(AesonOptions t, Generic a, GToJSON Zero (Rep a), GToEncoding Zero (Rep a)) => ToJSON (CustomJSON t a) Source #
Instance details Defined in Deriving.Aeson Methods toJSON :: CustomJSON t a -> Value # toEncoding :: CustomJSON t a -> Encoding # toJSONList :: [CustomJSON t a] -> Value # toEncodingList :: [CustomJSON t a] -> Encoding #
(AesonOptions t, Generic a, GFromJSON Zero (Rep a)) => FromJSON (CustomJSON t a) Source #
Instance details Defined in Deriving.Aeson Methods parseJSON :: Value -> Parser (CustomJSON t a) # parseJSONList :: Value -> Parser [CustomJSON t a] #

class FromJSON a #

A type that can be converted from JSON, with the possibility of failure.

In many cases, you can get the compiler to generate parsing code for you (see below). To begin, let's cover writing an instance by hand.

There are various reasons a conversion could fail. For example, an Object could be missing a required key, an Array could be of the wrong size, or a value could be of an incompatible type.

The basic ways to signal a failed conversion are as follows:

fail yields a custom error message: it is the recommended way of reporting a failure;
empty (or mzero) is uninformative: use it when the error is meant to be caught by some (<|>);
typeMismatch can be used to report a failure when the encountered value is not of the expected JSON type; unexpected is an appropriate alternative when more than one type may be expected, or to keep the expected type implicit.

prependFailure (or modifyFailure) add more information to a parser's error messages.

An example type and instance using typeMismatch and prependFailure:

-- Allow ourselves to write Text literals.
{-# LANGUAGE OverloadedStrings #-}

data Coord = Coord { x :: Double, y :: Double }

instance FromJSON Coord where
    parseJSON (Object v) = Coord
        <$> v .: "x"
        <*> v .: "y"

    -- We do not expect a non-Object value here.
    -- We could use empty to fail, but typeMismatch
    -- gives a much more informative error message.
    parseJSON invalid    =
        prependFailure "parsing Coord failed, "
            (typeMismatch "Object" invalid)

For this common case of only being concerned with a single type of JSON value, the functions withObject, withScientific, etc. are provided. Their use is to be preferred when possible, since they are more terse. Using withObject, we can rewrite the above instance (assuming the same language extension and data type) as:

instance FromJSON Coord where
    parseJSON = withObject "Coord" $ \v -> Coord
        <$> v .: "x"
        <*> v .: "y"

Instead of manually writing your FromJSON instance, there are two options to do it automatically:

Data.Aeson.TH provides Template Haskell functions which will derive an instance at compile time. The generated instance is optimized for your type so it will probably be more efficient than the following option.
The compiler can provide a default generic implementation for parseJSON.

To use the second, simply add a deriving Generic clause to your datatype and declare a FromJSON instance for your datatype without giving a definition for parseJSON.

For example, the previous example can be simplified to just:

{-# LANGUAGE DeriveGeneric #-}

import GHC.Generics

data Coord = Coord { x :: Double, y :: Double } deriving Generic

instance FromJSON Coord

The default implementation will be equivalent to parseJSON = genericParseJSON defaultOptions; if you need different options, you can customize the generic decoding by defining:

customOptions = defaultOptions
                { fieldLabelModifier = map toUpper
                }

