Node.js dnsPromises.resolveAny() Method

Last Updated : 13 Oct, 2021

The dnsPromises.resolveAny() method is an inbuilt application programming interface of the promises object of dns module which is used to resolve all records (i.e. 'ANY' or '*') for the specified hostname using DNS protocol. Syntax:

dnsPromises.resolveAny( hostname )

Parameters: This method accepts a single parameter as mentioned above and described below:

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

Return: This method returns error, records. Records that may be returned are among

A: IPv4 address
AAAA: IPv6 address
ANY: Any records
CNAME: canonical name records
MX: mail exchange records
NAPTR: name authority pointer records
NS: name server records
PTR: pointer records
SOA: start of authority records
SRV: service records
TXT: text records

Below examples illustrate the use of dnsPromises.resolveAny() method in Node.js: Example 1:

javascript

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

Output:

  for localhost :  [ { address: '127.0.0.1', ttl: 0, type: 'A' } ]  for geeksforgeeks :  [ { exchange: 'alt1.aspmx.l.google.com', priority: 5, type: 'MX' },    { exchange: 'alt2.aspmx.l.google.com', priority: 5, type: 'MX' },    { exchange: 'aspmx.l.google.com', priority: 1, type: 'MX' },    { exchange: 'alt3.aspmx.l.google.com', priority: 10, type: 'MX' },    { exchange: 'alt4.aspmx.l.google.com', priority: 10, type: 'MX' },    { value: 'ns-1520.awsdns-62.org', type: 'NS' },    { value: 'ns-1569.awsdns-04.co.uk', type: 'NS' },    { value: 'ns-245.awsdns-30.com', type: 'NS' },    { value: 'ns-869.awsdns-44.net', type: 'NS' },    { entries:       [ 'v=spf1 include:amazonses.com include:_spf.google.com -all' ],      type: 'TXT' },    { entries: [ 'fob1m1abcdp777bf2ncvnjm08n' ], type: 'TXT' },    { nsname: 'ns-869.awsdns-44.net',      hostmaster: 'awsdns-hostmaster.amazon.com',      serial: 1,      refresh: 7200,      retry: 900,      expire: 1209600,      minttl: 86400,      type: 'SOA' } ]

Example 2:

javascript

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

Output:

  from async:  [ { exchange: 'alt4.aspmx.l.google.com', priority: 10, type: 'MX' },    { exchange: 'alt1.aspmx.l.google.com', priority: 5, type: 'MX' },    { exchange: 'alt2.aspmx.l.google.com', priority: 5, type: 'MX' },    { exchange: 'aspmx.l.google.com', priority: 1, type: 'MX' },    { exchange: 'alt3.aspmx.l.google.com', priority: 10, type: 'MX' },    { value: 'ns-869.awsdns-44.net', type: 'NS' },    { value: 'ns-1520.awsdns-62.org', type: 'NS' },    { value: 'ns-245.awsdns-30.com', type: 'NS' },    { value: 'ns-1569.awsdns-04.co.uk', type: 'NS' },    { entries:       [ 'v=spf1 include:amazonses.com include:_spf.google.com -all' ],      type: 'TXT' },    { entries: [ 'fob1m1abcdp777bf2ncvnjm08n' ], type: 'TXT' },    { nsname: 'ns-869.awsdns-44.net',      hostmaster: 'awsdns-hostmaster.amazon.com',      serial: 1,      refresh: 7200,      retry: 900,      expire: 1209600,      minttl: 86400,      type: 'SOA' } ]

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

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