(Node.js) Convert Certificate from DER to PEM.

Loads a digital certificate from any format, such as DER, and saves to PEM format.

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();

    // LoadFromFile will load virtually any certificate format file.
    // It will auto-recognize the format and load appropiately.
    // In this case, load a DER format certificate and convert to PEM.
    var success = cert.LoadFromFile("qa_data/certs/testCert.cer");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    success = cert.ExportCertPemFile("qa_data/certs/testCert.pem");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    console.log("Converted certificate from DER to PEM format.");

}

chilkatExample();