A GraphQL response does not require the data field

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elm-graphql/src/GraphQl/Http.elm

Line 41 in 240f239

, expect = Http.expectJson msg (Decode.field "data" decoder)

This is an incorrect assumption. You can get a valid response with just an errors field.

According to https://spec.graphql.org/draft/#sec-Response-Format GraphQL requests should produce something like this:

type alias GQLError = 
  { message : String
  , path : List String
  , locations : …
  , extensions : …
  }
 
  
type alias GQLResponse = 
  { errors: Maybe (List GQLError)
  , data: Maybe Value
  , extensions: Maybe Value
  }