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Logging to from Umbraco

Since Umbraco itself is written in ASP.NET, ELMAH works like a dream inside Umbraco. Besides logging uncaught errors, also supports other types of messages like information and debug. In fact, all the log levels that you already know from log4net, NLog and Serilog, are supported on as well. Logging in Umbraco CMS is based on Serilog, which also support. We have brought all these pieces together into a NuGet package that we call: Elmah.Io.Umbraco.

To start utilizing from your Umbraco site, all you need to do is install the Elmah.Io.Umbraco package:

Install-Package Elmah.Io.Umbraco
dotnet add package Elmah.Io.Umbraco
<PackageReference Include="Elmah.Io.Umbraco" Version="3.*" />
paket add Elmah.Io.Umbraco

During the installation, you will be asked for your API key (Where is my API key?) and log ID (Where is my log ID?).

Hit F5 and watch messages start flowing into

Umbraco Cloud

When using Umbraco Cloud, you may not have a local clone of the source code. To install on Umbraco cloud, execute the following steps:

Install-Package Elmah.Io.Umbraco
dotnet add package Elmah.Io.Umbraco
<PackageReference Include="Elmah.Io.Umbraco" Version="3.*" />
paket add Elmah.Io.Umbraco
  • Commit and push all changes to the git respository. This will add logging to your remote Umbraco Cloud project.

In case you want logging to different logs from each Umbraco Cloud environment, please check out Umbraco's support for config transformations here: Config transforms.

What's inside?

The Elmah.Io.Umbraco package basically installs and configures three things:

  • The Serilog sink (Warning and above)
  • An Umbraco content finder for logging 404's
  • ELMAH with as error log

All unhandled exceptions from both ASP.NET / MVC / Web API as well as 404's are logged automatically. Warnings, errors and fatal messages logged through Serilog are send to as well.


If you are running on the default Umbraco template, all nessecary configuration is added during installation of the Elmah.Io.Umbraco NuGet package. If your web.config file for some reason aren't updated during installation, you can configure manually: Configure manually. Likewise, the installer configure the sink for Serilog in your config\serilog.user.config file.

Different environments

You may have different environments like Staging and Production. At least you have two: Localhost and Production. If you want to log to different error logs depending on the current environment, check out Use multiple logs for different environments. Web.config transformations work on the Web.config file only but you may have other config files that need transformation as well. In terms of, the serilog.user.config file also includes configuration that you may want to disable on localhost and include on production. If you are running on Umbraco Cloud this is natively supported as explained here: Config Transforms. Even in self-hosted environments, you can achieve something similar using the SlowCheetah extension. Check out this question on Our for details: Deploying different umbracoSettings.config for different environments.

Umbraco 7

We still support Umbraco 7 through the Elmah.Io.Umbraco package version 3.2.35:

Install-Package Elmah.Io.Umbraco -Version 3.2.35
dotnet add package Elmah.Io.Umbraco --version 3.2.35
<PackageReference Include="Elmah.Io.Umbraco" Version="3.2.35" />
paket add Elmah.Io.Umbraco --version 3.2.35

New features will be added to the updated package for Umbraco 8 and newer only.

Umbraco Unicore

Playing with the alpha of the new version of Umbraco running on .NET Core? We are too. Luckily, already provides all of the bits and pieces needed to integrate Umbraco Unicore and

Start by installing the Elmah.Io.AspNetCore package:

Install-Package Elmah.Io.AspNetCore
dotnet add package Elmah.Io.AspNetCore
<PackageReference Include="Elmah.Io.AspNetCore" Version="3.*" />
paket add Elmah.Io.AspNetCore

Then add the following code to the ConfigureServices method in the Startup.cs file:

services.AddElmahIo(o =>
    o.ApiKey = "API_KEY";
    o.LogId = new Guid("LOG_ID");

Finally, add the following code to the Configure method before the call to UseUmbraco:


This will log all uncaught exceptions to If you want to hook into the internal logging of Umbraco, Install the Elmah.Io.Extensions.Logging package:

Install-Package Elmah.Io.Extensions.Logging
dotnet add package Elmah.Io.Extensions.Logging
<PackageReference Include="Elmah.Io.Extensions.Logging" Version="3.*" />
paket add Elmah.Io.Extensions.Logging

In the ConfigureLogging action in the Program.cs file add the following code after the call to ClearProviders:

x.AddElmahIo(options =>
    options.ApiKey = "API_KEY";
    options.LogId = new Guid("LOG_ID");
x.AddFilter<ElmahIoLoggerProvider>(null, LogLevel.Warning);

This will log all warnings and above to You can adjust the LogLevel but be aware that Umbraco outputs a lot of log messages which will quickly fill up your monthly quota.

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