Node.js socket.connect() Method
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: HelloExample 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
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