resp.json() returns a Promise and that's what you are console logging. It should resolve before getting the actual data. Since you are in an async function, you could do as below. Notice there is no need to have this then block you have.

const GetProfile = async (username) => {
  const res = await fetch(`${host}/api/v1/getprofile/${username}`);
  const data = await res.json();
  return data;
  });
};

That's normal async function behavior in javascript, they return promises.

In React, you can keep the value in a state.

const [profile,setProfile]=useState(null)

    useEffect(()=> {


        const GetProfile = async (username) => {
           const profile = await fetch(`${host}/api/v1/getprofile/${username}`).then(resp => resp.json());
           setProfile(profile)}

        GetProfile(username);

    },[username])

Because you're using .then after your async call, and resp.json() also returns a Promise which isn't being returned by your .then() call.

What happens in your case is:

const response = await fetch(`${host}/api/v1/getprofile/${username}`)
return response.json();

And because the json() function is a Promise itself (which isn't await'ed), the read of the json() call is the 'Pending' Promise that you're getting.

So to solve this, try either:

await fetch(`${host}/api/v1/getprofile/${username}`).then((resp) => resp.json())

or

const response = await fetch(`${host}/api/v1/getprofile/${username}`)

return await response.json();