(JavaScript) Cloudfare DNS over HTTPS

Cloudflare offers a DNS over HTTPS resolver at: https://cloudflare-dns.com/dns-query

This example demonstrates how to do a DNS lookup for a domain using Cloudfare's HTTPS resolver.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var http = new CkHttp();

// Send the following CURL request:   curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A'

http.Accept = "application/dns-json";

var url = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A";

var jsonResp = http.QuickGetStr(url);
if (http.LastMethodSuccess !== true) {
    console.log(http.LastErrorText);
    return;
}

console.log("Response Status Code: " + http.LastStatus);

var json = new CkJsonObject();
json.Load(jsonResp);
json.EmitCompact = false;
console.log(json.Emit());

if (http.LastStatus !== 200) {
    console.log("Failed.");
    return;
}

// Sample output...
// (See the parsing code below..)
// 

// {
//   "Status": 0,
//   "TC": false,
//   "RD": true,
//   "RA": true,
//   "AD": false,
//   "CD": false,
//   "Question": [
//     {
//       "name": "chilkat.io.",
//       "type": 1
//     }
//   ],
//   "Answer": [
//     {
//       "name": "chilkat.io.",
//       "type": 1,
//       "TTL": 900,
//       "data": "52.25.83.238"
//     }
//   ]
// }

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

var Status;
var TC;
var RD;
var RA;
var AD;
var CD;
var i;
var count_i;
var name;
var type;
var TTL;
var data;
var ipAddr;

Status = json.IntOf("Status");
TC = json.BoolOf("TC");
RD = json.BoolOf("RD");
RA = json.BoolOf("RA");
AD = json.BoolOf("AD");
CD = json.BoolOf("CD");
i = 0;
count_i = json.SizeOfArray("Question");
while (i < count_i) {
    json.I = i;
    name = json.StringOf("Question[i].name");
    type = json.IntOf("Question[i].type");
    i = i+1;
}

i = 0;
count_i = json.SizeOfArray("Answer");
// The domain name resolves to 1 or more IP addresses..
while (i < count_i) {
    json.I = i;
    name = json.StringOf("Answer[i].name");
    type = json.IntOf("Answer[i].type");
    TTL = json.IntOf("Answer[i].TTL");
    ipAddr = json.StringOf("Answer[i].data");

    console.log("IP Address: " + ipAddr);
    i = i+1;
}