Mock an API by using a well-structured directory tree

mock_api.clj

(defn mock-api-response
  [prefix-path uri]
  (let [resource-path (format "%s/%s/index.json" prefix-path uri)]
    {:headers {"Content-Type" "application/json"
               "Access-Control-Allow-Origin" "*"}
     :body (slurp (io/resource resource-path))}))

(defroutes routes
  (GET "/mock/:uri{[\\/\w\d]+}" [uri]
    (mock-api-response "mock_api" uri)))