futurizeP get payload with json()

futurizeP.js

const Task = require('data.task');
const fetch = require('node-fetch');

//    futurizeP :: (* -> Promise a b) -> * -> Task a b
const futurizeP = require('futurize').futurizeP(Task);

//    fetchJson_ :: Url -> Promise Error Object
const fetchJson_ = url => fetch(url).then(res => res.json());

//    fetchJson :: Url -> Task Error Object
const fetchJson = futurizeP(fetchJson_);

//    getUser :: Url -> UserId -> Task Error Object
const getUser = apiUrl => Id => fetchJson(`${apiUrl}/${Id}`);