(Node.js) 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.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var http = new chilkat.Http();

    // 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 chilkat.JsonObject();
    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;
    }


}

chilkatExample();