Hello, so what's a typical setup/stack for a clojure webapp that uses Datomic Cloud/Ions to exposes an API to the web ?

As far as tooling for managing routes & request handlers, the most popular are probably Ring, Compojure (built on Ring) & Pedestal. The ions starter (https://github.com/Datomic/ion-starter) uses Ring directly. Here’s an example with Pedestal (https://github.com/pedestal/pedestal-ions-sample). Ring/Compojure use middleware for common code, and pedestal uses an interceptor stack.

Cool! the pedestal sample README answers many of my questions, thanks a lot!

In my local repl calls to (ion/get-params) return nil, is there a way to provide details that I suspect in live would exist?