React Native

DNS Query TXT Records

See more DNS Examples

Shows how to perform a DNS query to retrieve TXT 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('TXT', 'x.com', json);
  } catch {
    console.log(dns.lastErrorText);
    return;
  }

  console.log(json.emit());

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

  // {
  //   "answer": {
  //     "txt": [
  //       {
  //         "name": "x.com",
  //         "ttl": 300,
  //         "text": "kkdl3qb3tcrmdhfsm803p67r0my0svs8"
  //       },
  //       {
  //         "name": "x.com",
  //         "ttl": 300,
  //         "text": "v=spf1 ip4:199.16.156.128/26 ip4:199.59.150.64/26 include:_spf.google.com include:spf-008d0a01.pphosted.com -all"
  //       },
  //       {
  //         "name": "x.com",
  //         "ttl": 300,
  //         "text": "google-site-verification=8yQmoVhQedzlt36RPeQP41ytrEFk9aHEnde_xm0626g"
  //       },
  //       {
  //         "name": "x.com",
  //         "ttl": 300,
  //         "text": "google-site-verification=F6u9mGL--d2lbLljvH3b1UUgXtevQPdcamKr9c8914A"
  //       }
  //     ]
  //   }
  // }

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

  let name = '';
  let ttl = 0;
  let text = '';

  let i = 0;
  const countI = json.sizeOfArray('answer.txt');
  while (i < countI) {
    json.i = i;
    name = json.stringOf('answer.txt[i].name');
    ttl = json.intOf('answer.txt[i].ttl');
    text = json.stringOf('answer.txt[i].text');
    i++;
  }
}