jsFiddle is a shell editor that eases writing JavaScript code by creating a custom environment based on popular JS frameworks.

It presents an interface which is divided into 4 pieces:

  • HTML editor
  • CSS editor
  • JavaScript editor
  • and the output

You can select the framework & the version of your choice (MooTools, jQuery, Dojo, Prototype, YUI, Glow,Vanilla). Also, if there is, you can add a complimentary framework like jQuery UI or MooTools More.

jsFiddle

A great feature is the ability to save & share the code created with a unique URL generated. Optionally, jsFiddle has an embedding feature too.

It is an almost perfect platform for trying & sharing your JavaScript code without the need of a website.

What would be better is the ability to select multiple JS frameworks at the same time (also having a server-side file & an editable database would make it a complete playground).

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