Get Checkout API Fails

[dev-t]

Hi,

I am trying to fetch the checkout details for a checkoutId using the nodeJS libraries. I have tried using both Shopify-api and shopify-buy sdk. In both of them, I am not able to get the response. 

Here is the test code snippet: 

const fetch = require('node-fetch');
const ShopifyBuy = require('shopify-buy');
const ShopifyApi = require('@shopify/shopify-api');
const shop = 'xxxxxxxxxxxxxxxx';
const storefrontAccessToken = 'xxxxxxxxxxxxxxxxxxxxxx';


const shopifyBuyClient = new ShopifyBuy({
    domain: shop,
    storefrontAccessToken
});
/*
 * Saw this on the Github page: 
 * https://github.com/Shopify/storefront-api-examples/blob/master/node-js-buy/src/js-buy-sdk.js
 */
global.fetch = fetch;

const apiClient = new ShopifyApi.Shopify.Clients.Storefront(shop, storefrontAccessToken);

const checkoutId =
    'Z2lkOi8vc2hvcGlmeS9DaGVja291dC8xNjhkYzVkMTA0M2U0NDVhNDA2ZDkyNDVhOTZhODI4ND9rZXk9N2NhMTNiMDE5YWQxMWYxYTAxOWFiZGQ4MmJlZmUyNmY=';

const query = `
  node(id: "Z2lkOi8vc2hvcGlmeS9DaGVja291dC8xNjhkYzVkMTA0M2U0NDVhNDA2ZDkyNDVhOTZhODI4ND9rZXk9N2NhMTNiMDE5YWQxMWYxYTAxOWFiZGQ4MmJlZmUyNmY=") {
    id
      ... on Checkout {
        id
        webUrl
      }
    }
}`;

apiClient
    .query({ data: query })
    .then(res => {
        console.log(res);
    })
    .catch(err => console.error(err));

shopifyBuyClient.checkout
    .fetch(checkoutId)
    .then(checkout => {
        console.log(checkout);
    })
    .catch(error => {
        console.log(error);
    });

Fetching from shopify-buy sdk produces the error: [ { message: 'an unknown error has occurred.' } ]

Shopify-api produces the following error: 

HttpRequestError: Failed to make Shopify HTTP request: FetchError: invalid json response body at https://medly-pharmacy.myshopify.com/api/unstable/graphql.json reason: Unexpected end of JSON input

at HttpRequestError.ShopifyError [as constructor] (/Users/devT/shopifyTest/node_modules/@shopify/shopify-api/dist/error.js:13:28)

at new HttpRequestError (/Users/devT/shopifyTest/node_modules/@shopify/shopify-api/dist/error.js:79:42)

at /Users/devT/shopifyTest/node_modules/@shopify/shopify-api/dist/clients/http_client/http_client.js:243:35

at processTicksAndRejections (internal/process/task_queues.js:95:5)

On another note, how can I fetch a checkout for a customer?