instance FromJSON Coord where
    parseJSON = genericParseJSON customOptions

Instances

Instances details

FromJSON Bool
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Bool # parseJSONList :: Value -> Parser [Bool] #
FromJSON Char
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Char # parseJSONList :: Value -> Parser [Char] #
FromJSON Double
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Double # parseJSONList :: Value -> Parser [Double] #
FromJSON Float
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Float # parseJSONList :: Value -> Parser [Float] #
FromJSON Int
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Int # parseJSONList :: Value -> Parser [Int] #
FromJSON Int8
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Int8 # parseJSONList :: Value -> Parser [Int8] #
FromJSON Int16
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Int16 # parseJSONList :: Value -> Parser [Int16] #
FromJSON Int32
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Int32 # parseJSONList :: Value -> Parser [Int32] #
FromJSON Int64
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Int64 # parseJSONList :: Value -> Parser [Int64] #
FromJSON Integer	This instance includes a bounds check to prevent maliciously large inputs to fill up the memory of the target system. You can newtype `Scientific` and provide your own instance using `withScientific` if you want to allow larger inputs.
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Integer # parseJSONList :: Value -> Parser [Integer] #
FromJSON Natural
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Natural # parseJSONList :: Value -> Parser [Natural] #
FromJSON Ordering
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Ordering # parseJSONList :: Value -> Parser [Ordering] #
FromJSON Word
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Word # parseJSONList :: Value -> Parser [Word] #
FromJSON Word8
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Word8 # parseJSONList :: Value -> Parser [Word8] #
FromJSON Word16
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Word16 # parseJSONList :: Value -> Parser [Word16] #
FromJSON Word32
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Word32 # parseJSONList :: Value -> Parser [Word32] #
FromJSON Word64
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Word64 # parseJSONList :: Value -> Parser [Word64] #
FromJSON ()
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser () # parseJSONList :: Value -> Parser [()] #
FromJSON Scientific
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Scientific # parseJSONList :: Value -> Parser [Scientific] #
FromJSON UTCTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser UTCTime # parseJSONList :: Value -> Parser [UTCTime] #
FromJSON Text
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Text # parseJSONList :: Value -> Parser [Text] #
FromJSON Value
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Value # parseJSONList :: Value -> Parser [Value] #
FromJSON DotNetTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser DotNetTime # parseJSONList :: Value -> Parser [DotNetTime] #
FromJSON Key
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Key # parseJSONList :: Value -> Parser [Key] #
FromJSON Text
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Text # parseJSONList :: Value -> Parser [Text] #
FromJSON Void
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Void # parseJSONList :: Value -> Parser [Void] #
FromJSON Version
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Version # parseJSONList :: Value -> Parser [Version] #
FromJSON CTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser CTime # parseJSONList :: Value -> Parser [CTime] #
FromJSON IntSet
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser IntSet # parseJSONList :: Value -> Parser [IntSet] #
FromJSON ZonedTime	Supported string formats: `YYYY-MM-DD HH:MM Z` `YYYY-MM-DD HH:MM:SS Z` `YYYY-MM-DD HH:MM:SS.SSS Z` The first space may instead be a `T`, and the second space is optional. The `Z` represents UTC. The `Z` may be replaced with a time zone offset of the form `+0000` or `-08:00`, where the first two digits are hours, the `:` is optional and the second two digits (also optional) are minutes.
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser ZonedTime # parseJSONList :: Value -> Parser [ZonedTime] #
FromJSON LocalTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser LocalTime # parseJSONList :: Value -> Parser [LocalTime] #
FromJSON TimeOfDay
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser TimeOfDay # parseJSONList :: Value -> Parser [TimeOfDay] #
FromJSON CalendarDiffTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser CalendarDiffTime # parseJSONList :: Value -> Parser [CalendarDiffTime] #
FromJSON SystemTime
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser SystemTime # parseJSONList :: Value -> Parser [SystemTime] #
FromJSON NominalDiffTime	This instance includes a bounds check to prevent maliciously large inputs to fill up the memory of the target system. You can newtype `Scientific` and provide your own instance using `withScientific` if you want to allow larger inputs.
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser NominalDiffTime # parseJSONList :: Value -> Parser [NominalDiffTime] #
FromJSON DiffTime	This instance includes a bounds check to prevent maliciously large inputs to fill up the memory of the target system. You can newtype `Scientific` and provide your own instance using `withScientific` if you want to allow larger inputs.
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser DiffTime # parseJSONList :: Value -> Parser [DiffTime] #
FromJSON DayOfWeek
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser DayOfWeek # parseJSONList :: Value -> Parser [DayOfWeek] #
FromJSON Day
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Day # parseJSONList :: Value -> Parser [Day] #
FromJSON CalendarDiffDays
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser CalendarDiffDays # parseJSONList :: Value -> Parser [CalendarDiffDays] #
FromJSON QuarterOfYear
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser QuarterOfYear # parseJSONList :: Value -> Parser [QuarterOfYear] #
FromJSON Quarter
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Quarter # parseJSONList :: Value -> Parser [Quarter] #
FromJSON Month
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser Month # parseJSONList :: Value -> Parser [Month] #
FromJSON UUID
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser UUID # parseJSONList :: Value -> Parser [UUID] #
FromJSON a => FromJSON [a]
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser [a] # parseJSONList :: Value -> Parser [[a]] #
FromJSON a => FromJSON (Maybe a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Maybe a) # parseJSONList :: Value -> Parser [Maybe a] #
(FromJSON a, Integral a) => FromJSON (Ratio a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Ratio a) # parseJSONList :: Value -> Parser [Ratio a] #
FromJSON v => FromJSON (KeyMap v)	Since: aeson-2.0.1.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (KeyMap v) # parseJSONList :: Value -> Parser [KeyMap v] #
FromJSON a => FromJSON (Min a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Min a) # parseJSONList :: Value -> Parser [Min a] #
FromJSON a => FromJSON (Max a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Max a) # parseJSONList :: Value -> Parser [Max a] #
FromJSON a => FromJSON (First a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (First a) # parseJSONList :: Value -> Parser [First a] #
FromJSON a => FromJSON (Last a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Last a) # parseJSONList :: Value -> Parser [Last a] #
FromJSON a => FromJSON (WrappedMonoid a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (WrappedMonoid a) # parseJSONList :: Value -> Parser [WrappedMonoid a] #
FromJSON a => FromJSON (Option a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Option a) # parseJSONList :: Value -> Parser [Option a] #
FromJSON a => FromJSON (Identity a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Identity a) # parseJSONList :: Value -> Parser [Identity a] #
FromJSON a => FromJSON (First a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (First a) # parseJSONList :: Value -> Parser [First a] #
