Greate documentation, lot's of info on StackOverflow and it's easy to learn, a lot of things it's already implemented on the stack. It's based on Ruby which is stable and constantly evolving.

Ruby/Rails have a lot of gems(libraries) that will allow you to connect to many DB systems, implement JWT or use a library for authentication.

I have a lot of API's created in Rails that respond to website and mobile apps, and you can create your first one without a lot of stress, responding with JSON easily.

You can use VSCode has good support for ruby and you will have all syntax help etc, I use Atom but I don't have the syntax support, didn't found a good package for that.