JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo" data-foo="bar" />

JavaScript

var div = document.getElementsByTagName("div")[0],
    attributes = div.attributes,
    i = attributes.length;

for (; i--; ){
    if (/^data-.*/.test(attributes[i].name)) {
        console.log(attributes[i].name);
    }
}