diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,14 @@
+0.0.12
+    move from   versions in Workspace8 2019
+0.0.9 radical reduction to use Text only
+0.0.11 structure regularized
+            added LanguageCodes, needs uniform-algebras
+    v0.0.4 for aeson >2.0
+    v0.0.5 for ghc 9.2.1, aeson >= 2 
+    0.0.6 change in error to use ExceptionT
+    0.0.6.1 added getAtKey for int
+
+  0.0.6.1 for lts-19.16 with aeson 2.0.3.0 - 
+      
+0.1.5 branch for ghc 9.2.5
+0.1.5.1    
diff --git a/GPL_3 b/GPL_3
new file mode 100644
--- /dev/null
+++ b/GPL_3
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+Uniform approach to use JSON and YAML
+
+To use JSON and YAML in Haskell - connecting to other tools which expects input or produce output in those formats - is a challenge.
+A set of functions which were used in a few projects - some connected to `pandoc` - are here collected and arranged to work in the uniform style (use ErrIO, `text`).  
diff --git a/Setup.lhs b/Setup.lhs
new file mode 100644
--- /dev/null
+++ b/Setup.lhs
@@ -0,0 +1,6 @@
+#!/usr/bin/runhaskell 
+> module Main where
+> import Distribution.Simple
+> main :: IO ()
+> main = defaultMain
+
diff --git a/src/Uniform/Json.hs b/src/Uniform/Json.hs
new file mode 100644
--- /dev/null
+++ b/src/Uniform/Json.hs
@@ -0,0 +1,163 @@
+----------------------------------------------------------------------
+--
+-- Module      :  Uniform.Json
+--
+------------------------------------------------- --------------------
+{-# LANGUAGE ConstraintKinds #-}
+{-# LANGUAGE DoAndIfThenElse #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE UndecidableInstances #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+-- | the operations on JSON data types
+module Uniform.Json
+  ( module Uniform.Json,
+    -- module Uniform.Error, -- or at least 
+    ErrIO,
+    Value (..),
+    ToJSON (..),
+    FromJSON (..),
+    fromJSON,
+    decode,
+    omitNothingFields,
+    eitherDecode,
+    -- , encode
+    object,
+    (.=),
+    genericParseJSON,
+    defaultOptions,
+    genericToJSON,
+    fieldLabelModifier,
+    HML.fromList,
+    HML.toList,
+    Result (..),
+    encode,
+    encodePretty,
+    parseEither, parseMaybe
+  )
+where
+
+import Control.Lens
+  ( at,
+    (&),
+    (?~),
+    (^?),
+  )
+import Data.Aeson
+import Data.Aeson.Types 
+import Data.Aeson as Aeson
+-- import Data.Aeson.Lens (key, AsValue)
+-- import Data.Aeson.Text 
+import Data.Aeson.Encode.Pretty (encodePretty)
+import Data.Aeson.Lens
+import qualified Data.HashMap.Lazy as HML
+import qualified Data.Aeson.KeyMap as KM -- added for ghc 9.2
+import UniformBase
+-- import Uniform.Error hiding (at)
+-- import Uniform.Strings hiding (at)
+
+encodeT :: ToJSON a => a -> Text
+encodeT = bb2t . bl2b . encode
+
+fromJSONmaybe :: FromJSON a => Value -> Maybe a
+fromJSONmaybe v = case (fromJSON v) of
+  Success a -> Just a
+  _ -> Nothing
+
+instance Zeros Value where zero = Null
+
+fromJSONm :: (FromJSON a, Show a) => Value -> ErrIO a
+-- DO NOT USE ! fromJSONm :: (FromJSON a, MonadError m) => Value -> m a
+fromJSONm v = result1 (fromJSON v)
+-- fromJSONm :: (FromJSON a, MonadError m) => Value -> m a
+
+-- | the following gives error msg
+fromJSONerrio :: (FromJSON a, Show a) => Value -> ErrIO a
+fromJSONerrio v = callIO $ do
+  result1 (fromJSON v)
+
+fromJSONfailError :: (FromJSON a, Show a) => Value -> ErrIO a
+-- | converts fromJson to a record structure
+-- throws error if fails
+fromJSONfailError v = case (fromJSON v) of
+            Success a -> return a
