Data.Aeson.QQ

This package expose the function aesonQQ that compile time converts json code into a Value. aesonQQ got the signature

 aesonQQ :: QuasiQuoter

and is used like

 myCode = [aesonQQ| {age: 23, name: "John", likes: ["linux", "Haskell"]} |]

where it is important that

• you got no space in [aesonQQ| and
• no additional code after |].

The quasiquatation can also bind to variables like

 myCode = [aesonQQ| {age: <|age|>, name: <|name|>} |]
 where age = 23 :: Integer
       name = "John"

where the function toJSON will be called on age and name at runtime.

You can also insert Haskell code:

 myCode = [aesonQQ| {age: <|succ age|>, name: <|map toUpper name|>} |]
 where age = 23 :: Integer
       name = "John"

If you want to replace the name of the key in a hash you'll use the $-syntax:

 foo = [aesonQQ| {$bar: 42} |]
 bar = "age"

Documentation

aesonQQ :: QuasiQuoter