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Editorial Team
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Asked: 2026-06-07T13:34:37+00:00

I use log4net in my ASP.NET MVC sites, and want to start using a

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I use log4net in my ASP.NET MVC sites, and want to start using a similar package in my JavaScript (such as log4javascript) to do logging there. Especially logging of exceptions, but also debug logging if a user reports that something went wrong but it isn’t readily reproducable.

I now have these questions about integrating log4javascript with ASP.NET MVC:

1) I want to send log messages to the server using log4javascript’s AjaxAppender. Is there a package that will implement the web service that receives log messages and logs them server side?

2) I want to be able to set the level of client side loggers in the server side web.config, just as with log4net. This way I could switch on debug logging when needed without hacking JavaScript code (all JS will be combined and minified on production).

I guess on each page load the server can read the web.config and generate a bit of JavaScript that creates the client side loggers. Is there a package that does this?

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1 Answer

  1. Editorial Team

    log4javascript author here.

    1. I don’t know of a service that does this, but it’s pretty trivial to do with a web handler and log4net.

    2. Nothing I know of. I’ve considered writing an XML configurator for log4javascript but no-one’s ever asked.

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