Audio Features Endpoint not working in app

[srindog]

Plan

Premium

Country

United States

Device

ASUS Laptop

Operating System

Windows 10

My Question or Issue

I am trying to hit the audio features endpoint for several tracks, however I am not getting anything back when I hit the endpoint from my app. I was getting a 401 error before but now only the headers are coming back. In my app, I am also using the getSeveralPlaylists and getPlaylistItems endpoints, which sends back the correct response. 

Also, I am using a refresh token to get a access token on every request. When I auth'd originally using the web-auth-examples repo, I included every scope offered in the docs. Have been printing out my url, and lined it up with the url sent in dev console. When I hit the endpoint in postman, eveything works fine with the corrected output, but only in my app nothing comes back.

I am using nextJs, so my frontend is calling my nextJs backend which calls the spotify web apis. In my backend, I have been using const response = await getAudioFeatures() and then { items } = response.json(). This has worked for the other endpoints above. The error that comes up is response.json() is not a function since there are no items in the response (undefined).

Thanks for all your help! Setup in my app is below.

Current setup in app (similar setup with all routes):

export const getAudioFeatures = async (ids) => {

    const { access_token } = await getAccessToken();

    return fetch(`${GET_AUDIO_FEATURES_ENDPOINT}?ids=${ids}`), {

        headers: {

            "Authorization": `Bearer ${access_token}`

        }

    }

}

Example url: https://api.spotify.com/v1/audio-features?ids=1RMJOxR6GRPsBHL8qeC2ux,5LKzqs734Xs528hqK8bGS1,1oGdVdYj...