Google Tag Manager has a very nifty programmatic API that lets you do almost anything that's also possible within the GTM UI. I've used the API a lot, most notably for my GTM Tools, which might be getting a new release soon, too! The API was recently updated to its second release version (V2), and in this article I want to go over the additions, removals, and changes that the new version introduced.
Last weekend, I wrote a very simple web app that automatically creates a number of referral spam filters to tackle the problem that seems to have everybody all riled up. For a nice recap of the situation, take a look at this post by Jeff Sauer, or this article by Mike Sullivan. This isn't an opinion piece, even though I've got a great number of opinions about this issue.
In 2013, I wrote a guide for Universal Analytics and Google Tag Manager on how to poll for weather conditions, and send this information to Google Analytics as a custom dimension of the session. The guide was intended as a technical introduction to Google Tag Manager, and I think it succeeded in that. However, GTM has changed a lot over the last 1.5 years, and I've made some improvements to the method along the way.
I've written a completely revamped version of this toolset for Google Tag Manager V2. Well, I just yesterday published the first of my GTM API tools (the Container Visualizer), and I vowed that I wouldn't release the other tools for a number of reasons. The reasons were good, in my opinion (especially the part about the tools being ugly as crap), but on the other hand I don't want to keep anyone away from the amazing potential of the new API.
[UPDATE:] Quite a lot of people had trouble accessing the tool after I published this post. This should now be fixed. So, AWESOME stuff. The new Google Tag Manager UI and API have just rolled out, and I can finally start revealing the stuff I've been working on :) I'm not going to go into the new UI in this post. I just want to give a huge thanks to the GTM team for working on the UX with such dedication.