As a test developer, I love making tools, and I like to share my tools. It is always great to hear about how cool your tools are or how much their lives have been made easier.
In the past it wasn’t easy to distribute my tools, one reason is that not everyone has Python on their machine. It is totally different with JS. If you have a browser, you can run my code. It can be remote on a server, it can also be in a local folder.
It is also super simple to have nice-looking UI in JS, because HTML/CSS is much easier to tweak. I am not saying I don’t like command-line interface, just sometimes it is more intuitive to have a cool graph. There are also many ready framework you can grab from the internet, including one of my favorite Twitter Bootstrap. Not to mention countless JS plugins to show off/manipulate your data.
With all that being said, if you are a craftsman in heart like me, you should definitely try out some JS framework yourself too. You will not be disappointed:)