core.clj

(-> {:keyword-key                "value0",
     "test key with whitespaces" "value1",
     "another key"               "value2"}
    clojure.data.json/write-str
    (clojure.data.json/read-str :key-fn keyword)
    prn-str
    read-string)
;; => {:keyword-key "value0",
;;     :test        key,
;;     with         whitespaces,
;;     "value1"     :another,
;;     key          "value2"}

(-> {:keyword-key                "value0",
     "test key with whitespaces" "value1",
     "another key"               "value2"}
    clojure.data.json/write-str
    clojure.data.json/read-str
    prn-str
    read-string)
;; => {"keyword-key"               "value0",
;;     "test key with whitespaces" "value1",
;;     "another key"               "value2"}