FromJSON a => FromJSON (Last a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Last a) # parseJSONList :: Value -> Parser [Last a] #
FromJSON a => FromJSON (Dual a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Dual a) # parseJSONList :: Value -> Parser [Dual a] #
FromJSON a => FromJSON (NonEmpty a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (NonEmpty a) # parseJSONList :: Value -> Parser [NonEmpty a] #
FromJSON a => FromJSON (IntMap a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (IntMap a) # parseJSONList :: Value -> Parser [IntMap a] #
FromJSON v => FromJSON (Tree v)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Tree v) # parseJSONList :: Value -> Parser [Tree v] #
FromJSON a => FromJSON (Seq a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Seq a) # parseJSONList :: Value -> Parser [Seq a] #
(Ord a, FromJSON a) => FromJSON (Set a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Set a) # parseJSONList :: Value -> Parser [Set a] #
FromJSON1 f => FromJSON (Fix f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Fix f) # parseJSONList :: Value -> Parser [Fix f] #
(FromJSON1 f, Functor f) => FromJSON (Mu f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Mu f) # parseJSONList :: Value -> Parser [Mu f] #
(FromJSON1 f, Functor f) => FromJSON (Nu f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Nu f) # parseJSONList :: Value -> Parser [Nu f] #
FromJSON a => FromJSON (DNonEmpty a)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (DNonEmpty a) # parseJSONList :: Value -> Parser [DNonEmpty a] #
FromJSON a => FromJSON (DList a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (DList a) # parseJSONList :: Value -> Parser [DList a] #
(Prim a, FromJSON a) => FromJSON (PrimArray a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (PrimArray a) # parseJSONList :: Value -> Parser [PrimArray a] #
FromJSON a => FromJSON (SmallArray a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (SmallArray a) # parseJSONList :: Value -> Parser [SmallArray a] #
FromJSON a => FromJSON (Array a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Array a) # parseJSONList :: Value -> Parser [Array a] #
FromJSON a => FromJSON (Maybe a)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Maybe a) # parseJSONList :: Value -> Parser [Maybe a] #
(Eq a, Hashable a, FromJSON a) => FromJSON (HashSet a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (HashSet a) # parseJSONList :: Value -> Parser [HashSet a] #
(Vector Vector a, FromJSON a) => FromJSON (Vector a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Vector a) # parseJSONList :: Value -> Parser [Vector a] #
(Storable a, FromJSON a) => FromJSON (Vector a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Vector a) # parseJSONList :: Value -> Parser [Vector a] #
(Prim a, FromJSON a) => FromJSON (Vector a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Vector a) # parseJSONList :: Value -> Parser [Vector a] #
FromJSON a => FromJSON (Vector a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Vector a) # parseJSONList :: Value -> Parser [Vector a] #
(FromJSON a, FromJSON b) => FromJSON (Either a b)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Either a b) # parseJSONList :: Value -> Parser [Either a b] #
(FromJSON a, FromJSON b) => FromJSON (a, b)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b) # parseJSONList :: Value -> Parser [(a, b)] #
(FromJSONKey k, Ord k, FromJSON v) => FromJSON (Map k v)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Map k v) # parseJSONList :: Value -> Parser [Map k v] #
(FromJSON v, FromJSONKey k, Eq k, Hashable k) => FromJSON (HashMap k v)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (HashMap k v) # parseJSONList :: Value -> Parser [HashMap k v] #
HasResolution a => FromJSON (Fixed a)	This instance includes a bounds check to prevent maliciously large inputs to fill up the memory of the target system. You can newtype `Scientific` and provide your own instance using `withScientific` if you want to allow larger inputs.
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Fixed a) # parseJSONList :: Value -> Parser [Fixed a] #
FromJSON (Proxy a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Proxy a) # parseJSONList :: Value -> Parser [Proxy a] #
(FromJSON a, FromJSON b) => FromJSON (These a b)	Since: aeson-1.5.1.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (These a b) # parseJSONList :: Value -> Parser [These a b] #
(FromJSON a, FromJSON b) => FromJSON (Pair a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Pair a b) # parseJSONList :: Value -> Parser [Pair a b] #
(FromJSON a, FromJSON b) => FromJSON (These a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (These a b) # parseJSONList :: Value -> Parser [These a b] #
(FromJSON a, FromJSON b) => FromJSON (Either a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Either a b) # parseJSONList :: Value -> Parser [Either a b] #
(FromJSON a, FromJSON b, FromJSON c) => FromJSON (a, b, c)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c) # parseJSONList :: Value -> Parser [(a, b, c)] #
FromJSON a => FromJSON (Const a b)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Const a b) # parseJSONList :: Value -> Parser [Const a b] #
FromJSON b => FromJSON (Tagged a b)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Tagged a b) # parseJSONList :: Value -> Parser [Tagged a b] #
(FromJSON1 f, FromJSON1 g, FromJSON a) => FromJSON (These1 f g a)	Since: aeson-1.5.1.0
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (These1 f g a) # parseJSONList :: Value -> Parser [These1 f g a] #
(AesonOptions t, Generic a, GFromJSON Zero (Rep a)) => FromJSON (CustomJSON t a) Source #
Instance details Defined in Deriving.Aeson Methods parseJSON :: Value -> Parser (CustomJSON t a) # parseJSONList :: Value -> Parser [CustomJSON t a] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d) => FromJSON (a, b, c, d)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d) # parseJSONList :: Value -> Parser [(a, b, c, d)] #
(FromJSON1 f, FromJSON1 g, FromJSON a) => FromJSON (Product f g a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Product f g a) # parseJSONList :: Value -> Parser [Product f g a] #
(FromJSON1 f, FromJSON1 g, FromJSON a) => FromJSON (Sum f g a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Sum f g a) # parseJSONList :: Value -> Parser [Sum f g a] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e) => FromJSON (a, b, c, d, e)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e) # parseJSONList :: Value -> Parser [(a, b, c, d, e)] #
(FromJSON1 f, FromJSON1 g, FromJSON a) => FromJSON (Compose f g a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Compose f g a) # parseJSONList :: Value -> Parser [Compose f g a] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f) => FromJSON (a, b, c, d, e, f)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g) => FromJSON (a, b, c, d, e, f, g)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h) => FromJSON (a, b, c, d, e, f, g, h)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i) => FromJSON (a, b, c, d, e, f, g, h, i)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j) => FromJSON (a, b, c, d, e, f, g, h, i, j)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k) => FromJSON (a, b, c, d, e, f, g, h, i, j, k)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j, k) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j, k)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l) => FromJSON (a, b, c, d, e, f, g, h, i, j, k, l)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j, k, l) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j, k, l)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l, FromJSON m) => FromJSON (a, b, c, d, e, f, g, h, i, j, k, l, m)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j, k, l, m) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j, k, l, m)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l, FromJSON m, FromJSON n) => FromJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j, k, l, m, n) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j, k, l, m, n)] #
(FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l, FromJSON m, FromJSON n, FromJSON o) => FromJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) # parseJSONList :: Value -> Parser [(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)] #

