Decodes JSON into a custom Elm type and provides helpers for generating encoders and decoders for that with elm-codegen.

This package was designed and built to help with taking JSON of an unknown shape and generating code for encoding / decoding it with elm-codegen. I'm not sure if there are many good uses for this package beyond that use-case!

To get started, run the decode function with some JSON. This can be JSON encoded in your Elm app or JSON from an external source, like flags or ports.

decodeToElm : Json.Decode.Value -> Result Json.Decode.Error JsonToElm.Value
decodeToElm json =
    Json.Decode.decodeValue JsonToElm.decode json

If the JSON passed to the function above had this shape:

{
    "name": "Joshua",
    "friends": ["John", "Cindy", "Leslie"],
    "active": "true"
}

It would result in the following JsonToElm.Value being returned:

JsonToElm.Record
    (Dict.fromList 
        [ ( "name", JsonToElm.StringVal "Joshua" )
        , ( "friends"
          , JsonToElm.ListVal 
            [ JsonToElm.StringVal "John"
            , JsonToElm.StringVal "Cindy"
            , JsonToElm.StringVal "Leslie"
            ] 
          )
        , ( "active", JsonToElm.BoolVal True )
        ]
    )