Alex R. Young





reviews services webapps


Posted by Alex R. Young on .

reviews services webapps


Posted by Alex R. Young on .

ExceptionHub by Agile Productions is a new web service that tracks JavaScript exceptions. It uses a small (8.6
KB) JavaScript include that catches uncaught exceptions on your page and
then transparently sends them to the service. It can alert you by email,
or you can view the web interface. Each project also has an RSS feed.

You can view a summary of each error or a stack trace. ExceptionHub
groups similar exceptions like this:


ExceptionHub is a commercial service, but there is a free trial. Plans
start at \$5.00 a month for 3 projects, and all plans have unlimited

Supported Browsers

From what I can gather, Safari, Chrome, Firefox and IE are supported.
Opera is not. Firefox and IE support is through an onerror
handler. Chrome and Safari use a custom solution where all events are
wrapped in a closure.

Ryan Stout explains how it works in Improving JavaScript


Exception reporting systems can be useful for monitoring production
environments. I have a homegrown solution for my commercial web apps,
but I can understand why people use services like
Hoptoad. ExceptionHub is a little bit more niche because it targets JavaScript.

The usefulness of this is debatable. There are cases when duplicating
JavaScript bugs is difficult -- a customer reports a bug and you can't
quite reproduce it. ExceptionHub would at least alert you with the best
stack trace it can generate.

I've had good support from Agile Productions while testing the service,
and they've actually fixed a few minor niggles that I ran into. It's a
young service so I expect the user interface will evolve somewhat --
it's not bad by any means but it has that new Rails app feel.


If your site depends heavily on JavaScript, ExceptionHub could be
incredibly useful. Many sites fundamentally depend on complex
client-side logic, so Agile Productions could be onto a winning product
if they keep developing the concept.

I encourage you to check out the free trial and see what you think.