The weekend before last (28-Sep 2008) I blitzed through an idea I had on the shelf for about 6 months and put it live under the name JS Bin.

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What is it?

JS Bin is a form of paste bin, but with a twist. It allows you to also include the HTML and CSS to provide context to your pasty. As such, it means you can actually run the JavaScript and pass this on to a colleague to help to debug.

A short list of features:

  • Save private snippet
  • Remote Ajax debugging
  • Snippet URLs run entirely on their own (i.e. without the JS Bin framework around them)
  • Support to quickly inject major JS libraries
  • Saves state within the open window (i.e. refresh and the code doesn't reset)

In addition, any code snippet can be edited.

Take this example: query string aware JavaScript ( edit it, you just add '/edit' to the URL and you can modify the snippet yourself and save it as new:


I had a conversation with Rey Bango some months ago where he was trying to debug a piece of code that had an Ajax hit. He sent me the code, but without seeing it running I wasn't too much help to him.

I made a start some time ago offline and planned for a system to allow you to create fake Ajax handlers to respond to requests.

In the last couple of weeks I saw John Resig's learning app and the sandbox idea suddenly had legs again. I knew I could write something very quickly, almost entirely in JavaScript (and since it's a JS debugger, there's no point in the extra work to make it degrade).

A small server side php file does the saving work (and maintaining old code snippets) and over the course of a few hours I had a fully working webapp that allows me to create Ajax responders and code snippets that run live and can make real Ajax calls.


I've recorded a couple of screencasts showing how it can be used:


If anyone has suggestions, feedback, bugs, etc - please let me know!

Also announced on Ajaxian