PEM to XML

pem_to_xml.js

var fs = require('fs');
var path = require('path')
var NodeRSA = require('node-rsa');
var builder = require('xmlbuilder');

var pem = fs.readFileSync(path.join(__dirname, 'publicKey.pem'))
var key = new NodeRSA(pem);
var exportedPem = key.exportKey('components-public-pem');

var xml = builder.create('RSAKeyValue')
            .ele('Modulus', exportedPem.n.toString('base64')).up()
            .ele('Exponent', exportedPem.e)
            .end({ pretty: true});

console.log(xml);