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JOURNAL.txt Update JOURNAL.txt Jan 14, 2020
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index.html Add CoffeeScript syntax highlighting Jan 14, 2020
package-lock.json First round of implementation Jan 13, 2020
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yarn.lock First round of implementation Jan 13, 2020

Coffee Now

Coffee Now is a CoffeeScript playground that execute code directly in your browser, it's not sending the code to any other server to do so.

The UI is minimal, so you can use it anywhere and anytime, especially on mobile device.

Let me repeat, all of the code is executed right on your browser, please proceed with care!!! I don't write this app with your best interest in mind.


  • Use your keyboard, type in the code
  • Press Cmd + Enter or Ctrl + Enter if you're on a desktop
  • If you're on mobile, hit the Execute button
  • That's it.

You can share your code by click on the Share button, then copy the page URL and send it to anyone.

Try it online

You can try it at

Host it yourself

You can deploy Coffee Now as a static HTML page anywhere you want, for example, I'm using ZEIT Now.

$ yarn install
$ yarn dist
$ cd dist
$ now

Why am I building this?

During my parental leave, I found myself solving programming challenges for fun on my phone on and off, because you can't just sit at a laptop when there's a baby just waiting to cry every random hour for every random reason.

Most of the coding playground I can find online are just sucks, they either break the editing experience on the mobile or behave badly on small screen devices. Also, they send the code to a remote server to execute it before showing you the result, which is a waste. I'm using CoffeeScript and it should be compiled to JavaScript to run in the browser at my finger tip.

Oh, now you ask, why the "dead language"? I like doing more with less, and the beautiful syntax of CoffeeScript help me write less, especially writing code on mobile. That's why.

See JOURNAL.txt for more details.

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