Node.js dnsPromises.resolveNs() Method

Last Updated : 13 Oct, 2021

The dnsPromises.resolveNs() method is an inbuilt application programming interface of the Promises object of dns module which is used to resolve NS or name server records for the specified hostname using DNS protocol. Syntax:

dnsPromises.resolveNs( hostname )

Parameters: This method has one parameter as mentioned above and described below:

hostname: this parameter specifies a string which denotes the hostname to be resolved.

Return Value: This method returns error, addresses. Below examples illustrate the use of dnsPromises.resolveNs() method in Node.js: Example 1:

javascript

// Node.js program to demonstrate the  // dnsPromises.resolveNs() method // Accessing promises object from dns module const dns = require('dns'); const dnsPromises = dns.promises;   // Calling dnsPromises.resolveNs() method  dnsPromises.resolveNs('google.com').then((res) => {  console.log("for google : ");  console.log(res); });

Output:

 for google : [ 'ns2.google.com', 'ns3.google.com', 'ns4.google.com', 'ns1.google.com' ]

Example 2:

javascript

// Node.js program to demonstrate the  // dnsPromises.resolveNs() method // Accessing promises object from dns module const dns = require('dns'); const dnsPromises = dns.promises;   // Calling dnsPromises.resolveNs() method  // asynchronously  (async function() {    // Records from resolveNs function  const records = await dnsPromises.resolveNs(  'geeksforgeeks.org');    // Printing records  console.log("from async: ");  console.log(records);  })();

Output:

 from async: [ 'ns-1520.awsdns-62.org', 'ns-869.awsdns-44.net', 'ns-245.awsdns-30.com', 'ns-1569.awsdns-04.co.uk' ]

Note: The above program will compile and run by using the node index.js command. Reference: https://nodejs.org/api/dns.html#dns_dnspromises_resolvens_hostname