(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.

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-darwin-universal');
}

function chilkatExample() {

    // 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).
    // sslCert: Cert
    var sslCert = http.GetServerSslCert("nationalgeographic.com",443);
    if (http.LastMethodSuccess == false) {
        console.log(http.LastErrorText);
        return;
    }

    // Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
    // be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
    // will be returned.  The certificate chain's ReachesRoot property can be examined to 
    // see if the chain was completed to the root.
    // certChain: CertChain
    var certChain = sslCert.GetCertChain();
    if (sslCert.LastMethodSuccess == false) {
        console.log(sslCert.LastErrorText);

        return;
    }

    var i = 0;
    var numCerts = certChain.NumCerts;
    while (i < numCerts) {
        // cert: Cert
        var cert = certChain.GetCert(i);
        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) {
        // caCert: Cert
        var caCert = certChain.GetCert(numCerts - 1);
        console.log("CA Root Cert: " + caCert.SubjectDN);

    }


}

chilkatExample();