class ToJSON a #

A type that can be converted to JSON.

Instances in general must specify toJSON and should (but don't need to) specify toEncoding.

An example type and instance:

-- Allow ourselves to write Text literals.
{-# LANGUAGE OverloadedStrings #-}

data Coord = Coord { x :: Double, y :: Double }

instance ToJSON Coord where
  toJSON (Coord x y) = object ["x" .= x, "y" .= y]

  toEncoding (Coord x y) = pairs ("x" .= x <> "y" .= y)

Instead of manually writing your ToJSON instance, there are two options to do it automatically:

Data.Aeson.TH provides Template Haskell functions which will derive an instance at compile time. The generated instance is optimized for your type so it will probably be more efficient than the following option.
The compiler can provide a default generic implementation for toJSON.

To use the second, simply add a deriving Generic clause to your datatype and declare a ToJSON instance. If you require nothing other than defaultOptions, it is sufficient to write (and this is the only alternative where the default toJSON implementation is sufficient):

{-# LANGUAGE DeriveGeneric #-}

import GHC.Generics

data Coord = Coord { x :: Double, y :: Double } deriving Generic

instance ToJSON Coord where
    toEncoding = genericToEncoding defaultOptions

If on the other hand you wish to customize the generic decoding, you have to implement both methods:

customOptions = defaultOptions
                { fieldLabelModifier = map toUpper
                }

instance ToJSON Coord where
    toJSON     = genericToJSON customOptions
    toEncoding = genericToEncoding customOptions

Previous versions of this library only had the toJSON method. Adding toEncoding had two reasons:

toEncoding is more efficient for the common case that the output of toJSON is directly serialized to a ByteString. Further, expressing either method in terms of the other would be non-optimal.
The choice of defaults allows a smooth transition for existing users: Existing instances that do not define toEncoding still compile and have the correct semantics. This is ensured by making the default implementation of toEncoding use toJSON. This produces correct results, but since it performs an intermediate conversion to a Value, it will be less efficient than directly emitting an Encoding. (this also means that specifying nothing more than instance ToJSON Coord would be sufficient as a generically decoding instance, but there probably exists no good reason to not specify toEncoding in new instances.)

