clojure data json also works but since it's interpreted from source it's much much slower. If you're only dealing with small payloads that also works. You could also use a reader conditional for bb to use Cheshire

I'm using cheshire, just wanted to check if there's anything built-in I should use instead

Cheshire is the recommended one in bb

ok, I'm good then 🙂

Regarding core.async, you were running into this issue: https://github.com/babashka/babashka/issues/1216

Should be fixed with bb on master

Installable via:

bash <(curl ) --version 0.7.9-SNAPSHOT --dir .