diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Slug 0.1.2
+
+* Improved error messages in `parseJSON`.
+
 ## Slug 0.1.1
 
 * Add `Read` instance of `Slug`.
diff --git a/LICENSE.md b/LICENSE.md
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,4 +1,4 @@
-Copyright © 2015 Mark Karpov
+Copyright © 2015–2016 Mark Karpov
 
 All rights reserved.
 
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [![License BSD3](https://img.shields.io/badge/license-BSD3-brightgreen.svg)](http://opensource.org/licenses/BSD-3-Clause)
 [![Hackage](https://img.shields.io/hackage/v/slug.svg?style=flat)](https://hackage.haskell.org/package/slug)
 [![Stackage Nightly](http://stackage.org/package/slug/badge/nightly)](http://stackage.org/nightly/package/slug)
+[![Stackage LTS](http://stackage.org/package/slug/badge/lts)](http://stackage.org/lts/package/slug)
 [![Build Status](https://travis-ci.org/mrkkrp/slug.svg?branch=master)](https://travis-ci.org/mrkkrp/slug)
 [![Coverage Status](https://coveralls.io/repos/mrkkrp/slug/badge.svg?branch=master&service=github)](https://coveralls.io/github/mrkkrp/slug?branch=master)
 
@@ -53,6 +54,6 @@
 
 ## License
 
-Copyright © 2015 Mark Karpov
+Copyright © 2015–2016 Mark Karpov
 
 Distributed under BSD 3 clause license.
diff --git a/Web/Slug.hs b/Web/Slug.hs
--- a/Web/Slug.hs
+++ b/Web/Slug.hs
@@ -1,6 +1,6 @@
 -- |
 -- Module      :  Web.Slug
--- Copyright   :  © 2015 Mark Karpov
+-- Copyright   :  © 2015–2016 Mark Karpov
 -- License     :  BSD 3 clause
 --
 -- Maintainer  :  Mark Karpov <markkarpov@openmailbox.org>
@@ -22,7 +22,7 @@
 where
 
 import Control.Exception (Exception)
-import Control.Monad (mzero, (>=>), liftM)
+import Control.Monad ((>=>), liftM)
 import Control.Monad.Catch (MonadThrow (..))
 import Data.Aeson.Types (ToJSON (..), FromJSON (..))
 import Data.Char (isAlphaNum)
@@ -32,8 +32,8 @@
 import Database.Persist.Sql (PersistFieldSql (..))
 import Database.Persist.Types (SqlType (..))
 import Web.PathPieces
-import qualified Data.Aeson.Types as A
-import qualified Data.Text as T
+import qualified Data.Aeson as A
+import qualified Data.Text  as T
 
 -- | This exception is thrown by 'mkSlug' when its input cannot be converted
 -- into proper 'Slug'.
@@ -75,7 +75,7 @@
 -- in 'Maybe', in more complex contexts it will throw 'SlugException'
 -- exception using 'InvalidInput' constructor.
 --
--- This function also have a useful property:
+-- This function also has a useful property:
 --
 -- > mkSlug = mkSlug >=> mkSlug . unSlug
 
@@ -133,8 +133,10 @@
   toJSON = toJSON . unSlug
 
 instance FromJSON Slug where
-  parseJSON (A.String v) = maybe mzero return (parseSlug v)
-  parseJSON _            = mzero
+  parseJSON = A.withText "Slug" $ \txt ->
+    case parseSlug txt of
+      Left err -> fail (show err)
+      Right val -> return val
 
 instance PersistField Slug where
   toPersistValue   = toPersistValue . unSlug
diff --git a/slug.cabal b/slug.cabal
--- a/slug.cabal
+++ b/slug.cabal
@@ -2,7 +2,7 @@
 --
 -- Cabal configuration for ‘slug’.
 --
--- Copyright © 2015 Mark Karpov
+-- Copyright © 2015–2016 Mark Karpov
 --
 -- Redistribution and use in source and binary forms, with or without
 -- modification, are permitted provided that the following conditions are
@@ -32,7 +32,7 @@
 -- POSSIBILITY OF SUCH DAMAGE.
 
 name:                 slug
-version:              0.1.1
+version:              0.1.2
 cabal-version:        >= 1.10
 license:              BSD3
 license-file:         LICENSE.md
@@ -40,7 +40,7 @@
 maintainer:           Mark Karpov <markkarpov@opmbx.org>
 homepage:             https://github.com/mrkkrp/slug
 bug-reports:          https://github.com/mrkkrp/slug/issues
-category:             Web
+category:             Web, Yesod
 synopsis:             Type-safe slugs for Yesod ecosystem
 build-type:           Simple
 description:          Type-safe slugs for Yesod ecosystem.
@@ -80,7 +80,7 @@
                     , base                       >= 4.6 && < 5
                     , exceptions                 >= 0.6
                     , path-pieces                >= 0.1.5
-                    , slug                       >= 0.1.1
+                    , slug                       >= 0.1.2
                     , test-framework             >= 0.6 && < 1
                     , test-framework-quickcheck2 >= 0.3 && < 0.4
                     , text                       >= 1.0
diff --git a/tests/Main.hs b/tests/Main.hs
--- a/tests/Main.hs
+++ b/tests/Main.hs
@@ -2,7 +2,7 @@
 --
 -- Slug tests.
 --
--- Copyright © 2015 Mark Karpov
+-- Copyright © 2015–2016 Mark Karpov
 --
 -- Redistribution and use in source and binary forms, with or without
 -- modification, are permitted provided that the following conditions are