ring: read body of a http request as string

Question

When handling a http request inside a ring server, the body of the request-data is stored in the request-hashmap in the key :body. For instance as followed:

Answer 1

You can use ring.util.request/body-string to get the request body as a String.

(body-string request) 

You need to remember that InputStream can be read only once so you might prefer replace the original :body with the read String instead so you can later access it again:

(defn wrap-body-string [handler]
  (fn [request]
    (let [body-str (ring.util.request/body-string request)]
      (handler (assoc request :body (java.io.StringReader. body-str))))))

And add your middleware to wrap your handler:

(def app
  (wrap-body-string handler))

Answer 2

The :body of ring request must be an instance of java.io.InputStream. So you can use reader + slurp to get a string out.

(defn is->str [is]
  (let [rdr (clojure.java.io/reader is)]
    (slurp rdr)))

Usage: (is->str (:body request))