[lostcolony]

Did...did you miss my callout to the author's definition? Per that, Sinatra is a library. The structure of endpoints is no different than function calls; where they go is not proscribed.

I'm not saying that's a good definition.

[dnautics]

look, "all" is meaningless. What constitutes "most" is a matter of judgement. Sinatra does guide you in your code organization a hell of a lot more than something like, "a json parser library".

[lostcolony]

Sounds like you might be defining library vs framework as "library's are collections of functions with minimal if any state that needs carrying between calls to exposed functions" then. Which is a possible way to distinguish them! Just...not how the author did.

Of course, that makes things like Go's inbuilt HTTP a bit weird; it's part of the standard library, but it also necessitates setting up handlers, which would potentially make it framework.

[dnautics]

I'm conforming to the authors definition, as you present it. Under these criteria, Sinatra is categorically closer to rails than a Jason library. What might an http server library look like? It would have a function that blocks on accepting a socket, a function that parses the socket contents into a data structure, and a function that lets you send a response. That's not what Sinatra looks like, at all. If you make a claim otherwise, you are on shaky ground. Let go.