diff --git a/Yesod/Core/Json.hs b/Yesod/Core/Json.hs
--- a/Yesod/Core/Json.hs
+++ b/Yesod/Core/Json.hs
@@ -4,6 +4,8 @@
     ( -- * Convert from a JSON value
       defaultLayoutJson
     , jsonToRepJson
+    , returnJson
+    , provideJson
 
       -- * Convert to a JSON value
     , parseJsonBody
@@ -23,7 +25,9 @@
     , acceptsJson
     ) where
 
-import Yesod.Core.Handler (HandlerT, getRequest, invalidArgs, redirect, selectRep, provideRep, rawRequestBody)
+import Yesod.Core.Handler (HandlerT, getRequest, invalidArgs, redirect, selectRep, provideRep, rawRequestBody, ProvidedRep)
+import Control.Monad.Trans.Writer (Writer)
+import Data.Monoid (Endo)
 import Yesod.Core.Content (TypedContent)
 import Yesod.Core.Types (reqAccept)
 import Yesod.Core.Class.Yesod (defaultLayout, Yesod)
@@ -60,6 +64,20 @@
 -- /Since: 0.3.0/
 jsonToRepJson :: (Monad m, J.ToJSON a) => a -> m J.Value
 jsonToRepJson = return . J.toJSON
+{-# DEPRECATED jsonToRepJson "Use returnJson instead" #-}
+
+-- | Convert a value to a JSON representation via aeson\'s 'J.toJSON' function.
+--
+-- Since 1.2.1
+returnJson :: (Monad m, J.ToJSON a) => a -> m J.Value
+returnJson = return . J.toJSON
+
+-- | Provide a JSON representation for usage with 'selectReps', using aeson\'s
+-- 'J.toJSON' function to perform the conversion.
+--
+-- Since 1.2.1
+provideJson :: (Monad m, J.ToJSON a) => a -> Writer (Endo [ProvidedRep m]) ()
+provideJson = provideRep . return . J.toJSON
 
 -- | Parse the request body to a data type as a JSON value.  The
 -- data type must support conversion from JSON via 'J.FromJSON'.
diff --git a/Yesod/Core/Types.hs b/Yesod/Core/Types.hs
--- a/Yesod/Core/Types.hs
+++ b/Yesod/Core/Types.hs
@@ -300,6 +300,8 @@
 data Location url = Local url | Remote Text
     deriving (Show, Eq)
 
+-- | A diff list that does not directly enforce uniqueness.
+-- When creating a widget Yesod will use nub to make it unique.
 newtype UniqueList x = UniqueList ([x] -> [x])
 
 data Script url = Script { scriptLocation :: Location url, scriptAttributes :: [(Text, Text)] }
diff --git a/yesod-core.cabal b/yesod-core.cabal
--- a/yesod-core.cabal
+++ b/yesod-core.cabal
@@ -1,5 +1,5 @@
 name:            yesod-core
-version:         1.2.0.4
+version:         1.2.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -58,7 +58,7 @@
                    , monad-logger          >= 0.3.1    && < 0.4
                    , conduit               >= 0.5
                    , resourcet             >= 0.4.6    && < 0.5
-                   , lifted-base           >= 0.1
+                   , lifted-base           >= 0.1.2
                    , attoparsec-conduit
                    , blaze-html            >= 0.5
                    , blaze-markup          >= 0.5.1