This package exposes the function
aesonQQ
that compile-time converts a string representation of a JSON value into a
Data.Aeson.Value.
aesonQQ has the signature
aesonQQ :: QuasiQuoterand is used like
{-# LANGUAGE QuasiQuotes #-}
import Data.Aeson.QQ
import Data.Aeson (Value)
john :: Value
john = [aesonQQ| {age: 23, name: "John", likes: ["linux", "Haskell"]} |]The quasiquoter can also interpolate variables like
jane :: Value
jane = [aesonQQ| {age: #{age}, name: #{name}} |]
where
age = 23 :: Int
name = "Jane"where the function
toJSON.
will be called on age and name at runtime.
You can also interpolate arbitrary Haskell expressions:
mary :: Value
mary = [aesonQQ| {age: #{succ age}, name: "Mary"} |]
where
age = 23 :: IntIf you want to replace the name of the key in a hash you'll use the $-syntax:
joe :: Value
joe = [aesonQQ| {$key: 23, name: "Joe"} |]
where
key = "age"
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