aeson

I want to create a high-performance HTTP-based API running on Haskell using warp as a HTTP backend. The server shall return JSON data upon request. This data shall be serialized by using Aeson However, warp requires a response object whereas Aeson returns lazy ByteString s. How can I tie both libraries together? For this question's scope I'm not interested in query parsing or routing, but in an example of how to tie both libraries together to deliver a correct JSON with correct headers. Note : This question intentionally does not show any research effort, as it was answered Q&A-style-ish. See

Can't find a good example. Appreciate any help. The JSON is as follows: [{ "EXIF:Make": "Canon", "EXIF:Model": "Canon PowerShot S95", "EXIF:Orientation": "Horizontal (normal)", "EXIF:XResolution": 180, "EXIF:YResolution": 180, "EXIF:ResolutionUnit": "inches" }] The code I used is as follows: import Data.Aeson import Data.Attoparsec import Data.ByteString x <- fmap (parse json) (Data.ByteString.readFile "json.txt") How do I define & use the FromJSON type to convert from x into: data Exif = Exif [[(String, String)]] or similar data structure? Note the [[]] -- I'm expecting the JSON to have

I'm using an external API which returns JSON responses. One of the responses is an array of objects and these objects are identified by the field value inside them. I'm having some trouble understanding how the parsing of such JSON response could be done with Aeson. Here is a simplified version of my problem: newtype Content = Content { content :: [Media] } deriving (Generic) instance FromJSON Content data Media = Video { objectClass :: Text , title :: Text } | AudioBook { objectClass :: Text , title :: Text } In API documentation it is said that the object can be identified by the field