diff --git a/jsonifier.cabal b/jsonifier.cabal
--- a/jsonifier.cabal
+++ b/jsonifier.cabal
@@ -1,5 +1,5 @@
 name: jsonifier
-version: 0.1.0.6
+version: 0.1.1
 synopsis: Fast and simple JSON encoding toolkit
 description:
   Minimalistic library for encoding JSON directly to strict bytestring,
diff --git a/library/Jsonifier.hs b/library/Jsonifier.hs
--- a/library/Jsonifier.hs
+++ b/library/Jsonifier.hs
@@ -22,6 +22,8 @@
   -- ** Composites
   array,
   object,
+  -- ** Low-level
+  writeJson,
 )
 where
 
@@ -212,3 +214,22 @@
           Size.object count contentsSize
         poke =
           Poke.openingCurlyBracket <> bodyPoke <> Poke.closingCurlyBracket
+
+{-|
+Any JSON literal manually rendered as Write.
+
+This is a low-level function allowing to avoid unnecessary processing
+in cases where you already have a rendered JSON at hand.
+
+You can think of Write as a specialized version of ByteString builder.
+You can efficiently convert a ByteString to Write using 'PtrPoker.Write.byteString',
+making it possible to have parts of the JSON value tree rendered using other libraries.
+You can as well manually implement encoders for your custom types.
+
+__Warning:__
+
+It is your responsibility to ensure that the content is correct,
+otherwise you may produce invalid JSON.
+-}
+writeJson :: Write.Write -> Json
+writeJson = coerce
diff --git a/library/Jsonifier/Write.hs b/library/Jsonifier/Write.hs
--- a/library/Jsonifier/Write.hs
+++ b/library/Jsonifier/Write.hs
@@ -8,7 +8,10 @@
 
 {-# INLINE scientificString #-}
 scientificString :: Scientific -> Write
-scientificString a =
-  case scientificAsciiDec a of
-    Write size poke ->
-      Write (size + 2) (Poke.doubleQuote <> poke <> Poke.doubleQuote)
+scientificString =
+  stringBody . scientificAsciiDec
+
+{-# INLINE stringBody #-}
+stringBody :: Write -> Write
+stringBody (Write size poke) =
+  Write (size + 2) (Poke.doubleQuote <> poke <> Poke.doubleQuote)