How do I create a json in clojurescript

Question

I have some clojurescript that I want to interop with some javascript libraries. In my clojurescript code I do some analysis and come up with a list of maps. something like

[{:prop1 "value1" :prop2 "value2"}, {:prop1 "something else" :prop2 "etc"}...]

I need to pass this to a javascript functions as

[{prop1: "value1", prop2: "value2}, {..} ...]

I'm not sure how to return a javascript object form my clojurescript function though. Is there a way to serialize nested maps and lists to javascript objects. Or a way to create a new javascript object and then set properties on it?

Answer 1

I found a function here

(defn clj->js
  "Recursively transforms ClojureScript maps into Javascript objects,
   other ClojureScript colls into JavaScript arrays, and ClojureScript
   keywords into JavaScript strings.

   Borrowed and updated from mmcgrana."
  [x]
  (cond
    (string? x) x
    (keyword? x) (name x)
    (map? x) (.-strobj (reduce (fn [m [k v]]
               (assoc m (clj->js k) (clj->js v))) {} x))
    (coll? x) (apply array (map clj->js x))
    :else x))

Does exactly what I needed. There is also the inverse function, namely js->clj in ClojureScript core.

Answer 2

Just for the sake of people looking for something similar.

The ClojureScript core now contains a clj->js function.

Answer 3

This works for me:

(defn clj->json
  [ds]
  (.stringify js/JSON (clj->js ds)))

usage:

(let [json (clj->json data-structure)]
  ;; do something with json
  )