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Node.js - dnsPromises.resolveMx() Method
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
ode>> 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
ode>> 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 } ]
Updated on: 17-Jan-2022
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