Instances

Instances details

ToJSON Bool
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Bool -> Value # toEncoding :: Bool -> Encoding # toJSONList :: [Bool] -> Value # toEncodingList :: [Bool] -> Encoding #
ToJSON Char
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Char -> Value # toEncoding :: Char -> Encoding # toJSONList :: [Char] -> Value # toEncodingList :: [Char] -> Encoding #
ToJSON Double
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Double -> Value # toEncoding :: Double -> Encoding # toJSONList :: [Double] -> Value # toEncodingList :: [Double] -> Encoding #
ToJSON Float
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Float -> Value # toEncoding :: Float -> Encoding # toJSONList :: [Float] -> Value # toEncodingList :: [Float] -> Encoding #
ToJSON Int
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Int -> Value # toEncoding :: Int -> Encoding # toJSONList :: [Int] -> Value # toEncodingList :: [Int] -> Encoding #
ToJSON Int8
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Int8 -> Value # toEncoding :: Int8 -> Encoding # toJSONList :: [Int8] -> Value # toEncodingList :: [Int8] -> Encoding #
ToJSON Int16
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Int16 -> Value # toEncoding :: Int16 -> Encoding # toJSONList :: [Int16] -> Value # toEncodingList :: [Int16] -> Encoding #
ToJSON Int32
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Int32 -> Value # toEncoding :: Int32 -> Encoding # toJSONList :: [Int32] -> Value # toEncodingList :: [Int32] -> Encoding #
ToJSON Int64
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Int64 -> Value # toEncoding :: Int64 -> Encoding # toJSONList :: [Int64] -> Value # toEncodingList :: [Int64] -> Encoding #
ToJSON Integer
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Integer -> Value # toEncoding :: Integer -> Encoding # toJSONList :: [Integer] -> Value # toEncodingList :: [Integer] -> Encoding #
ToJSON Natural
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Natural -> Value # toEncoding :: Natural -> Encoding # toJSONList :: [Natural] -> Value # toEncodingList :: [Natural] -> Encoding #
ToJSON Ordering
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Ordering -> Value # toEncoding :: Ordering -> Encoding # toJSONList :: [Ordering] -> Value # toEncodingList :: [Ordering] -> Encoding #
ToJSON Word
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Word -> Value # toEncoding :: Word -> Encoding # toJSONList :: [Word] -> Value # toEncodingList :: [Word] -> Encoding #
ToJSON Word8
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Word8 -> Value # toEncoding :: Word8 -> Encoding # toJSONList :: [Word8] -> Value # toEncodingList :: [Word8] -> Encoding #
ToJSON Word16
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Word16 -> Value # toEncoding :: Word16 -> Encoding # toJSONList :: [Word16] -> Value # toEncodingList :: [Word16] -> Encoding #
ToJSON Word32
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Word32 -> Value # toEncoding :: Word32 -> Encoding # toJSONList :: [Word32] -> Value # toEncodingList :: [Word32] -> Encoding #
ToJSON Word64
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Word64 -> Value # toEncoding :: Word64 -> Encoding # toJSONList :: [Word64] -> Value # toEncodingList :: [Word64] -> Encoding #
ToJSON ()
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: () -> Value # toEncoding :: () -> Encoding # toJSONList :: [()] -> Value # toEncodingList :: [()] -> Encoding #
ToJSON Scientific
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Scientific -> Value # toEncoding :: Scientific -> Encoding # toJSONList :: [Scientific] -> Value # toEncodingList :: [Scientific] -> Encoding #
ToJSON UTCTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: UTCTime -> Value # toEncoding :: UTCTime -> Encoding # toJSONList :: [UTCTime] -> Value # toEncodingList :: [UTCTime] -> Encoding #
ToJSON Text
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Text -> Value # toEncoding :: Text -> Encoding # toJSONList :: [Text] -> Value # toEncodingList :: [Text] -> Encoding #
ToJSON Value
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Value -> Value # toEncoding :: Value -> Encoding # toJSONList :: [Value] -> Value # toEncodingList :: [Value] -> Encoding #
ToJSON DotNetTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: DotNetTime -> Value # toEncoding :: DotNetTime -> Encoding # toJSONList :: [DotNetTime] -> Value # toEncodingList :: [DotNetTime] -> Encoding #
ToJSON Key
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Key -> Value # toEncoding :: Key -> Encoding # toJSONList :: [Key] -> Value # toEncodingList :: [Key] -> Encoding #
ToJSON Text
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Text -> Value # toEncoding :: Text -> Encoding # toJSONList :: [Text] -> Value # toEncodingList :: [Text] -> Encoding #
ToJSON Number
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Number -> Value # toEncoding :: Number -> Encoding # toJSONList :: [Number] -> Value # toEncodingList :: [Number] -> Encoding #
ToJSON Void
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Void -> Value # toEncoding :: Void -> Encoding # toJSONList :: [Void] -> Value # toEncodingList :: [Void] -> Encoding #
ToJSON Version
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Version -> Value # toEncoding :: Version -> Encoding # toJSONList :: [Version] -> Value # toEncodingList :: [Version] -> Encoding #
ToJSON CTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: CTime -> Value # toEncoding :: CTime -> Encoding # toJSONList :: [CTime] -> Value # toEncodingList :: [CTime] -> Encoding #
ToJSON IntSet
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: IntSet -> Value # toEncoding :: IntSet -> Encoding # toJSONList :: [IntSet] -> Value # toEncodingList :: [IntSet] -> Encoding #
ToJSON ZonedTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: ZonedTime -> Value # toEncoding :: ZonedTime -> Encoding # toJSONList :: [ZonedTime] -> Value # toEncodingList :: [ZonedTime] -> Encoding #
ToJSON LocalTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: LocalTime -> Value # toEncoding :: LocalTime -> Encoding # toJSONList :: [LocalTime] -> Value # toEncodingList :: [LocalTime] -> Encoding #
ToJSON TimeOfDay
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: TimeOfDay -> Value # toEncoding :: TimeOfDay -> Encoding # toJSONList :: [TimeOfDay] -> Value # toEncodingList :: [TimeOfDay] -> Encoding #
ToJSON CalendarDiffTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: CalendarDiffTime -> Value # toEncoding :: CalendarDiffTime -> Encoding # toJSONList :: [CalendarDiffTime] -> Value # toEncodingList :: [CalendarDiffTime] -> Encoding #
ToJSON SystemTime	Encoded as number
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: SystemTime -> Value # toEncoding :: SystemTime -> Encoding # toJSONList :: [SystemTime] -> Value # toEncodingList :: [SystemTime] -> Encoding #
ToJSON NominalDiffTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: NominalDiffTime -> Value # toEncoding :: NominalDiffTime -> Encoding # toJSONList :: [NominalDiffTime] -> Value # toEncodingList :: [NominalDiffTime] -> Encoding #
ToJSON DiffTime
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: DiffTime -> Value # toEncoding :: DiffTime -> Encoding # toJSONList :: [DiffTime] -> Value # toEncodingList :: [DiffTime] -> Encoding #
ToJSON DayOfWeek
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: DayOfWeek -> Value # toEncoding :: DayOfWeek -> Encoding # toJSONList :: [DayOfWeek] -> Value # toEncodingList :: [DayOfWeek] -> Encoding #
ToJSON Day
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Day -> Value # toEncoding :: Day -> Encoding # toJSONList :: [Day] -> Value # toEncodingList :: [Day] -> Encoding #
