URL utils that I use in literally every app

url-utils.js

const removeTrailingSlash = path => path.replace(/\/$/, '');
const ensureTrailingSlash = path => `${removeTrailingSlash(path)}/`;

// Universal usage (no reliance on `document`)
const parseUrl = (href) => {
  const match = href.match(/^(https?:)\/\/(([^:/?#]*)(?::([0-9]+))?)([/]{0,1}[^?#]*)(\?[^#]*|)(#.*|)$/);
  return match && {
    protocol: match[1],
    host: match[2],
    hostname: match[3],
    port: match[4],
    pathname: match[5],
    search: match[6],
    hash: match[7],
  };
};