+            x -> throwErrorWords ["fromJson", showT x]
+
+result1 :: (Monad m, MonadFail m) => Result a -> m a
+result1 (Aeson.Error msg) = fail msg
+result1 (Aeson.Success a) = return a
+
+-- a difernt solution
+-- | get a maybe value from a json value 
+gak :: Data.Aeson.Lens.AsValue s => s -> Key -> Maybe Value
+gak b k = (^?) b (key k)
+
+-- | get and set at a key
+class AtKey vk v where
+  getAtKey :: vk -> Key -> Maybe v
+
+  getAt2Key :: vk -> Key -> Key -> Maybe v
+  -- ^ two keys: one after the other
+
+  putAtKey :: Key -> v -> vk -> vk
+
+instance AtKey Value Text where
+  getAtKey meta2 k2 = meta2 ^? key k2 . _String
+  getAt2Key meta2 k1 k2 = meta2 ^? key k1 . key k2 . _String
+  putAtKey k2 txt meta2 = meta2 & _Object . at k2 ?~ String txt
+
+instance AtKey Value Integer where
+  getAtKey meta2 k2 = meta2 ^? key k2 . _Integral
+  getAt2Key meta2 k1 k2 = meta2 ^? key k1 . key k2 . _Integral
+  putAtKey k2 txt meta2 = meta2 & _Object . at k2 ?~ toJSON txt
+
+instance AtKey Value Bool where
+  getAtKey meta2 k2 = meta2 ^? key k2 . _Bool
+  getAt2Key meta2 k1 k2 = meta2 ^? key k1 . key k2 . _Bool
+  putAtKey k2 txt meta2 = meta2 & _Object . at k2 ?~ Bool txt
+
+instance AtKey Value Value where
+  getAtKey meta2 k2 = meta2 ^? key k2  
+  getAt2Key meta2 k1 k2 = meta2 ^? key k1 . key k2  
+--   putAtKey k2 txt meta2 = meta2 & _Object . at k2 ?~ Bool txt
+
+class AtKey2 vk v where
+--   getAtKey :: vk -> Key -> Maybe v
+--   getAt2Key :: vk -> Key -> Text -> Maybe v
+
+  -- ^ two keys: one after the other
+
+  putAtKey2 :: Key -> v -> vk -> vk
+
+instance (ToJSON a) => AtKey2 Value a where
+  -- getAtKey meta2 k2 = meta2 ^? key k2 . _Integral
+  -- getAt2Key meta2 k1 k2 = meta2 ^? key k1 . key k2 . _Integral
+  putAtKey2 k2 txt meta2 = meta2 & _Object . at k2 ?~ toJSON txt
+
+mergeLeftPref ::[Value] -> Value
+-- ^ The (left-biased) union of two maps.
+-- all values must be objects, which can be prooduced with toJSON
+-- It prefers the first map when duplicate keys are encountered,
+-- http://hackage.haskell.org/package/hashmap-1.3.3/docs/Data-HashMap.html
+-- mergeLeftPref = Object . HML.unions .  map unObject
+-- for ghc 9.2.1
+mergeLeftPref = Object .unions' .  map unObject
+
+unions' :: [KM.KeyMap Value]  -> KM.KeyMap Value
+unions' = KM.fromHashMap . HML.unions . map KM.toHashMap
+-- end
+
+mergeRightPref :: [Value] -> Value
+mergeRightPref = mergeLeftPref . reverse
+
+instance NiceStrings Value where
+  shownice = bb2t . bl2b . encodePretty
+
+unObject :: Value -> Object
+unObject (Object x) = x
+unObject z = errorT ["unObject in Json.hs: No Object available", "given", showT z]
diff --git a/src/Uniform/Yaml.hs b/src/Uniform/Yaml.hs
new file mode 100644
--- /dev/null
+++ b/src/Uniform/Yaml.hs
@@ -0,0 +1,101 @@
+---------------------------------------------------------------------
+--
+-- Module      :  Uniform.Yaml
+-- TOD separate markdown
+----------------------------------------------------------------------
+-- {-# LANGUAGE BangPatterns                   #-}
+{-# LANGUAGE ConstraintKinds #-}
+-- {-# LANGUAGE DeriveDataTypeable    #-}
+{-# LANGUAGE DoAndIfThenElse #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeFamilies #-}
+-- {-# LANGUAGE TypeSynonymInstances        #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+module Uniform.Yaml
+  ( module Uniform.Yaml,
+    -- module Uniform.Error, -- or at least 
+    ErrIO,
+    -- , Y.decodeEither'
+    Y.ParseException (..),
+    -- , module Data.Yaml
+    Y.decodeFileThrow,
+    Y.encode,
+    Y.decode,
+    Y.decodeEither,
+    Options(..)
