diff --git a/backend/deps.edn b/backend/deps.edn
index 166dbee5d7..97a4b0f24d 100644
--- a/backend/deps.edn
+++ b/backend/deps.edn
@@ -13,7 +13,7 @@
         metosin/reitit-ring {:mvn/version "0.3.7"}
         metosin/reitit-middleware {:mvn/version "0.3.7"}
         metosin/reitit-spec {:mvn/version "0.3.7"}
-        ;; metosin/reitit-dev {:mvn/version "0.3.7"}
+        metosin/reitit-dev {:mvn/version "0.3.7"}
 
         org.jsoup/jsoup {:mvn/version "1.10.2"}
         hiccup/hiccup {:mvn/version "1.0.5"}
diff --git a/backend/src/uxbox/api/errors.clj b/backend/src/uxbox/api/errors.clj
index 42e69a1e6e..45cec6cdd2 100644
--- a/backend/src/uxbox/api/errors.clj
+++ b/backend/src/uxbox/api/errors.clj
@@ -5,26 +5,18 @@
 ;; Copyright (c) 20162019 Andrey Antukh <niwi@niwi.nz>
 
 (ns uxbox.api.errors
-  "A errors handling for api."
-  (:require [reitit.ring.middleware.exception :as exception]))
-
+  "A errors handling for api.")
 
 (defmulti handle-exception #(:type (ex-data %)))
 
 (defmethod handle-exception :validation
   [err]
-  ;; (println "\n*********** stack trace ***********")
-  ;; (.printStackTrace err)
-  ;; (println "\n********* end stack trace *********")
   (let [response (ex-data err)]
     {:status 400
      :body response}))
 
 (defmethod handle-exception :default
   [err]
-  ;; (println "\n*********** stack trace ***********")
-  ;; (.printStackTrace err)
-  ;; (println "\n********* end stack trace *********")
   (let [response (ex-data err)]
     {:status 500
      :body response}))
@@ -78,9 +70,3 @@
   (.printStackTrace error)
   (println "\n********* end stack trace *********")
   (handler error request))
-
-(def exception-middleware
-  (exception/create-exception-middleware
-    (assoc exception/default-handlers
-           ::exception/default errors-handler
-           ::exception/wrap wrap-print-errors)))
diff --git a/backend/src/uxbox/api/middleware.clj b/backend/src/uxbox/api/middleware.clj
index 63de3f70ff..db5115c6d0 100644
--- a/backend/src/uxbox/api/middleware.clj
+++ b/backend/src/uxbox/api/middleware.clj
@@ -8,9 +8,11 @@
   (:require [muuntaja.core :as m]
             [promesa.core :as p]
             [reitit.core :as rc]
+            [reitit.dev.pretty :as pretty]
             [reitit.ring.middleware.multipart :as multipart]
             [reitit.ring.middleware.muuntaja :as muuntaja]
             [reitit.ring.middleware.parameters :as parameters]
+            [reitit.ring.middleware.exception :as exception]
             [ring.middleware.session :refer [wrap-session]]
             [ring.middleware.session.cookie :refer [cookie-store]]
             [struct.core :as st]
@@ -68,7 +70,7 @@
              (fn [req key spec]
                (let [[errors, result] ((:fn spec) (get req key))]
                  (if errors
-                   (ex/raise :type :parameters-validation
+                   (ex/raise :type :validation
                              :code (:key spec)
                              :context errors
                              :value (get req key)
@@ -91,6 +93,8 @@
     {:name ::parameters-validation-middleware
      :compile compile}))
 
+
+
 (def ^:private session-middleware
   (let [options {:store (cookie-store {:key "a 16-byte secret"})
                  :cookie-name "session"
@@ -107,12 +111,20 @@
 ;;                                                     "content-type"
 ;;                                                     "authorization"])})
 
+(def ^:private exception-middleware
+  (exception/create-exception-middleware
+   (assoc exception/default-handlers
+          ::exception/default api-errors/errors-handler
+          ::exception/wrap api-errors/wrap-print-errors)))
+
+
 (def ^:private muuntaja-instance
   (m/create (update-in m/default-options [:formats "application/transit+json"]
                        merge {:encoder-opts {:handlers t/+write-handlers+}
                               :decoder-opts {:handlers t/+read-handlers+}})))
 (def router-options
   {;;:reitit.middleware/transform dev/print-request-diffs
+   :exception pretty/exception
    :data {:muuntaja muuntaja-instance
           :middleware [session-middleware
                        parameters/parameters-middleware
@@ -122,7 +134,7 @@
                        ;; encoding response body
                        muuntaja/format-response-middleware
                        ;; exception handling
-                       api-errors/exception-middleware
+                       exception-middleware
                        ;; decoding request body
                        muuntaja/format-request-middleware
                        ;; validation