diff --git a/src/Renderer/JSON.hs b/src/Renderer/JSON.hs
index 86343e12b..da323d46b 100644
--- a/src/Renderer/JSON.hs
+++ b/src/Renderer/JSON.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE OverloadedStrings, TypeSynonymInstances, MultiParamTypeClasses  #-}
-{-# LANGUAGE DataKinds, GADTs, GeneralizedNewtypeDeriving, ScopedTypeVariables, TypeFamilies, TypeOperators #-}
+{-# LANGUAGE DataKinds, GADTs, GeneralizedNewtypeDeriving, ScopedTypeVariables, TypeFamilies, TypeOperators, UndecidableInstances #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 module Renderer.JSON
 ( json
@@ -99,6 +99,9 @@ instance ToJSONFields Category where
 instance ToJSONFields a => ToJSONFields (Maybe a) where
   toJSONFields = maybe [] toJSONFields
 
+instance (ToJSONFields a, ToJSONFields (f (Term f a))) => ToJSONFields (Term f a) where
+  toJSONFields term = let a :< f = runCofree term in toJSONFields a <> toJSONFields f
+
 
 lineFields :: (ToJSON leaf, ToJSON (Record fields), HasField fields Category, HasField fields Range, KeyValue kv) =>
   Int ->