ToJSON CalendarDiffDays
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: CalendarDiffDays -> Value # toEncoding :: CalendarDiffDays -> Encoding # toJSONList :: [CalendarDiffDays] -> Value # toEncodingList :: [CalendarDiffDays] -> Encoding #
ToJSON QuarterOfYear
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: QuarterOfYear -> Value # toEncoding :: QuarterOfYear -> Encoding # toJSONList :: [QuarterOfYear] -> Value # toEncodingList :: [QuarterOfYear] -> Encoding #
ToJSON Quarter
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Quarter -> Value # toEncoding :: Quarter -> Encoding # toJSONList :: [Quarter] -> Value # toEncodingList :: [Quarter] -> Encoding #
ToJSON Month
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Month -> Value # toEncoding :: Month -> Encoding # toJSONList :: [Month] -> Value # toEncodingList :: [Month] -> Encoding #
ToJSON UUID
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: UUID -> Value # toEncoding :: UUID -> Encoding # toJSONList :: [UUID] -> Value # toEncodingList :: [UUID] -> Encoding #
ToJSON a => ToJSON [a]
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: [a] -> Value # toEncoding :: [a] -> Encoding # toJSONList :: [[a]] -> Value # toEncodingList :: [[a]] -> Encoding #
ToJSON a => ToJSON (Maybe a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Maybe a -> Value # toEncoding :: Maybe a -> Encoding # toJSONList :: [Maybe a] -> Value # toEncodingList :: [Maybe a] -> Encoding #
(ToJSON a, Integral a) => ToJSON (Ratio a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Ratio a -> Value # toEncoding :: Ratio a -> Encoding # toJSONList :: [Ratio a] -> Value # toEncodingList :: [Ratio a] -> Encoding #
ToJSON v => ToJSON (KeyMap v)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: KeyMap v -> Value # toEncoding :: KeyMap v -> Encoding # toJSONList :: [KeyMap v] -> Value # toEncodingList :: [KeyMap v] -> Encoding #
ToJSON a => ToJSON (Min a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Min a -> Value # toEncoding :: Min a -> Encoding # toJSONList :: [Min a] -> Value # toEncodingList :: [Min a] -> Encoding #
ToJSON a => ToJSON (Max a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Max a -> Value # toEncoding :: Max a -> Encoding # toJSONList :: [Max a] -> Value # toEncodingList :: [Max a] -> Encoding #
ToJSON a => ToJSON (First a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: First a -> Value # toEncoding :: First a -> Encoding # toJSONList :: [First a] -> Value # toEncodingList :: [First a] -> Encoding #
ToJSON a => ToJSON (Last a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Last a -> Value # toEncoding :: Last a -> Encoding # toJSONList :: [Last a] -> Value # toEncodingList :: [Last a] -> Encoding #
ToJSON a => ToJSON (WrappedMonoid a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: WrappedMonoid a -> Value # toEncoding :: WrappedMonoid a -> Encoding # toJSONList :: [WrappedMonoid a] -> Value # toEncodingList :: [WrappedMonoid a] -> Encoding #
ToJSON a => ToJSON (Option a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Option a -> Value # toEncoding :: Option a -> Encoding # toJSONList :: [Option a] -> Value # toEncodingList :: [Option a] -> Encoding #
ToJSON a => ToJSON (Identity a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Identity a -> Value # toEncoding :: Identity a -> Encoding # toJSONList :: [Identity a] -> Value # toEncodingList :: [Identity a] -> Encoding #
ToJSON a => ToJSON (First a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: First a -> Value # toEncoding :: First a -> Encoding # toJSONList :: [First a] -> Value # toEncodingList :: [First a] -> Encoding #
ToJSON a => ToJSON (Last a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Last a -> Value # toEncoding :: Last a -> Encoding # toJSONList :: [Last a] -> Value # toEncodingList :: [Last a] -> Encoding #
ToJSON a => ToJSON (Dual a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Dual a -> Value # toEncoding :: Dual a -> Encoding # toJSONList :: [Dual a] -> Value # toEncodingList :: [Dual a] -> Encoding #
ToJSON a => ToJSON (NonEmpty a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: NonEmpty a -> Value # toEncoding :: NonEmpty a -> Encoding # toJSONList :: [NonEmpty a] -> Value # toEncodingList :: [NonEmpty a] -> Encoding #
ToJSON a => ToJSON (IntMap a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: IntMap a -> Value # toEncoding :: IntMap a -> Encoding # toJSONList :: [IntMap a] -> Value # toEncodingList :: [IntMap a] -> Encoding #
ToJSON v => ToJSON (Tree v)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Tree v -> Value # toEncoding :: Tree v -> Encoding # toJSONList :: [Tree v] -> Value # toEncodingList :: [Tree v] -> Encoding #
ToJSON a => ToJSON (Seq a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Seq a -> Value # toEncoding :: Seq a -> Encoding # toJSONList :: [Seq a] -> Value # toEncodingList :: [Seq a] -> Encoding #
ToJSON a => ToJSON (Set a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Set a -> Value # toEncoding :: Set a -> Encoding # toJSONList :: [Set a] -> Value # toEncodingList :: [Set a] -> Encoding #
ToJSON1 f => ToJSON (Fix f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Fix f -> Value # toEncoding :: Fix f -> Encoding # toJSONList :: [Fix f] -> Value # toEncodingList :: [Fix f] -> Encoding #
(ToJSON1 f, Functor f) => ToJSON (Mu f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Mu f -> Value # toEncoding :: Mu f -> Encoding # toJSONList :: [Mu f] -> Value # toEncodingList :: [Mu f] -> Encoding #
(ToJSON1 f, Functor f) => ToJSON (Nu f)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Nu f -> Value # toEncoding :: Nu f -> Encoding # toJSONList :: [Nu f] -> Value # toEncodingList :: [Nu f] -> Encoding #
ToJSON a => ToJSON (DNonEmpty a)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: DNonEmpty a -> Value # toEncoding :: DNonEmpty a -> Encoding # toJSONList :: [DNonEmpty a] -> Value # toEncodingList :: [DNonEmpty a] -> Encoding #
ToJSON a => ToJSON (DList a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: DList a -> Value # toEncoding :: DList a -> Encoding # toJSONList :: [DList a] -> Value # toEncodingList :: [DList a] -> Encoding #
(Prim a, ToJSON a) => ToJSON (PrimArray a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: PrimArray a -> Value # toEncoding :: PrimArray a -> Encoding # toJSONList :: [PrimArray a] -> Value # toEncodingList :: [PrimArray a] -> Encoding #
ToJSON a => ToJSON (SmallArray a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: SmallArray a -> Value # toEncoding :: SmallArray a -> Encoding # toJSONList :: [SmallArray a] -> Value # toEncodingList :: [SmallArray a] -> Encoding #
ToJSON a => ToJSON (Array a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Array a -> Value # toEncoding :: Array a -> Encoding # toJSONList :: [Array a] -> Value # toEncodingList :: [Array a] -> Encoding #
ToJSON a => ToJSON (Maybe a)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Maybe a -> Value # toEncoding :: Maybe a -> Encoding # toJSONList :: [Maybe a] -> Value # toEncodingList :: [Maybe a] -> Encoding #
ToJSON a => ToJSON (HashSet a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: HashSet a -> Value # toEncoding :: HashSet a -> Encoding # toJSONList :: [HashSet a] -> Value # toEncodingList :: [HashSet a] -> Encoding #
(Vector Vector a, ToJSON a) => ToJSON (Vector a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Vector a -> Value # toEncoding :: Vector a -> Encoding # toJSONList :: [Vector a] -> Value # toEncodingList :: [Vector a] -> Encoding #
(Storable a, ToJSON a) => ToJSON (Vector a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Vector a -> Value # toEncoding :: Vector a -> Encoding # toJSONList :: [Vector a] -> Value # toEncodingList :: [Vector a] -> Encoding #
