See github stars on a list of projects

getStarsOnTheFly.js

// On this URL 
// https://github.com/markerikson/redux-ecosystem-links/blob/master/routing.md
// or this:
// https://github.com/MicheleBertoli/css-in-js
// or any place with links to a github repo;
// go to developer console and run:

const fetchStars = url => {
  const [, user, repo] = url.match(/https:\/\/github.com\/([^\/]*)\/(.*)\/?$/);
  return fetch(`https://api.github.com/repos/${user}/${repo}`)
    .then(response => response.json())
    .then(data => {
      if (data.message && data.message.startsWith('API rate limit exceeded')) {
        return 'API rate limit exceeded'
      } else {
        return data.stargazers_count
      }
    })
    .catch(error => console.log(error))
}

const bigList = Array.from(document.querySelectorAll('#readme a'))
  .filter(a => /^https:\/\/github/.test(a.getAttribute('href')));

bigList.map(a => {
  const url = a.getAttribute('href');
  fetchStars(url).then(stars =>
    a.insertAdjacentHTML('beforeEnd', ` <span>★ ${stars}</span>`)
  )
})