var xmlserializer = require('xmlserializer');
var html2xhtml = function (htmlString) {
var parser = require('parse5'),
dom = parser.parse(htmlString);
return xmlserializer.serializeToString(dom);
};
console.log(html2xhtml('<p>An HTML document<br>with linebreaks<p>and more paragraphs.'));
Created from: https://npm.runkit.com/xmlserializer