diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Li Meng Jun (c) 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Li Meng Jun nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/scotty-utils.cabal b/scotty-utils.cabal
new file mode 100644
--- /dev/null
+++ b/scotty-utils.cabal
@@ -0,0 +1,30 @@
+name:                scotty-utils
+version:             0.1.0.0
+synopsis:            Scotty utils library
+description:         Scotty utils library.
+homepage:            https://github.com/Lupino/yuntan-common/tree/master/scotty-utils#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Li Meng Jun
+maintainer:          lmjubuntu@gmail.com
+copyright:           MIT
+category:            Web, Scotty, Utils
+build-type:          Simple
+-- extra-source-files:
+cabal-version:       >=1.10
+
+
+library
+  hs-source-dirs:      src
+  exposed-modules:     Web.Scotty.Utils
+  build-depends:       base >= 4.7 && < 5
+                     , http-types
+                     , aeson
+                     , scotty
+                     , text
+                     , aeson-result
+  default-language:    Haskell2010
+
+source-repository head
+  type:     git
+  location: https://github.com/Lupino/yuntan-common
diff --git a/src/Web/Scotty/Utils.hs b/src/Web/Scotty/Utils.hs
new file mode 100644
--- /dev/null
+++ b/src/Web/Scotty/Utils.hs
@@ -0,0 +1,53 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Web.Scotty.Utils
+  ( maybeNotFound
+  , eitherNotFound
+  , eitherBadRequest
+  , err
+  , ok
+  , errNotFound
+  , errBadRequest
+  , okListResult
+  , safeParam
+  ) where
+
+import           Network.HTTP.Types (Status, status400, status404)
+import           Web.Scotty.Trans   (ActionT, Parsable, ScottyError, json,
+                                     param, rescue, status)
+
+import qualified Data.Aeson.Result  as R (Err, List, err, fromList, fromOk, ok)
+
+import           Data.Aeson         (ToJSON)
+import           Data.Text          (Text)
+import qualified Data.Text.Lazy     as LT (Text)
+
+maybeNotFound :: (ToJSON a, ScottyError e, Monad m) => String -> Maybe a -> ActionT e m ()
+maybeNotFound _ (Just a)  = json a
+maybeNotFound obj Nothing = err status404 $ obj ++ " not found."
+
+eitherBadRequest :: (ToJSON a, ScottyError e, Monad m) => Either R.Err a -> ActionT e m ()
+eitherBadRequest (Right a) = json a
+eitherBadRequest (Left e)  = status status400 >> json e
+
+eitherNotFound :: (ToJSON a, ScottyError e, Monad m) => Either R.Err a -> ActionT e m ()
+eitherNotFound (Right a) = json a
+eitherNotFound (Left e)  = status status404 >> json e
+
+err :: (ScottyError e, Monad m) => Status -> String -> ActionT e m ()
+err st msg = status st >> json (R.err msg)
+
+ok :: (ToJSON a, ScottyError e, Monad m) => Text -> a -> ActionT e m ()
+ok key = json . R.fromOk key . R.ok
+
+errNotFound :: (ScottyError e, Monad m) => String -> ActionT e m ()
+errNotFound = err status404
+
+errBadRequest :: (ScottyError e, Monad m) => String -> ActionT e m ()
+errBadRequest = err status400
+
+okListResult :: (ToJSON a, ScottyError e, Monad m) => Text -> R.List a -> ActionT e m ()
+okListResult key = json . R.fromList key
+
+safeParam ::(Parsable a, ScottyError e, Monad m) => LT.Text -> a -> ActionT e m a
+safeParam key def = param key `rescue` (\_ -> return def)