(Prim a, ToJSON a) => ToJSON (Vector a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Vector a -> Value # toEncoding :: Vector a -> Encoding # toJSONList :: [Vector a] -> Value # toEncodingList :: [Vector a] -> Encoding #
ToJSON a => ToJSON (Vector a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Vector a -> Value # toEncoding :: Vector a -> Encoding # toJSONList :: [Vector a] -> Value # toEncodingList :: [Vector a] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (Either a b)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Either a b -> Value # toEncoding :: Either a b -> Encoding # toJSONList :: [Either a b] -> Value # toEncodingList :: [Either a b] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (a, b)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b) -> Value # toEncoding :: (a, b) -> Encoding # toJSONList :: [(a, b)] -> Value # toEncodingList :: [(a, b)] -> Encoding #
(ToJSON v, ToJSONKey k) => ToJSON (Map k v)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Map k v -> Value # toEncoding :: Map k v -> Encoding # toJSONList :: [Map k v] -> Value # toEncodingList :: [Map k v] -> Encoding #
(ToJSON v, ToJSONKey k) => ToJSON (HashMap k v)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: HashMap k v -> Value # toEncoding :: HashMap k v -> Encoding # toJSONList :: [HashMap k v] -> Value # toEncodingList :: [HashMap k v] -> Encoding #
HasResolution a => ToJSON (Fixed a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Fixed a -> Value # toEncoding :: Fixed a -> Encoding # toJSONList :: [Fixed a] -> Value # toEncodingList :: [Fixed a] -> Encoding #
ToJSON (Proxy a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Proxy a -> Value # toEncoding :: Proxy a -> Encoding # toJSONList :: [Proxy a] -> Value # toEncodingList :: [Proxy a] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (These a b)	Since: aeson-1.5.1.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: These a b -> Value # toEncoding :: These a b -> Encoding # toJSONList :: [These a b] -> Value # toEncodingList :: [These a b] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (Pair a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Pair a b -> Value # toEncoding :: Pair a b -> Encoding # toJSONList :: [Pair a b] -> Value # toEncodingList :: [Pair a b] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (These a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: These a b -> Value # toEncoding :: These a b -> Encoding # toJSONList :: [These a b] -> Value # toEncodingList :: [These a b] -> Encoding #
(ToJSON a, ToJSON b) => ToJSON (Either a b)	Since: aeson-1.5.3.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Either a b -> Value # toEncoding :: Either a b -> Encoding # toJSONList :: [Either a b] -> Value # toEncodingList :: [Either a b] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c) => ToJSON (a, b, c)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c) -> Value # toEncoding :: (a, b, c) -> Encoding # toJSONList :: [(a, b, c)] -> Value # toEncodingList :: [(a, b, c)] -> Encoding #
ToJSON a => ToJSON (Const a b)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Const a b -> Value # toEncoding :: Const a b -> Encoding # toJSONList :: [Const a b] -> Value # toEncodingList :: [Const a b] -> Encoding #
ToJSON b => ToJSON (Tagged a b)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Tagged a b -> Value # toEncoding :: Tagged a b -> Encoding # toJSONList :: [Tagged a b] -> Value # toEncodingList :: [Tagged a b] -> Encoding #
(ToJSON1 f, ToJSON1 g, ToJSON a) => ToJSON (These1 f g a)	Since: aeson-1.5.1.0
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: These1 f g a -> Value # toEncoding :: These1 f g a -> Encoding # toJSONList :: [These1 f g a] -> Value # toEncodingList :: [These1 f g a] -> Encoding #
(AesonOptions t, Generic a, GToJSON Zero (Rep a), GToEncoding Zero (Rep a)) => ToJSON (CustomJSON t a) Source #
Instance details Defined in Deriving.Aeson Methods toJSON :: CustomJSON t a -> Value # toEncoding :: CustomJSON t a -> Encoding # toJSONList :: [CustomJSON t a] -> Value # toEncodingList :: [CustomJSON t a] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d) => ToJSON (a, b, c, d)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d) -> Value # toEncoding :: (a, b, c, d) -> Encoding # toJSONList :: [(a, b, c, d)] -> Value # toEncodingList :: [(a, b, c, d)] -> Encoding #
(ToJSON1 f, ToJSON1 g, ToJSON a) => ToJSON (Product f g a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Product f g a -> Value # toEncoding :: Product f g a -> Encoding # toJSONList :: [Product f g a] -> Value # toEncodingList :: [Product f g a] -> Encoding #
(ToJSON1 f, ToJSON1 g, ToJSON a) => ToJSON (Sum f g a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Sum f g a -> Value # toEncoding :: Sum f g a -> Encoding # toJSONList :: [Sum f g a] -> Value # toEncodingList :: [Sum f g a] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e) => ToJSON (a, b, c, d, e)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e) -> Value # toEncoding :: (a, b, c, d, e) -> Encoding # toJSONList :: [(a, b, c, d, e)] -> Value # toEncodingList :: [(a, b, c, d, e)] -> Encoding #
(ToJSON1 f, ToJSON1 g, ToJSON a) => ToJSON (Compose f g a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Compose f g a -> Value # toEncoding :: Compose f g a -> Encoding # toJSONList :: [Compose f g a] -> Value # toEncodingList :: [Compose f g a] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f) => ToJSON (a, b, c, d, e, f)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f) -> Value # toEncoding :: (a, b, c, d, e, f) -> Encoding # toJSONList :: [(a, b, c, d, e, f)] -> Value # toEncodingList :: [(a, b, c, d, e, f)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g) => ToJSON (a, b, c, d, e, f, g)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g) -> Value # toEncoding :: (a, b, c, d, e, f, g) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h) => ToJSON (a, b, c, d, e, f, g, h)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h) -> Value # toEncoding :: (a, b, c, d, e, f, g, h) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i) => ToJSON (a, b, c, d, e, f, g, h, i)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j) => ToJSON (a, b, c, d, e, f, g, h, i, j)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k) => ToJSON (a, b, c, d, e, f, g, h, i, j, k)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j, k) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j, k) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j, k)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j, k)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l) => ToJSON (a, b, c, d, e, f, g, h, i, j, k, l)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j, k, l) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j, k, l) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j, k, l)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j, k, l)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l, ToJSON m) => ToJSON (a, b, c, d, e, f, g, h, i, j, k, l, m)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l, ToJSON m, ToJSON n) => ToJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m, n)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m, n)] -> Encoding #
(ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l, ToJSON m, ToJSON n, ToJSON o) => ToJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> Value # toEncoding :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> Encoding # toJSONList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)] -> Value # toEncodingList :: [(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)] -> Encoding #

