useEffect with async and Cookies.get in NextJS

I'm trying to get cookie data in use effect and then use that data, my component looks like this..

const Favourites = (props) => {
  const [isClick, setClick] = useState(false);

  const activityId = props.activityId

  useEffect(() => {
    const favourites = Cookies.get('favourites')
    if (favourites[activityId] === true) {
      setClick(true)
    }
  })

  return (
    <>
      <div className="heart">
        <Heart isClick={isClick} onClick={() => setClick(!isClick)} />
      </div>

    </>
  );
}

this is what I get when I console.log(Cookies.get('favourites')) -

{"5edf47240dcb4713d3942e1b":true,"5edf47240dcb4713d3942e2b":true,"5fa10bd8f70458050ffe68af":true}

changing

const favourites = Cookies.get('favourites')

to

const favourites = {"5edf47240dcb4713d3942e1b":true,"5edf47240dcb4713d3942e2b":true,"5fa10bd8f70458050ffe68af":true}

produces the desired effect.

favourites is an array of activityID's stored in localstorage using js-cookie. it's basically a list of the users favourite activities, if they like the activity and click the heart button then the activityID is stored as the key and the value is set to true

the above doesn't work, setClick isn't being set to true if the activityId is true in the favourites array. If I console.log(Cookies.get('favourites')) and copy the result into const favourites then it does work

From your edit, it looks like what console.log is showing is actually a string. So, doing a JSON.decode on what Cookies.get is returning should do the trick:

const favourites = JSON.decode(Cookies.get('favourites'));