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Where can you find JavaScript polyfills?

Yesterday, I gushed about why I love polyfills.

So, where do you find them?

  1. The Mozilla Developer Network is a great place to learn about JavaScript APIs. They’ll often include links to polyfills if they exist or are needed.
  2. GitHub is filled with polyfills of varying quality. I typically look at any existing issues and the number of stars in evaluating whether or not they’re any good.
  3. Remy Sharp, who coined the term, maintains a list of his own polyfills. Literally anything he writes is awesome.
  4. After a while, you may start to feel comfortable writing your own. I recently did that for the Validity State API after I was unable to find a polyfill elsewhere.

🚀 Make 2018 the year you master JavaScript! My pocket guides and mini courses are short, focused, and made for beginners. You can do this!

Have any questions or comments about this post? Email me at or contact me on Twitter at @ChrisFerdinandi.

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