This is a great solution. For fun I had a go at golfing it a bit: (-> "https://gist.githubusercontent.com/jorin-vogel/7f19ce95a9a842956358/raw/e319340c2f669

This is a great solution. For fun I had a go at golfing it a bit: (-> "https://gist.githubusercontent.com/jorin-vogel/7f19ce95a9a842956358/raw/e319340c2f6691f9cc8d8cc57ed532b5093e3619/data.json" client/get :body (json/parse-string true) (->> (remove (comp nil? :creditcard)) (map (comp (partial join ",") (juxt :name :creditcard))) (join "\n") (apply str "Name,Credit Card\n") (spit (-> (java.text.SimpleDateFormat. "YYYYMMDD") (.format (java.util.Date.)) (str ".csv"))))) edit: Shorter, requires `(require '[clojure.string :refer [join]])`