diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Author name here (c) 2022
+
+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 Author name here 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/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# jsonl
+
+Adapter between 'aeson' and the JSONL format (https://jsonlines.org/)
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/jsonl.cabal b/jsonl.cabal
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--- /dev/null
+++ b/jsonl.cabal
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+name:                jsonl
+version:             0.1.0.0
+synopsis:            JSON Lines
+description:         Parse and serialize the JSONL format via @aeson@'s ToJSON/FromJSON
+homepage:            https://github.com/unfoldml/jsonl
+license:             BSD3
+license-file:        LICENSE
+author:              Marco Zocca
+maintainer:          UnfoldML AB
+copyright:           (c) 2022 UnfoldML AB, Marco Zocca
+category:            JSON, Web, Text
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
+tested-with:         GHC == 7.10.2
+
+library
+  default-language:    Haskell2010
+  ghc-options:         -Wall
+  hs-source-dirs:      src
+  exposed-modules:     JSONL
+  build-depends:       base >= 4.7 && < 5
+                     , aeson
+                     , bytestring
+
+-- executable jsonl
+--   default-language:    Haskell2010
+--   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+--   hs-source-dirs:      app
+--   main-is:             Main.hs
+--   build-depends:       base
+--                      , jsonl
+
+-- test-suite spec
+--   default-language:    Haskell2010
+--   ghc-options:         -Wall
+--   type:                exitcode-stdio-1.0
+--   hs-source-dirs:      test
+--   main-is:             Spec.hs
+--   build-depends:       base
+--                      , jsonl
+--                      , hspec
+--                      , QuickCheck
+
+source-repository head
+  type:     git
+  location: https://github.com/unfoldml/jsonl
diff --git a/src/JSONL.hs b/src/JSONL.hs
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--- /dev/null
+++ b/src/JSONL.hs
@@ -0,0 +1,80 @@
+{-# LANGUAGE RankNTypes #-}
+{-# language DeriveGeneric #-}
+{-# language OverloadedStrings #-}
+-- | JSON Lines https://jsonlines.org/
+module JSONL (
+  -- * Encode
+  jsonlWriteFile, jsonlToLBS, jsonlBuilder
+  -- * Decode
+ , jsonlFromLBS
+  ) where
+
+import System.IO (Handle, IOMode(..), withBinaryFile)
+
+-- aeson
+import Data.Aeson (ToJSON(..), FromJSON(..), encode, eitherDecode' )
+-- bytestring
+import qualified Data.ByteString.Builder as BBS (toLazyByteString, Builder, lazyByteString, string7)
+import qualified Data.ByteString.Builder.Internal as BBS (hPut, putBuilder)
+import qualified Data.ByteString.Internal as BS (c2w)
+import qualified Data.ByteString.Lazy as LBS (ByteString, span)
+
+import Prelude hiding (writeFile)
+
+-- | Parse a JSONL-encoded collection of objects from a `LBS.ByteString`
+--
+-- If parsing fails, returns the first parsing error in a Left
+jsonlFromLBS :: FromJSON a => LBS.ByteString -> Either String [a]
+jsonlFromLBS = sequence . jsonlFromLBS_
+
+jsonlFromLBS_ :: FromJSON a => LBS.ByteString -> [Either String a]
+jsonlFromLBS_ = go mempty
+  where
+    go :: FromJSON a => [Either String a] -> LBS.ByteString -> [Either String a]
+    go acc lbs = let
+      (s, srest) = LBS.span (== BS.c2w '\n') lbs
+      in go (eitherDecode' s : acc) srest
+
+
+-- jsonlFromLBS' :: FromJSON a => LBS.ByteString -> Either String [a]
+-- jsonlFromLBS' = chop1 (Right mempty)
+
+-- chop1 :: FromJSON a =>
+--          Either String [a] -> LBS.ByteString -> Either String [a]
+-- chop1 acce lbs = case acce of
+--   Right acc -> case eitherDecode' s of
+--     Right x -> chop1 (Right (x : acc)) srest
+--     Left e -> Left e
+--   ex -> ex
+--   where
+--     (s, srest) = LBS.span (== BS.c2w '\n') lbs
+
+-- | Write a collection of objects to a JSONL-encoded file
+jsonlWriteFile :: (Foldable t, ToJSON a) => FilePath -> t a -> IO ()
+jsonlWriteFile fpath xs = writeFile fpath (jsonlBuilder xs)
+
+-- | Render a collection of objects to a JSONL-encoded `LBS.ByteString`
+jsonlToLBS :: (Foldable t, ToJSON a) => t a -> LBS.ByteString
+jsonlToLBS xs = BBS.toLazyByteString $ jsonlBuilder xs 
+
+jsonlBuilder :: (Foldable t, ToJSON a) => t a -> BBS.Builder
+jsonlBuilder = foldMap jsonLine
+
+jsonLine :: ToJSON a => a -> BBS.Builder
+jsonLine x = jsonToBuilder x <> BBS.string7 "\n"
+
+jsonToBuilder :: ToJSON a => a -> BBS.Builder
+jsonToBuilder = BBS.lazyByteString . encode
+
+
+-- vendored from bytestring < 0.11.2
+
+hPutBuilder :: Handle -> BBS.Builder -> IO ()
+hPutBuilder h = BBS.hPut h . BBS.putBuilder
+
+modifyFile :: IOMode -> FilePath -> BBS.Builder -> IO ()
+modifyFile mode f bld = withBinaryFile f mode (`hPutBuilder` bld)
+
+writeFile :: FilePath -> BBS.Builder -> IO ()
+writeFile = modifyFile WriteMode
+