JavaScript to Haskell

07: JSON Payloads

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Returning actual Data in Json

  • Building out some hardcoded users

  • need to supply User before the data

  • don’t forget the = sign

  • We could manually build the encode and decode to/from JSON, but Generics, lets you automatically do things based on the data type

    • adding {-# LANGUAGE DeriveGeneric #-} and import GHC.Generics

    • don’t forget to add instance

    • instance ToJSON User
      • instance FromJSON User

      Now we are able to see the output of having the generic encoder

      Ok, two modules loaded.
      *Main Lib> import Data.Aeson (encode)
      *Main Lib Data.Aeson> encode bob
      "{\"userName\":\"Bobby Boy\",\"userId\":1}"
      • And now with that it looks like Scotty has a function json for use to return a json payload. sweet
        • get "/users" $ do
        json allUsers
        Resources
        • Following this guide a bit
        • Aeson
        • Scotty
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                JavaScript to HaskellBy Jesse Tomchak