+  )
+where
+
+-- import Path -- (Path, Abs, Rel, File, Dir)
+-- import Uniform.FileIO (read8, Extension(..))
+import Data.Aeson.Types (Options(..))
+
+import qualified Data.Yaml as Y
+import UniformBase
+-- import Uniform.Error
+-- import Unifor.Strings
+-- import Uniform.FileIO
+import Uniform.Json
+-- import Uniform.TypedFile (TypedFile5 (..), TypedFiles7 (..))
+
+decodeThrowT :: Text -> ErrIO Value
+decodeThrowT = Y.decodeThrow . t2b
+
+newtype YamlText = YamlText Text deriving (Show, Read, Eq, Ord)
+
+-- a wrapper around Markdonw text
+-- todo clean up - use wrap7
+unYAML :: YamlText -> Text
+unYAML (YamlText a) = a --needed for other ops
+
+extYAML :: Extension
+extYAML = Extension "yaml"
+
+yamlFileType :: TypedFile5 Text YamlText
+
+instance Zeros YamlText where zero = YamlText zero
+
+yamlFileType = TypedFile5 {tpext5 = extYAML} :: TypedFile5 Text YamlText
+
+--instance FileHandles YamlText
+-- what is missing here?
+
+instance TypedFiles7 Text YamlText where
+  -- handling Markdown and read them into YamlText
+  wrap7 = YamlText
+  unwrap7 (YamlText a) = a
+
+readYaml2value :: Path Abs File -> ErrIO Value
+-- read a yaml file to a value
+-- error when syntax issue
+readYaml2value fp = do
+  t <- read8 fp yamlFileType
+  return . yaml2value $ t
+
+yaml2value :: YamlText -> Value
+-- convert a YamlText to a JSON value, error if not ok
+-- how to debug input erros?
+yaml2value yt = either (error . show) Prelude.id vx
+  where
+    vx = Y.decodeEither' (t2b . unYAML $ yt) :: Either Y.ParseException Value
+
+readYaml2rec :: (FromJSON a, Show a) => Path Abs File -> ErrIO a 
+-- | read a yaml file into a record Value 
+-- error when syntax fault
+readYaml2rec fn = do 
+    -- putIOwords [" yaml file name", showT fn ]
+    -- settingsTxt <- read8 settingsfilename yamlFileType
+    s0 :: Value <- readYaml2value fn 
+    -- putIOwords ["yaml read", showPretty s0 ]
+
+    s1  <-  fromJSONerrio  s0  -- :: Result Settings 
+
+    -- putIOwords ["json parsed", showT s1 ]
+
+    return s1
+-- for a test use readSettingsfile
diff --git a/tests/Testing.hs b/tests/Testing.hs
new file mode 100644
--- /dev/null
+++ b/tests/Testing.hs
@@ -0,0 +1,42 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   top tests for layout
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings     #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE UndecidableInstances  #-}
+{-# LANGUAGE PackageImports #-}
+
+
+module Main     where      -- must have Main (main) or Main where
+
+
+--import System.Exit
+
+import         "HTF"  Test.Framework
+import     {-@ HTF_TESTS @-}       Uniform.Json_test
+-- import     {-@ HTF_TESTS @-}       Uniform.Yaml_test
+
+-- import           Uniform.Strings
+import UniformBase
+
+--import TestingFileIO
+
+test_fileio = assertBool False
+
+main :: IO ()
+main = do
+
+    putIOwords ["HTF LayoutTest.hs:\n posTest"]
+--    htfMainWithArgs ["--quiet"] htf_importedTests
+    htfMain   htf_importedTests
+    putIOwords ["HTF end LayoutTest.hs:\n posTest"]
+    runTest test_fileio
+    return ()
diff --git a/tests/Uniform/Json_test.hs b/tests/Uniform/Json_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Uniform/Json_test.hs
@@ -0,0 +1,266 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :  FileIO.ByteString
+--
+-- | the implementation for filepath encoded as bytestring (RawFilePath = FilePathX)
+--
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+-- {-# LANGUAGE DeriveFunctor           #-}
+{-# LANGUAGE FlexibleContexts     #-}
+{-# LANGUAGE FlexibleInstances       #-}
+-- {-# LANGUAGE FunctionalDependencies  #-}
