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Live Scratchpad

Evaluate your JavaScript functions in real-time _while_ editing.

Inspect objects or DOM elements manipulated during execution, figure out the code path taken inside the function, directly jump to errors...

Cut the feedback loop to the minimum, conversational programming style! :)


Direct video link


Code that does not run gets faded out.

Click an object to inspect its properties.

Click a DOM element to inspect it in the page inspector.


Firefox 11 or later.Firefox Nightly highly recommended!
(the add-on has more features on Nightly and is more tested with this version)

An update for Firefox 11 compatibility will come soon. Please check out twitter for update when it's ready.


Download and install the latest available add-on from here.

Feedback? or drop by #devtools.
Pull requests also accepted ;)