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Fast JSON encoding and decoding for Clojure via the Jackson library.


(require '(clj-json [core :as json]))
(import '( StringReader BufferedReader))

(json/generate-string {"foo" "bar"})

(json/parse-string "{\"foo\":\"bar\"}")
{"foo" "bar"}

  (BufferedReader. (StringReader. "{\"foo\":\"bar\"}{\"biz\":\"bat\"}")))
({"foo" "bar"} {"biz" "bat"})


clj-json is available as a Maven artifact from Clojars.

Encoding/Decoding Details

clj-json can generate JSON for maps, vectors, lists, keywords, strings, integers, doubles, floats, and booleans.

Note that keywords generate as strings without a leading :, and will read via parse-string and parsed-seq as strings, however both have an optional boolean argument to keywordize the keys of maps.

Redefining Coercions

Coercions can be redefined by binding *coercions*. For example, to coerce sets into existence map:

(binding [clj-json.core/*coercions* {clojure.lang.PersistentHashSet (fn [x] (reduce (fn [acc x] (assoc acc x true)) {} x))}]
  (is (= {"foo" {"bang" true, "bar" true}}
        (json/generate-string {"foo" #{"bar" "bang"}})))))


To build, test, and package the clj-json source using Leiningen:

$ lein deps
$ lein javac
$ lein test
$ lein jar


Release under an MIT license.

Can you improve this documentation? These fine people already did:
Mark McGranaghan & lance bradley
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