class Generic a #

Representable types of kind *. This class is derivable in GHC with the DeriveGeneric flag on.

A Generic instance must satisfy the following laws:

from . to ≡ id
to . from ≡ id

Minimal complete definition

from, to

Instances

Instances details

Generic Bool	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep Bool :: Type -> Type # Methods from :: Bool -> Rep Bool x # to :: Rep Bool x -> Bool #
Generic Ordering	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep Ordering :: Type -> Type # Methods from :: Ordering -> Rep Ordering x # to :: Rep Ordering x -> Ordering #
Generic ()	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep () :: Type -> Type # Methods from :: () -> Rep () x # to :: Rep () x -> () #
Generic Value
Instance details Defined in Data.Aeson.Types.Internal Associated Types type Rep Value :: Type -> Type # Methods from :: Value -> Rep Value x # to :: Rep Value x -> Value #
Generic ExitCode
Instance details Defined in GHC.IO.Exception Associated Types type Rep ExitCode :: Type -> Type # Methods from :: ExitCode -> Rep ExitCode x # to :: Rep ExitCode x -> ExitCode #
Generic Fixity	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep Fixity :: Type -> Type # Methods from :: Fixity -> Rep Fixity x # to :: Rep Fixity x -> Fixity #
Generic Associativity	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep Associativity :: Type -> Type # Methods from :: Associativity -> Rep Associativity x # to :: Rep Associativity x -> Associativity #
Generic SourceUnpackedness	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep SourceUnpackedness :: Type -> Type # Methods from :: SourceUnpackedness -> Rep SourceUnpackedness x # to :: Rep SourceUnpackedness x -> SourceUnpackedness #
Generic SourceStrictness	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep SourceStrictness :: Type -> Type # Methods from :: SourceStrictness -> Rep SourceStrictness x # to :: Rep SourceStrictness x -> SourceStrictness #
Generic DecidedStrictness	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep DecidedStrictness :: Type -> Type # Methods from :: DecidedStrictness -> Rep DecidedStrictness x # to :: Rep DecidedStrictness x -> DecidedStrictness #
Generic [a]	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep [a] :: Type -> Type # Methods from :: [a] -> Rep [a] x # to :: Rep [a] x -> [a] #
Generic (Maybe a)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Maybe a) :: Type -> Type # Methods from :: Maybe a -> Rep (Maybe a) x # to :: Rep (Maybe a) x -> Maybe a #
Generic (Par1 p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Par1 p) :: Type -> Type # Methods from :: Par1 p -> Rep (Par1 p) x # to :: Rep (Par1 p) x -> Par1 p #
Generic (Down a)	Since: base-4.12.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Down a) :: Type -> Type # Methods from :: Down a -> Rep (Down a) x # to :: Rep (Down a) x -> Down a #
Generic (NonEmpty a)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (NonEmpty a) :: Type -> Type # Methods from :: NonEmpty a -> Rep (NonEmpty a) x # to :: Rep (NonEmpty a) x -> NonEmpty a #
Generic (Either a b)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Either a b) :: Type -> Type # Methods from :: Either a b -> Rep (Either a b) x # to :: Rep (Either a b) x -> Either a b #
Generic (V1 p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (V1 p) :: Type -> Type # Methods from :: V1 p -> Rep (V1 p) x # to :: Rep (V1 p) x -> V1 p #
Generic (U1 p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (U1 p) :: Type -> Type # Methods from :: U1 p -> Rep (U1 p) x # to :: Rep (U1 p) x -> U1 p #
Generic (a, b)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b) :: Type -> Type # Methods from :: (a, b) -> Rep (a, b) x # to :: Rep (a, b) x -> (a, b) #
Generic (Proxy t)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Proxy t) :: Type -> Type # Methods from :: Proxy t -> Rep (Proxy t) x # to :: Rep (Proxy t) x -> Proxy t #
Generic (Rec1 f p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Rec1 f p) :: Type -> Type # Methods from :: Rec1 f p -> Rep (Rec1 f p) x # to :: Rep (Rec1 f p) x -> Rec1 f p #
Generic (URec (Ptr ()) p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (URec (Ptr ()) p) :: Type -> Type # Methods from :: URec (Ptr ()) p -> Rep (URec (Ptr ()) p) x # to :: Rep (URec (Ptr ()) p) x -> URec (Ptr ()) p #
Generic (URec Char p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (URec Char p) :: Type -> Type # Methods from :: URec Char p -> Rep (URec Char p) x # to :: Rep (URec Char p) x -> URec Char p #
Generic (URec Double p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (URec Double p) :: Type -> Type # Methods from :: URec Double p -> Rep (URec Double p) x # to :: Rep (URec Double p) x -> URec Double p #
Generic (URec Float p)
Instance details Defined in GHC.Generics Associated Types type Rep (URec Float p) :: Type -> Type # Methods from :: URec Float p -> Rep (URec Float p) x # to :: Rep (URec Float p) x -> URec Float p #
Generic (URec Int p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (URec Int p) :: Type -> Type # Methods from :: URec Int p -> Rep (URec Int p) x # to :: Rep (URec Int p) x -> URec Int p #
Generic (URec Word p)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (URec Word p) :: Type -> Type # Methods from :: URec Word p -> Rep (URec Word p) x # to :: Rep (URec Word p) x -> URec Word p #
Generic (a, b, c)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b, c) :: Type -> Type # Methods from :: (a, b, c) -> Rep (a, b, c) x # to :: Rep (a, b, c) x -> (a, b, c) #
Generic (K1 i c p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (K1 i c p) :: Type -> Type # Methods from :: K1 i c p -> Rep (K1 i c p) x # to :: Rep (K1 i c p) x -> K1 i c p #
Generic ((f :+: g) p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep ((f :+: g) p) :: Type -> Type # Methods from :: (f :+: g) p -> Rep ((f :+: g) p) x # to :: Rep ((f :+: g) p) x -> (f :+: g) p #
Generic ((f :*: g) p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep ((f :: g) p) :: Type -> Type # Methods from :: (f :: g) p -> Rep ((f :: g) p) x # to :: Rep ((f :: g) p) x -> (f :*: g) p #
Generic (a, b, c, d)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b, c, d) :: Type -> Type # Methods from :: (a, b, c, d) -> Rep (a, b, c, d) x # to :: Rep (a, b, c, d) x -> (a, b, c, d) #
Generic (M1 i c f p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (M1 i c f p) :: Type -> Type # Methods from :: M1 i c f p -> Rep (M1 i c f p) x # to :: Rep (M1 i c f p) x -> M1 i c f p #
Generic ((f :.: g) p)	Since: base-4.7.0.0
Instance details Defined in GHC.Generics Associated Types type Rep ((f :.: g) p) :: Type -> Type # Methods from :: (f :.: g) p -> Rep ((f :.: g) p) x # to :: Rep ((f :.: g) p) x -> (f :.: g) p #
Generic (a, b, c, d, e)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b, c, d, e) :: Type -> Type # Methods from :: (a, b, c, d, e) -> Rep (a, b, c, d, e) x # to :: Rep (a, b, c, d, e) x -> (a, b, c, d, e) #
Generic (a, b, c, d, e, f)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b, c, d, e, f) :: Type -> Type # Methods from :: (a, b, c, d, e, f) -> Rep (a, b, c, d, e, f) x # to :: Rep (a, b, c, d, e, f) x -> (a, b, c, d, e, f) #
Generic (a, b, c, d, e, f, g)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (a, b, c, d, e, f, g) :: Type -> Type # Methods from :: (a, b, c, d, e, f, g) -> Rep (a, b, c, d, e, f, g) x # to :: Rep (a, b, c, d, e, f, g) x -> (a, b, c, d, e, f, g) #