Just use stuff that works, and that most people already know. Python, Perl, Ruby, jQuery, PHP, etc. Any of those have all the tools you need, proper documentation, millions of Stack Overflow discussions, and exceptional ecosystems and communities.
I am a Perl enthusiast since more than ten years. Personnal opinion, feel free to ignore it. It got the incredible [Mojolicious](https://mojolicious.org) framework that makes possible to deploy a full API through a oneliner. I know everybody hates Perl (especially for web development), but I am really tired of all the re-inventing the wheels.
I would never study another languages. I am forty. I am tired.