+{-# LANGUAGE MultiParamTypeClasses   #-}
+{-# LANGUAGE OverloadedStrings       #-}
+{-# LANGUAGE ScopedTypeVariables     #-}
+{-# LANGUAGE TypeFamilies            #-}
+-- {-# LANGUAGE TypeSynonymInstances #-}
+{-# LANGUAGE UndecidableInstances    #-}
+{-# LANGUAGE DeriveGeneric    #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE PackageImports #-}
+
+{-# OPTIONS_GHC -fno-warn-missing-methods #-}
+
+
+module Uniform.Json_test where
+
+import GHC.Generics
+import         "HTF"  Test.Framework
+-- import           Uniform.Zero
+import           Data.Aeson
+-- import Data.Map 
+import           Uniform.Time
+import UniformBase
+import           Uniform.Json
+
+-- import Test.Invariant
+-- import Uniform.ByteString
+--import qualified Data.ByteString as BS
+--
+-- testing for json records including time for show/read 
+
+data Person =
+  Person { firstName  :: !Text
+         , lastName   :: !Text
+         , age        :: Int
+         , likesPizza :: Bool
+           } deriving (Show, Read,Ord, Eq, Generic)
+instance FromJSON Person
+instance ToJSON Person 
+
+data PersonKurz =
+  PersonKurz { firstName  :: !Text
+         , lastName   :: !Text
+           } deriving (Show, Read,Ord, Eq, Generic)
+instance FromJSON PersonKurz
+instance ToJSON PersonKurz 
+
+k1 = PersonKurz "paul" "kurz"
+p1 = Person "peter" "meier" 30 True
+
+-- ex1 = { "firstName"  : "Daniel"
+--    , "lastName"   : "Díaz"
+--    , "age"        :  24
+--    , "likesPizza" :  true
+--      }        
+p2j = toJSON p1 
+k2j = toJSON k1 
+
+test_fromJSON = do 
+        res <- runErr . callIO $ do 
+                    let a =  fromJSON p2j 
+                    a2 :: Person <- result1 a
+                    return a2
+        assertEqual (Right p1) res 
+
+test_getAtKeyInt =  
+        assertEqual (Just 30::Maybe Int) (getAtKey p2j "age" )
+
+
+
+-- only solution, other hang without msg  
+-- test_fromJSONk = do  -- fails with error msg
+--             -- important is callIO 
+--         res <- runErr . callIO $ do 
+--                     let a =  fromJSON k2j 
+--                     a2 :: Person <- result1 a
+--                     return a2
+--         assertEqual (Right p1) res 
+
+-- test_fromJSONx = do 
+--         res <- runErr  $ do 
+--                     let a =  fromJSON p2j 
+--                     a2 :: Person <- result1 a
+--                     return a2
+--         assertEqual (Right p1) res 
+
+-- test_fromJSONxk = do  -- hangs
+--         res <- runErr  $ do 
+--                     let a =  fromJSON k2j 
+--                     a2 :: Person <- result1 a
+--                     return a2
+--         assertEqual (Right p1) res 
+
+-- the best solution -- but hangs if fields not present
+-- test_fromJSONm = do 
+--     res <- runErr $ 
+--                 do 
+--                     a2 <- fromJSONm k2j 
+--                     -- a2 :: Person <- result1 a
+--                     return a2
+--     assertEqual (Right p1) res  -- expects fields not present
+
+-- test_fromJSONm = do 
+--     res <- runErr $ 
+--                 do 
+--                     a2 <- fromJSONm p2j 
+--                     -- a2 :: Person <- result1 a
+--                     return a2
+--     assertEqual (Right p1) res 
+
+test_fromJSONerrio = do 
+    res <- runErr $ fromJSONerrio p2j 
+                    -- a2 :: Person <- result1 a
+                    -- return a2
+    assertEqual (Right p1) res 
+-- test_fromJSONerrioKurz = do 
+--     res <- runErr $ fromJSONerrio k2j 
+--                     -- a2 :: Person <- result1 a
