React Native

DNS Query SOA Records

See more DNS Examples

Shows how to perform a DNS query to retrieve SOA records.

Note: This example requires Chilkat v9.5.0.96 or later.

React Native

import { Dns, JsonObject } from '@chilkat/react-native'

async function chilkatExample() {
  const dns = new Dns();

  const json = new JsonObject();
  json.emitCompact = false;

  try {
    await dns.queryAsync('SOA', 'x.com', json);
  } catch {
    console.log(dns.lastErrorText);
    return;
  }

  console.log(json.emit());

  // Sample response.
  // Parsing code below..

  // {
  //   "answer": {
  //     "soa": [
  //       {
  //         "name": "x.com",
  //         "ttl": 1800,
  //         "mname": "alexia.ns.cloudflare.com",
  //         "rname": "dns.cloudflare.com",
  //         "serial": -1971124188,
  //         "refresh": 10000,
  //         "retry": 2400,
  //         "expire": 604800,
  //         "minttl": 1800
  //       }
  //     ]
  //   }
  // }

  // Use this online tool to generate parsing code from sample JSON: 
  // Generate Parsing Code from JSON

  let name = '';
  let ttl = 0;
  let mname = '';
  let rname = '';
  let serial = 0;
  let refresh = 0;
  let retry = 0;
  let expire = 0;
  let minttl = 0;

  let i = 0;
  const countI = json.sizeOfArray('answer.soa');
  while (i < countI) {
    json.i = i;
    name = json.stringOf('answer.soa[i].name');
    ttl = json.intOf('answer.soa[i].ttl');
    mname = json.stringOf('answer.soa[i].mname');
    rname = json.stringOf('answer.soa[i].rname');
    serial = json.intOf('answer.soa[i].serial');
    refresh = json.intOf('answer.soa[i].refresh');
    retry = json.intOf('answer.soa[i].retry');
    expire = json.intOf('answer.soa[i].expire');
    minttl = json.intOf('answer.soa[i].minttl');
    i++;
  }
}