(Node.js) Load Base64-encoded X.509 Certificate (.cer)

Loads a digital certificate from a base64 encoded DER X.509 Certificate (.cer, .crt) and fetches information about the cert.

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() {

    var cert = new chilkat.Cert();

    var success;

    // LoadFromFile will load virtually any certificate format file.
    // It will auto-recognize the format and load appropiately.
    // A base64-encoded DER X.509 certificate file
    // contains the binary DER in base64 encoded form.
    // Therefore, it is a text file that will begin like this:
    // -----BEGIN CERTIFICATE-----
    // MIIFbjCCBFagAwIBAgIGdDPNv/L0MA0GCSqGSIb3DQEBBQUAMIHKMQswCQYDVQQG
    // EwJVUzEQMA4GA1UECBMHQXJpem9uYTETMBEGA1UEBxMKU2NvdHRzZGFsZTEaMBgG
    // ...

    success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat_base64.cer");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    // DN = "Distinguished Name"
    console.log("SubjectDN:" + cert.SubjectDN);

    console.log("Common Name:" + cert.SubjectCN);
    console.log("Issuer Common Name:" + cert.IssuerCN);

    console.log("Serial Number:" + cert.SerialNumber);

}

chilkatExample();