(Node.js) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Note: This example requires Chilkat v11.0.0 or greater.

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

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

    var http = new chilkat.Http();

    // We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
    var sslCert = new chilkat.Cert();
    success = http.GetServerCert("apple.com",443,sslCert);
    if (success == false) {
        console.log(http.LastErrorText);
        return;
    }

    var certChain = new chilkat.CertChain();
    success = sslCert.BuildCertChain(certChain);
    if (success == false) {
        console.log(sslCert.LastErrorText);
        return;
    }

    var cert = new chilkat.Cert();
    var i = 0;
    var numCerts = certChain.NumCerts;
    while (i < numCerts) {
        certChain.CertAt(i,cert);
        console.log("SubjectDN " + i + ": " + cert.SubjectDN);
        console.log("IssuerDN " + i + ": " + cert.IssuerDN);
        i = i+1;
    }

    // If the certificate chain reaches the root CA cert, then the last cert in the chain
    // is the root CA cert.
    if (certChain.ReachesRoot == true) {
        var caCert = new chilkat.Cert();
        certChain.CertAt(numCerts - 1,caCert);
        console.log("CA Root Cert: " + caCert.SubjectDN);
    }


}

chilkatExample();