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How to parse JSON POST request ?

Vaniall macchiato app, created as per documentation

lein new macchiato first

The request looks like this:

curl -H "Content-Type: application/json" \
-H "Accept: application/json" \
-X POST -d '{"foo":"bar"}' http://localhost:3000/bar

The bar function looks like this

(defn bar [req res raise]
  (println req)
  (-> "bar"
      (r/ok)
      (r/content-type "application/json")
      (res)))

route looks like

“/bar” {:post bar}

the middleware looks like

(defaults/wrap-defaults handler defaults/api-defaults)

What do I need to do in order to be able to parse the body of the request?

Doing something like this:

(js/JSON.parse (:body req))

complains about

SyntaxError: Unexpected token o in JSON at position 1

Thanks