Discord.js Bot to monitor streamers

I am running this:

// The parameters of fetch

    const options = {

        method: 'GET',

        Headers: {

            'Authorization': "Bearer <OAuth>",

            'Client-ID': "<CLIENT_ID>",

            'Content-Type': 'application/json',

        },

    };

    // Sends fetch from Twitch's API

    fetch('https://api.twitch.tv/helix/streams?first=20', options)

        .then(res => console.log(res)) // expecting a json response

        .then(json =>

            fs.writeFile('data.log', JSON.stringify(json), function (err) {

                if (err) throw err;

                console.log(json);

                console.log('Updated data.log!');

            })

        )