Display the result        console.log(address);     }); // Connecting the server with particular local host// and address by using connect() methodserver.connect(1234, "localhost", () => {    console.log("connected")}) // Client sending message to serverclient.send("Hello", 0, 7, 1234, "localhost");
Output:
{ address: '0.0.0.0', family: 'IPv4', port: 1234 }
connected
UDP String: Hello
Example 2: Filename: index.js
Javascript
// Node.js program to demonstrate the// server.connect() method // Importing dgram modulevar dgram = require('dgram'); // Creating and initializing client// and server socketvar client = dgram.createSocket("udp4");var server = dgram.createSocket("udp4"); // Catching the message eventserver.on("message", function (msg) {     // Displaying the client message    process.stdout.write("UDP String: " + msg + "\n");     // Exiting process    process.exit(); }); // Catching the listening eventserver.on('listening', () => {     // Getting address information for the server    const address = server.address();     // Display the result    console.log(`server listening        ${address.address}:${address.port}`); });  // Binding server with port address// by using bind() methodserver.bind(1234, () => {     // Adding a multicast address for others to join    server.addMembership('224.0.0.114'); });  // Connecting the server with particular local host// and address by using connect() methodserver.connect(1234, "localhost", () => {    console.log("connected")}) // Client sending message to serverclient.send("Hello", 0, 7, 1234, "localhost");
Output:
server listening 0.0.0.0:1234
connected
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_connect_port_address_callback
sagartomar9927
Node.js-Methods
Node.js
Web Technologies
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