gistfile1.hs

import Data.Aeson
import Data.Attoparsec
import qualified Data.Enumerator as E
import qualified Data.Enumerator.Binary as Eb
import qualified Data.Enumerator.List as El
import qualified Data.ByteString as BS

byteLines :: Monad m => E.Enumeratee BS.ByteString BS.ByteString m b
byteLines = Eb.splitWhen (== 10) -- 10 is LF

main :: IO ()
main =
  E.run_ $ Eb.enumFile "events40k.json"
       E.$= byteLines
       E.$= El.map (parse json)
       E.$$ El.mapM_ print