Node.js socket.connect() Method
Last Updated :
06 Apr, 2023
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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: In this example, we will see the use of socket.connect() method
Filename: index.js
// Node.js program to demonstrate the
// server.connect() method
// Importing dgram module
const dgram = require('dgram');
// Creating and initializing client
// and server socket
let client = dgram.createSocket("udp4");
let server = dgram.createSocket("udp4");
// Catching the message event
server.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() method
server.connect(1234, "localhost", () => {
console.log("connected")
})
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
Output:
{ address: '0.0.0.0', family: 'IPv4', port: 1234 }
connected
UDP String: Hello
Example 2: In this example, we will see the use of socket.connect() method
Filename: index.js
// Node.js program to demonstrate the
// server.connect() method
// Importing dgram module
const dgram = require('dgram');
// Creating and initializing client
// and server socket
let client = dgram.createSocket("udp4");
let server = dgram.createSocket("udp4");
// Catching the message event
server.on("message", function (msg) {
// Displaying the client message
process.stdout.write("UDP String: " + msg + "\n");
// Exiting process
process.exit();
});
// Catching the listening event
server.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() method
server.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() method
server.connect(1234, "localhost", () => {
console.log("connected")
})
// Client sending message to server
client.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
