DNS Module In Node

In Node.js, The "DNS module" in Node.js provides functions to perform DNS "Domain Name System" lookups and resolve DNS-related tasks.

This module is particularly useful when working with networked applications that need to interact with domain names.

DNS Use Cases In Node.js:

Domain Verification: We can use DNS Modules `lookup` methods to verify our domain ownership.
Caching: We can cache resolved DNS records to increase performance and reduce the load on DNS servers.
Network Configuration: We can use DNS Module for configuring network-related services like load balancers or proxy servers.

Here's an overview of methods provided by the DNS module:

dns.lookup(hostname, callback):

Resolves a hostname (e.g., a domain name) into the first found IP address. It uses the operating system's DNS resolution mechanism.

Example:

const dns = require('dns');

dns.lookup('www.domainName.com', ( err, address, family ) => {
  // Handling Error
  if (err) throw err;
  console.log( `Fetch Address: ${address}, family: IPv${family}` );
});

Output:

Address: 71.71.12.103, family: IPv4

dns.resolve(hostname, callback):

Resolves a hostname into an array of records based on the specified record type `rrtype`. Common record types include 'A' (IPv4 addresses), 'AAAA' (IPv6 addresses), 'MX' (mail exchange), etc.

Example:

const dns = require('dns');

dns.resolve( 'www.domainName.com' , 'A', ( err, records ) => {
  // Handling Error
  if (err) throw err;
  console.log(' Fetch IPv4 records: ', records );
});

Output:

IPv4 addresses: [ '71.71.12.103' ]

dns.resolveTxt(hostname, callback)

Resolves the text `TXT` records of a hostname.

Example:

const dns = require('dns');

dns.resolveTxt( 'domainName.com', ( err, records ) => {
  // Handling Error
  if (err) throw err;
  console.log( 'DNS Txt Records: ' , records );
});

dns.resolveCname(hostname, callback):

Resolves the canonical name `CNAME` of a hostname.

Example:

const dns = require('dns');

dns.resolveCname( 'www.domainName.com' , ( err , records ) => {
  // Handling Error
  if (err) throw err;
  console.log( 'DNS CNAME Records Fetch: ', records );
});

dns.resolveNs(hostname, callback):

Resolves the name server `NS` records of a hostname.

Example:

const dns = require('dns');

dns.resolveNs( 'domainName.com' , ( err, records ) => {
  // Handling Error
  if (err) throw err;
  console.log( 'DNS NS Records Fetch: ', records );
});

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