slate/pages/api/hydrate.js

import * as ViewerManager from "~/node_common/managers/viewer";
import * as Utilities from "~/node_common/utilities";

export default async (req, res) => {
  const id = Utilities.getIdFromCookie(req);

  if (!id) {
    return res.status(401).send({ decorator: "SERVER_NOT_AUTHENTICATED", error: true });
  }

  const data = await ViewerManager.getById({ id });

  if (!data) {
    return res.status(500).send({ decorator: "SERVER_VIEWER_DATA_ERROR", error: true, data: null });
  }

  return res.status(200).send({ decorator: "SERVER_HYDRATE", success: true, data });
};