A newtype wrapper for UTCTime that uses the same non-standard serialization format as Microsoft .NET, whose System.DateTime type is by default serialized to JSON as in the following example:

 /Date(1302547608878)/

The number represents milliseconds since the Unix epoch.

Constructors

DotNetTime

Fields

fromDotNetTime :: UTCTime

Instances

FormatTime DotNetTime

FromJSON DotNetTime

ToJSON DotNetTime

Type conversion

class FromJSON a whereSource

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

When writing an instance, use mzero or fail to make a conversion fail, e.g. if an Object is missing a required key, or the value is of the wrong type.

An example type and instance:

data Coord { x :: Double, y :: Double }
instance FromJSON Coord where
 parseJSON (Object  v) = Coord <$> 
 v .:  "x" <*> 
 v .:  "y"
-- A non-Object  value is of the wrong type, so use mzero  to fail.
 parseJSON _ = mzero

This example assumes the OverloadedStrings language option is enabled.

Methods

parseJSON :: Value -> Parser aSource

Instances

FromJSON Int

FromJSON ()

FromJSON [Char]

FromJSON a => FromJSON [a]

FromJSON (Ratio Integer)

FromJSON a => FromJSON (Maybe a)

FromJSON a => FromJSON (Dual a)

FromJSON a => FromJSON (First a)

FromJSON a => FromJSON (Last a)

(Ord a, FromJSON a) => FromJSON (Set a)

(Eq a, Hashable a, FromJSON a) => FromJSON (HashSet a)

FromJSON a => FromJSON (Vector a)

(Vector Vector a, FromJSON a) => FromJSON (Vector a)

(Storable a, FromJSON a) => FromJSON (Vector a)

(Prim a, FromJSON a) => FromJSON (Vector a)

(FromJSON a, FromJSON b) => FromJSON (Either a b)

(FromJSON a, FromJSON b) => FromJSON (a, b)

FromJSON v => FromJSON (Map String v)

FromJSON v => FromJSON (Map ByteString v)

FromJSON v => FromJSON (Map Text v)

FromJSON v => FromJSON (Map ByteString v)

FromJSON v => FromJSON (HashMap String v)

FromJSON v => FromJSON (HashMap ByteString v)

FromJSON v => FromJSON (HashMap Text v)

FromJSON v => FromJSON (HashMap ByteString v)

(FromJSON a, FromJSON b, FromJSON c) => FromJSON (a, b, c)

data Result a Source

The result of running a Parser .

Constructors

Error String

Success a

Instances

Monad Result

Eq a => Eq (Result a)

Show a => Show (Result a)

Monoid (Result a)

NFData a => NFData (Result a)

fromJSON :: FromJSON a => Value -> Result aSource

Convert a value from JSON, failing if the types do not match.

class ToJSON a whereSource

A type that can be converted to JSON.

An example type and instance:

data Coord { x :: Double, y :: Double }
instance ToJSON Coord where
 toJSON (Coord x y) = object  ["x" .=  x, "y" .=  y]

This example assumes the OverloadedStrings language option is enabled.

Methods

toJSON :: a -> Value Source

Instances

ToJSON Bool

ToJSON Char

ToJSON Double

ToJSON Float

ToJSON Int

ToJSON Int8

ToJSON Int16

ToJSON Int32

ToJSON Int64

ToJSON Integer

ToJSON Word

ToJSON Word8

ToJSON ()

ToJSON Text

ToJSON Value

ToJSON [Char]

ToJSON a => ToJSON [a]

ToJSON (Ratio Integer)

ToJSON a => ToJSON (Maybe a)

ToJSON a => ToJSON (Dual a)

ToJSON a => ToJSON (First a)

ToJSON a => ToJSON (Last a)

ToJSON a => ToJSON (Set a)

ToJSON a => ToJSON (HashSet a)

ToJSON a => ToJSON (Vector a)

(Vector Vector a, ToJSON a) => ToJSON (Vector a)

(Storable a, ToJSON a) => ToJSON (Vector a)

(Prim a, ToJSON a) => ToJSON (Vector a)

(ToJSON a, ToJSON b) => ToJSON (Either a b)

(ToJSON a, ToJSON b) => ToJSON (a, b)

ToJSON v => ToJSON (Map String v)

ToJSON v => ToJSON (Map ByteString v)

ToJSON v => ToJSON (Map Text v)

ToJSON v => ToJSON (Map ByteString v)

ToJSON v => ToJSON (HashMap String v)

ToJSON v => ToJSON (HashMap ByteString v)

ToJSON v => ToJSON (HashMap Text v)

ToJSON v => ToJSON (HashMap ByteString v)

(ToJSON a, ToJSON b, ToJSON c) => ToJSON (a, b, c)

Constructors and accessors

(.=) :: ToJSON a => Text -> a -> Pair Source

Construct a Pair from a key and a value.

(.:) :: FromJSON a => Object -> Text -> Parser aSource

Retrieve the value associated with the given key of an Object . The result is empty if the key is not present or the value cannot be converted to the desired type.

This accessor is appropriate if the key and value must be present in an object for it to be valid. If the key and value are optional, use '(.:?)' instead.

(.:?) :: FromJSON a => Object -> Text -> Parser (Maybe a)Source

Retrieve the value associated with the given key of an Object . The result is Nothing if the key is not present, or empty if the value cannot be converted to the desired type.

This accessor is most useful if the key and value can be absent from an object without affecting its validity. If the key and value are mandatory, use '(.:)' instead.

object :: [Pair] -> Value Source

Create a Value from a list of name/value Pair s. If duplicate keys arise, earlier keys and their associated values win.

Encoding and parsing

encode :: ToJSON a => a -> ByteString Source

Efficiently serialize a JSON value as a lazy ByteString .

json :: Parser Value Source

Parse a top-level JSON value. This must be either an object or an array.