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Node.js dnsPromises.resolveSoa() Method
Last Updated :
13 Oct, 2021
The
dnsPromises.resolveSoa() method is an inbuilt application programming interface of the promises object of dns module which is used to resolve SOA or start of authority records for the specified hostname using DNS protocol.
Syntax:
dnsPromises.resolveSoa( 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. The address parameter will contain nsname, hostmaster, serial, refresh, retry, expire and minttl properties.
Below examples illustrate the use of
dnsPromises.resolveSoa() method in Node.js:
Example 1:
javascript
// Node.js program to demonstrate the
// dnsPromises.resolveSoa() method
// Accessing promises object from dns module
const dns = require('dns');
const dnsPromises = dns.promises;
// Calling dnsPromises.resolveSoa() method
dnsPromises.resolveSoa('google.com').then((res) => {
console.log("for google : ");
console.log(res);
});
for google :
{ nsname: 'ns1.google.com',
hostmaster: 'dns-admin.google.com',
serial: 290031082,
refresh: 900,
retry: 900,
expire: 1800,
minttl: 60
}
Example 2:
javascript
// Node.js program to demonstrate the
// dnsPromises.resolveSoa() method
// Accessing promises object from dns module
const dns = require('dns');
const dnsPromises = dns.promises;
// Calling dnsPromises.resolveSoa() method
// asynchronously
(async function() {
// Records from resolveSoa function
const records = await dnsPromises.resolveSoa(
'geeksforgeeks.org');
// Printing records
console.log("from async: ");
console.log(records);
})();
from async:
{ nsname: 'ns-869.awsdns-44.net',
hostmaster: 'awsdns-hostmaster.amazon.com',
serial: 1,
refresh: 7200,
retry: 900,
expire: 1209600,
minttl: 86400
}
Note: The above program will compile and run by using the
node index.js command.
Reference: https://nodejs.org/api/dns.html#dns_dnspromises_resolvesoa_hostname
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