Data.Aeson import Key-CodePudding

I have the below code for parsing Int from an object. But unable to find the correct import for Key.

parseInt :: Object -> Key -> Parser Int
parseInt v field =
  asum
    [ v .: field,
      do
        s <- v .: field
        case readMaybe s :: Maybe Int of
          Nothing -> fail "not a number"
          Just x -> return x
    ]

I have tried

import Data.Aeson

and

import Data.Aeson.Types

But get the error

    Not in scope: type constructor or class ‘Key’
    A data constructor of that name is in scope; did you mean DataKinds?

What should be the correct import for Key in my function?

CodePudding user response：

It looks like you're writing code targeting aeson 2.x, but that you have aeson 1.x installed. Either upgrade (recommended), or use Text in place of Key there.