Bool package:aeson

Bool :: Bool -> Value

aeson Data.Aeson Data.Aeson.Types

bool :: Bool -> Encoding

aeson Data.Aeson.Encoding Data.Aeson.Encoding.Internal

withBool :: String -> (Bool -> Parser a) -> Value -> Parser a

aeson Data.Aeson Data.Aeson.Types

withBool expected f value applies f to the Value when value is a Boolean and fails otherwise.

Error message example

withBool "MyType" f (String "oops")
-- Error: "parsing MyType failed, expected Boolean, but encountered String"