I am getting an error from generate token in google oauth API.

error:https://www.googleapis.com/oauth2/v3/token' from origin 'null' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

  fetch("https://www.googleapis.com/oauth2/v3/token", {
      method: "POST",
      headers: new Headers({
        "Access-Control-Allow-Origin": window.location.origin,
        "Access-Control-Allow-Methods": "DELETE, GET, POST, PUT",
        "Access-Control-Allow-Header": "X-Requested-With,content-type",
        "Access-Control-Allow-Credentials": true,
      }),
      body: JSON.stringify({
        redirect_uri: redirect_uri,
        client_secret: client_secret,
        client_id: client_id,
        refresh_token: refresh_token,
        scope: scope,
        grant_type: "refresh_token",
      }),
    })
      .then((res) => res.json())
      .then((res) => {
        console.log(res);
        localStorage.setItem("accessToken", res.access_token);
        localStorage.setItem("refreshToken", res.refreshToken);
        localStorage.setItem("expires_in", res.expires_in);
      });