(Node.js) Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML.

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 asn = new chilkat.Asn();

    var success;

    // Begin with loading ASN.1 from a binary DER/BER format file.
    success = asn.LoadBinaryFile("/Users/chilkat/testData/p7b/test.p7b");
    if (success !== true) {
        console.log(asn.LastErrorText);
        return;
    }

    // Convert ASN.1 to XML:
    var strXml = asn.AsnToXml();
    if (asn.LastMethodSuccess !== true) {
        console.log(asn.LastErrorText);
        return;
    }

    // The XML returned by AsnToXml will be compact and not pretty-formatted.
    // Use Chilkat XML to format the XML better:
    var xml = new chilkat.Xml();
    success = xml.LoadXml(strXml);
    // Assuming success for this example..
    // This is formatted better for human viewing:
    console.log(xml.GetXml());

    // Now get the ASN.1 in base64 format.  Any encoding supported
    // by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
    var strBase64 = asn.GetEncodedDer("base64");

    // Load the ASN.1 from XML:
    var asn2 = new chilkat.Asn();
    success = asn2.LoadAsnXml(xml.GetXml());
    if (success !== true) {
        console.log(asn2.LastErrorText);
        return;
    }

    // Load the ASN.1 from an encoded string, such as base64:
    var asn3 = new chilkat.Asn();
    success = asn3.LoadEncoded(strBase64,"base64");
    if (success !== true) {
        console.log(asn3.LastErrorText);
        return;
    }


}

chilkatExample();