+--                     -- return a2
+--     assertEqual (Right p1) res 
+
+
+-- before 0.4 
+-- data MetaRec = MetaRec {
+--         -- text ::  Text  -- ^ naked filename -- not shown
+--         -- , link :: Text -- ^ the url relative to dough dir
+--         title :: Maybe Text -- ^ the title as shown
+--         , date :: Maybe UTCTime -- read the time early one to find errors
+--         , date2 ::  UTCTime -- read the time early one to find errors
+--         , int1 :: Int -- to test assignement
+--         } deriving (Generic, Eq, Ord, Show, Read)
+
+-- instance Zeros MetaRec where
+--     zero = MetaRec zero (Just year2000) year2000 zero
+-- --instance FromJSON IndexEntry
+-- instance ToJSON MetaRec
+-- instance FromJSON MetaRec where
+
+-- rec1 :: MetaRec
+-- rec1 = zero { title = Just "rec1" } :: MetaRec
+-- rec1shown :: String
+-- rec1shown = show rec1 :: String
+
+-- test_jsonTime :: IO ()
+-- test_jsonTime = assertEqual rec1 (readNote "testJsonTime" rec1shown :: MetaRec)
+
+-- test_encode :: IO ()
+-- test_encode = assertEqual res1 $ encode rec1
+-- -- res1 :: Data.ByteString.Lazy.Internal.ByteString
+-- res1 =
+--     "{\"int1\":0,\"date\":\"2000-01-01T00:00:00Z\",\"title\":\"rec1\",\"date2\":\"2000-01-01T00:00:00Z\"}"
+
+
+-- -- encode rec1 
+
+-- -- rec1json = Object (fromList [("date"
+-- --                         ,String "2000-01-01T00:00:00Z")
+-- --                         ,("title",String "rec1")
+-- --                         ,("date2",String "2000-01-01T00:00:00Z")])
+-- rec1json' :: Value
+-- rec1json' = toJSON rec1
+
+-- json2rec :: Either String MetaRec
+-- json2rec = eitherDecode res1 :: Either String MetaRec
+-- test_setInt :: IO ()
+-- test_setInt =
+--     assertEqual rec2json $ putAtKey "int1" (22 :: Integer) (toJSON rec0)
+
+-- rec2json :: Value
+-- rec2json = toJSON $ MetaRec zero (Just year2000) year2000 22
+-- rec0 :: MetaRec
+-- rec0 = MetaRec zero (Just year2000) year2000 zero
+
+-- -- test_force = assertBool False 
+
+-- test_fromJ = assertEqual (Just rec1) (fromJSONmaybe rec1json')
+-- -- test_fromJx = assertEqual  Nothing (fromJSONmaybe rec1json')
+
+-- val :: Value
+-- val = object [
+--   "boolean" .= True,
+--   "numbers" .= [1,2,3::Int] ]  
+
+-- test_val = assertEqual v1 (showT val)
+-- v1 = "Object (fromList [(\"boolean\",Bool True),(\"numbers\",Array [Number 1.0,Number 2.0,Number 3.0])])"
+
+-- test to see if a partial update with merge works
+
+data RecFull = RecFull {boolean :: Bool 
+                        , numbers :: [Int]
+                        , firstInt :: Int
+                        , secondReal :: Double 
+                        , thirdString :: String 
+                        , fourthText :: Text 
+                        } 
+                        deriving (Read, Show, Eq, Ord, Generic)
+
+instance ToJSON RecFull 
+instance FromJSON RecFull
+
+ 
+data RecPart = RecPart {firstInt :: Int
+                , fourthText :: Text }
+                deriving (Read, Show, Eq, Ord, Generic)
+                
+instance ToJSON RecPart 
+instance FromJSON RecPart
+
+val7 = RecFull True [1,2,3] 1 2.22 "aaaa"  "áäö"
+valOutput :: RecFull 
+valOutput = RecFull {boolean = True, numbers = [1,2,3], firstInt = 1, secondReal = 2.22, thirdString = "aaaa", fourthText = "\225\228\246"}
+valj = toJSON val7 
+
+aDemo = do 
+    p1 :: RecPart <-  (fromJSONm valj)
+    putIOwords["the the part record from json", showT p1]
+
+    let p2 = p1 {firstInt = 2, fourthText = "ascii"} :: RecPart
+    let p2j = toJSON p2 
+
+    let p3j = mergeLeftPref [p2j, valj]   -- first wins?
