The socket.send() method is an inbuilt application programming interface of class Socket within dgram module which is used to send the message from one socket to another.
Syntax:
socket.send(msg[, offset, length][, port][, address][, callback])
Parameters: This method takes the following parameter:
- msg: Message to be sent.
- offset: Offset in the buffer where the message starts.
- length: Number of bytes in the message.
- port: Destination port.
- address: Destination hostname or IP address.
- callback: Called when the message has been sent.
Return Value: This method does not return any value.
Example 1: In this example, we will see the use of socket.send() Method
Filename: index.js
// Node.js program to demonstrate the
// server.send() 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 reference of the server
// by using ref() method
const size = server.ref();
// Display the result
console.log(size.eventNames());
});
// Client sending message to server
// by using send() method
client.send("Hello", 0, 7, 1234, "localhost");
Output:
[ 'message' ] UDP String: Hello
Example 2: In this example, we will see the use of a socket.send() Method
Filename: index.js
// Node.js program to demonstrate the
// server.send() 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, () => {
// Getting the reference of server
// by using ref() method
const size = server.ref();
// display the result
console.log(size.eventNames());
});
// Client sending message to server
// by using send() method
client.send("Hello", 0, 7, 1234, "localhost", (err) => {
if (err) throw err;
console.log("message sent");
});
Output:
server listening 0.0.0.0:1234 [ 'message', 'listening' ] message sent UDP String: Hello
Run the index.js file using the following command:
node index.js
