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Node.js socket.unref() Method

  • Last Updated : 26 Aug, 2020

The socket.unref() method is an inbuilt application programming interface of class Socket within dgram module which is used to allow the process to exit even if the socket is still listening.

Syntax:

const socket.unref()

Parameters: This method does not accept any parameters.

Return Value: This method returnsthe reference of the particular socket containing all the information in it.

Example 1: Filename: index.js




// Node.js program to demonstrate the
// server.unref() property
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Handling 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 unref() method
        const size = server.unref();
  
        // Display the result
        console.log(size.eventNames());
    });
  
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

Output:

[ 'message' ]
UDP String: Hello

Example 2: Filename: index.js




// Node.js program to demonstrate the
// server.unref() method
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Handling the message event
server.on("message", function (msg) {
  
    // Displaying the client message  
    process.stdout.write("UDP String: "
            + msg + "\n");
  
    // Exiting process 
    process.exit();
});
  
// Handling 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 unref() methods
    const size = server.unref();
  
    // Display the result
    console.log(size.eventNames());
});
  
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

Run the index.js file using the following command:

node index.js

Output:

server listening 0.0.0.0:1234
[ 'message', 'listening' ]
UDP String: Hello

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


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