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Exceptionless Error Reporting Service is Now Exceptional++

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Exceptionless Error Reporting Service is Now Exceptional++

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Blake Niemyjski Exceptionless Error Reporting Service Goes Open Source

It’s a big day at Exceptionless.

We are super excited to announce that we are open sourcing the Exceptionless code! That’s right, now you can hack on our real-time error reporting tool yourself.

Too many apps are throwing too many errors out there, resulting in confused users, lost business, and endless frustration.

We believe Exceptionless can help the development community become more in-tune with their code by making those errors more transparent, trackable, and squashable. More importantly, we want to support developers building and shipping better code for their users.

Cool, Where Do I Start?

Check out the Exceptionless Github Repository, and make sure to read about contributing if you plan on helping us improve the project.


Why Open Source?

In short, we want to see what the community can do with our baby, which we consider a great development tool. The open source movement has provided innovation throughout the industry, and we cannot tell you how excited we are to be a part of it.

We hope you will take it, add to it, suggest great new features, and report bugs, but most of all we hope you will use it to build better apps for the world.

The Exceptionless Team will continue to work on a road map of features and improvements, all while providing support to developers that want to contribute.

Planned features/enhancements




What Is Exceptionless?

The definition of the word exceptionless is: to be without exception. Our product provides real-time .NET error reporting for your ASP.NET, Web API, WebForms, WPF, Console, and MVC apps. It organizes the gathered information into simple actionable data that will help your app become exceptionless. Best of all, it’s open source!

  • Error notifications, including critical and regressions

  • Easily see top errors and prioritize them

  • Intelligent .NET exception grouping into stacks

  • Dashboard with error stats and trends

  • Detailed error reports, including stacktrace

  • Add any custom objects to your error reports

  • Unlimited users per organization

  • Mark exceptions as fixed, monitor for regressions

  • Real-time view of exceptions as they happen

  • Ability to mark errors as being critical

  • Supports offline and occassionally connected scenarios

  • Easy setup in less than 5 minutes

exceptionless / Exceptionless

Getting Started

** NOTE: If you simply want to use Exceptionless, just go to http://exceptionless.com and signup for a free account and you will be up and running in seconds.

  1. You will need to have Visual Studio 2013 installed.
  2. Start MongoDB and Redis by opening StartBackendServers.bat.
  3. Open the Exceptionless.sln Visual Studio solution file.
  4. Select Exceptionless.App and Exceptionless.SampleConsole as startup projects.
  5. Run the project.
  6. The app will automatically make the 1st user that is created a Global Admin and will also create a sample Acme organization and project.
  7. Send a test error from the sample console application and you should see it show up immediately in the website.

Alternatively, you can watch this short YouTube video showing how to get started with the project.

Using Exceptionless

Refer to the Exceptionless documentation here: Exceptionless Docs

Hosting Options

  1. We provide very reasonably priced hosting at Exceptionless. By using our hosted service, you are supporting the project and helping it get better!
  2. If you would rather host Exceptionless yourself, you will need to follow these steps:
    1. Setup Mongo and Redis servers. We highly recommend that you run these on Linux systems because the Windows versions aren't as performant and reliable as the Linux versions. We also highly recommend that you setup Mongo in a replica set configuration.
    2. Setup IIS and add the Exceptionless website.
    3. Modify the connection strings in Web.config to point to your Mongo and Redis servers.
    4. Change the WebsiteMode to Production in the Web.config appSettings section.

How is Exceptionless licensed?

The Exceptionless server is licensed under GNU AGPL v3.0. The client libraries are licensed under Apache License v2.0.

We want Exceptionless to be free for those of you who want to host the application and data internally or just simply do not want to pay for a hosted account. Our hope is that by making the application free and open source that more people will be aware of it and use it which will indirectly result in more people using our hosted service.

The server is licensed under the AGPL license to ensure that any modifications that are made will be contributed back to the community.

We chose to release the client libraries under Apache License v2.0 to remove any ambiguity as to the extent of the server license — you do not have to license any software that uses Exceptionless under AGPL and are completely free to use any licensing mechanism of your choice.


Take the easy way, and let them host it or you can host it yourself. I love that they provide this option...


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