Node.js - dnsPromises.resolveMx() Method

Node.jsServer Side ProgrammingProgramming

The dnsPromises.resolveMx() method uses the DNS protocol to resolve the mail exchange records (MX Records) for the hostname. The promise is resolved with an array of objects containing both a priority and exchange property on success.

Syntax

dnsPromises.resolveMx( hostname )

where, hostname is the parameter that takes the input for the hostname to be resolved.

Example 1

Create a file with the name "resolveMx.js" and copy the following code snippet. After creating the file, use the command "node resolveMx.js" to run this code as shown in the example below −

// dns.resolveMx() Demo Example

// Importing the dns module
const dns = require('dns');

const dnsPromises = dns.promises;

// Passing IP to find the hostname TXT records
dnsPromises.resolveMx('tutorialspoint.com').then((response) => {
   console.log("MX Records: ", response);
})

Output

C:\home\node>> node resolveMx.js
MX Records: [ { exchange: 'alt3.aspmx.l.google.com', priority: 10 },
   { exchange: 'alt2.aspmx.l.google.com', priority: 5 },
   { exchange: 'alt1.aspmx.l.google.com', priority: 5 },
   { exchange: 'aspmx.l.google.com', priority: 1 },
   { exchange: 'alt4.aspmx.l.google.com', priority: 10 } ]

Example 2

// dns.resolveMx() Demo Example

// Importing the dns module
const dns = require('dns');

const dnsPromises = dns.promises;

// Setting ttl as true
const options={
   ttl:true,
};

// Calling dnsPromises.resolveMx() method
// asynchronously
(async function() {

   const records = await dnsPromises.resolveMx('google.com', options);

   // Printing records
   console.log("MX Records: ", records);
})();

Output

C:\home\node>> node resolveMx.js
MX Records: [ { exchange: 'alt4.aspmx.l.google.com', priority: 50 },
   { exchange: 'aspmx.l.google.com', priority: 10 },
   { exchange: 'alt3.aspmx.l.google.com', priority: 40 },
   { exchange: 'alt1.aspmx.l.google.com', priority: 20 },
   { exchange: 'alt2.aspmx.l.google.com', priority: 30 } ]
raja
Published on 17-Jan-2022 12:42:48

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