Around a year ago I joined a new team where I work, and this team was starting to undertake a full rewrite of their code. We were going from a full c#/mvc app to a tiny c# api, and a very big SPA.
Early one one of the huge things to do was to make sure that our JavaScript error logs could land in our Log4Net infrastructure. I started to write something to do just that, and as I was coding I quickly realized this was less trivial that it sounded. We had something internal we could use, but it was tied to a lot of other code that we didn't want to pull in.
I started Bingling around and I stumbled across jsnlog. JSN log lets you quickly wire up your client side logs to your server. I have been able to get PR's into the code base and the guy behind it has been very friendly to me when I have had questions.