Node.js dnsPromises.lookupService() Method

// Node.js program to demonstrate the   
// dnsPromises.lookupService() method

// Accessing promises object from dns module
const dns = require('dns');
const dnsPromises = dns.promises;
 
// Calling dnsPromises.lookupService() method
// for 127.0.0.1 port  number 22
dnsPromises.lookupService('127.0.0.1', 22).then((res) => {
    console.log(res.hostname, res.service);
});

// Node.js program to demonstrate the   
// dnsPromises.lookupService() method

// Accessing promises object from dns module
const dns = require('dns');
const dnsPromises = dns.promises;;
 
// Setting options for dnsPromises.lookup() method
const options = {
    
    // Setting family as 4 i.e. IPv4
    family: 4,
    hints: dns.ADDRCONFIG | dns.V4MAPPED,
};
 
dnsPromises.lookup('geeksforgeeks.org', options).then((response) => {
    if(response){
        console.log(response);
        
        // Calling dnsPromises.lookupService() method 
        dnsPromises.lookupService(response.address, 80).then((res) => {
            console.log(res.hostname, res.service);
        });
    }
});