Fetch data from Strava API and return data to table

I’ve tried quite a few things and read a lot of examples of using the data returned by Fetch as an object to put into a table or similar but I can’t seem to get it. The following code authorises the Strava user to use my test App and then gets the Users last 30 activities. Once data is returned as a Promise I can view it in the console, but not use it. I’m a bit of a novice so just need some direction on how to use this data in table.

//my code is below

<script>

    //reAuthorize Click
    function Authorize() {
            document.location.href = "https://www.strava.com/oauth/authorize?client_id=73630&redirect_uri=https://localhost:44370/strava/index&response_type=code&scope=activity:read_all"
    }

    const codeExchangeLink = `https://www.strava.com/api/v3/oauth/token`
    function codeExchange() {


        fetch(codeExchangeLink, {
            method: 'post',
            headers: {
                'Accept': 'application/json, text/plain, */*',
                'Content-Type': 'application/json'
            },

            body: JSON.stringify({
                client_id: '@ViewBag.cId',
                client_secret: '@ViewBag.cSec',
                code: '@ViewBag.code',
                //need to do this to get a new refresh token that 'reads all' and issues a new Access Token - refer to comments below
                grant_type: 'authorization_code'
            })
        })
            .then(res => res.json())
            .then(res => getActivities(res))
 
    }

    //  getActivities
    const auth_link = "https://www.strava.com/oauth/token"

    function getActivities(res) {

        var obj;
        const activities_link = `https://www.strava.com/api/v3/athlete/activities?access_token=${res.access_token}`
        fetch(activities_link)
            .then((res) => console.log(res.json()))

    }

</script>


<form asp-action="Index" method="get">
    <input type="text" id="cId" value="@ViewBag.cId" />
    <input type="text" id="cSec" value="@ViewBag.cSec" />
    <input type="text" id="rT" value="@ViewBag.rT" />
    <input type="text" id="code" value="@ViewBag.code" />
    <input type="text" id="test" />
</form>
<input type="button" onclick="Authorize()" value="ReAuthorise" />
<input type="button" onclick="codeExchange()" value="Get Activities" />