+    putIOwords ["the merged p3", showT p3j]
+
+    p3 :: RecFull <-  (fromJSONm p3j) 
+    putIOwords ["the merged p3 from json", showT p3]
+
+test_partialUpdate = do 
+    res <- runErr $ do
+        p1 :: RecPart <-  (fromJSONm valj)  -- get part
+        let p2 = p1 {firstInt = 2, fourthText = "ascii"} :: RecPart
+                -- updated part
+        let p2j = toJSON p2
+        let p3j = mergeLeftPref [p2j, valj] -- first wins
+        p2check  :: RecPart <-  (fromJSONm p3j)
+
+        return (p2, p2check) 
+    let Right (p2, p2check) = res
+    assertEqual p2 p2check  
+
+test_partialUpdateReverse = do 
+    res <- runErr $ do
+        p1 :: RecPart <-  (fromJSONm valj)  -- get part
+        let p2 = p1 {firstInt = 2, fourthText = "ascii"} :: RecPart
+                -- updated part
+        let p2j = toJSON p2
+        let p3j = mergeRightPref [valj, p2j] -- first wins
+        p2check  :: RecPart <-  (fromJSONm p3j)
+
+        return (p2, p2check) 
+    let Right (p2, p2check) = res
+    assertEqual p2 p2check  
+
+    -------------- test merge left with val7 RecFull and k1 PersonKurz
+
+mlp = mergeLeftPref [toJSON k1, toJSON val7]
diff --git a/tests/Uniform/Yaml_test.hs b/tests/Uniform/Yaml_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Uniform/Yaml_test.hs
@@ -0,0 +1,36 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :  yaml test
+
+
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+--{-# LANGUAGE AllowAmbiguousTypes   #-}
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+{-# LANGUAGE PackageImports #-}
+-- {-# OPTIONS_GHC -fno-warn-missing-methods #-}
+
+module Uniform.Yaml_test  where
+--
+-- --import qualified Data.Text as T
+-- import qualified System.Posix  as P (FileStatus)
+-- --import qualified System.Directory as S
+--
+---- using uniform:
+-- import           Uniform.Error -- hiding ((</>), (<.>))
+-- import           Uniform.Strings     hiding ((</>), (<.>))
+            -- (s2t, showT, t2s, removeChar, CharChains2 (..), Text)
+--import Safe   -- todo error
+ 
+
+import         "HTF"  Test.Framework
+-- import Test.Invariant
+-- import Uniform.Filenames
+
+
diff --git a/uniform-json.cabal b/uniform-json.cabal
new file mode 100644
--- /dev/null
+++ b/uniform-json.cabal
@@ -0,0 +1,78 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.35.2.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 91c57d89d01ab321adfd3ad7f72a6b6fd8e0b13c316db871a6e0ee839077570b
+
+name:           uniform-json
+version:        0.1.5.1
+synopsis:       handling of JSON and YAML in an uniform way
+description:    remove particular aspects of abstraction in json and yaml - with an eye to use it with pandoc
+category:       Data Text JSON YAML Pandoc
+homepage:       https://github.com/git@github.com:andrewufrank/u4blog.git#readme
+bug-reports:    https://github.com/git@github.com:andrewufrank/u4blog.git/issues
+author:         Andrew Frank
+maintainer:     Andrew U. Frank <frank@geoinfo.tuwien.ac.at>
+copyright:      2021 Andrew U. Frank
+license:        GPL
+license-file:   GPL_3
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://github.com/git@github.com:andrewufrank/u4blog.git
+  subdir: uniform-json
+
+library
+  exposed-modules:
+      Uniform.Json
+      Uniform.Yaml
+  other-modules:
+      Paths_uniform_json
+  hs-source-dirs:
+      src
+  build-depends:
+      aeson
+    , aeson-pretty
+    , base >=4.7 && <5
+    , lens
+    , lens-aeson
+    , monads-tf
+    , pretty-show
+    , uniformBase >=0.1.5
+    , unordered-containers
+    , yaml
+  default-language: Haskell2010
+
+test-suite json-test
+  type: exitcode-stdio-1.0
+  main-is: Testing.hs
+  other-modules:
+      Uniform.Json_test
+      Uniform.Yaml_test
+      Paths_uniform_json
+  hs-source-dirs:
+      tests
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      HTF
+    , aeson
+    , aeson-pretty
+    , base >=4.7 && <5
+    , lens
+    , lens-aeson
+    , monads-tf
+    , pretty-show
+    , quickcheck-text
+    , time
+    , uniform-json >=0.1.5
+    , uniform-time >=0.1.5
+    , uniformBase
+    , unordered-containers
+    , yaml
+  default-language: Haskell2010
