diff --git a/aeson-typescript.cabal b/aeson-typescript.cabal
--- a/aeson-typescript.cabal
+++ b/aeson-typescript.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: c6fb058c83889fc039a860d05177c52295c974f6ccb536cad58fdd015c161359
+-- hash: 74aae5bd5d3353838039530c9ce854fa79c1a282fa2d73d232a7d5677ad341e2
 
 name:           aeson-typescript
-version:        0.1.3.0
+version:        0.2.0.0
 synopsis:       Generate TypeScript definition files from your ADTs
 description:    Please see the README on Github at <https://github.com/codedownio/aeson-typescript#readme>
 category:       Text, Web, JSON
diff --git a/src/Data/Aeson/TypeScript/Formatting.hs b/src/Data/Aeson/TypeScript/Formatting.hs
--- a/src/Data/Aeson/TypeScript/Formatting.hs
+++ b/src/Data/Aeson/TypeScript/Formatting.hs
@@ -13,11 +13,15 @@
 
 -- | Format a single TypeScript declaration. This version accepts a FormattingOptions object in case you want more control over the output.
 formatTSDeclaration :: FormattingOptions -> TSDeclaration -> String
-formatTSDeclaration (FormattingOptions {numIndentSpaces}) (TSTypeAlternatives name genericVariables names) = [i|type #{name}#{getGenericBrackets genericVariables} = #{alternatives};|]
+formatTSDeclaration (FormattingOptions {..}) (TSTypeAlternatives name genericVariables names) =
+  [i|type #{typeNameModifier name}#{getGenericBrackets genericVariables} = #{alternatives};|]
   where alternatives = T.intercalate " | " (fmap T.pack names)
-formatTSDeclaration (FormattingOptions {numIndentSpaces}) (TSInterfaceDeclaration interfaceName genericVariables members) = [i|interface #{interfaceName}#{getGenericBrackets genericVariables} {
+
+formatTSDeclaration (FormattingOptions {..}) (TSInterfaceDeclaration interfaceName genericVariables members) =
+  [i|interface #{modifiedInterfaceName}#{getGenericBrackets genericVariables} {
 #{lines}
 }|] where lines = T.intercalate "\n" $ fmap T.pack [(replicate numIndentSpaces ' ') <> formatTSField member <> ";"| member <- members]
+          modifiedInterfaceName = (\(i, name) -> i <> interfaceNameModifier name) . splitAt 1 $ interfaceName
 
 -- | Format a list of TypeScript declarations into a string, suitable for putting directly into a @.d.ts@ file.
 formatTSDeclarations' :: FormattingOptions -> [TSDeclaration] -> String
diff --git a/src/Data/Aeson/TypeScript/Types.hs b/src/Data/Aeson/TypeScript/Types.hs
--- a/src/Data/Aeson/TypeScript/Types.hs
+++ b/src/Data/Aeson/TypeScript/Types.hs
@@ -69,12 +69,20 @@
 
 -- * Formatting options
 
-data FormattingOptions = FormattingOptions {
-  numIndentSpaces :: Int
+data FormattingOptions = FormattingOptions
+  { numIndentSpaces       :: Int
   -- ^ How many spaces to indent TypeScript blocks
+  , interfaceNameModifier :: String -> String
+  -- ^ Function applied to generated interface names
+  , typeNameModifier :: String -> String
+  -- ^ Function applied to generated type names
   }
 
-defaultFormattingOptions = FormattingOptions 2
+defaultFormattingOptions = FormattingOptions
+  { numIndentSpaces = 2
+  , interfaceNameModifier = id
+  , typeNameModifier = id
+  }
 
 -- | Convenience typeclass class you can use to "attach" a set of Aeson encoding options to a type.
 class HasJSONOptions a where