Who am I?

After login the UI just needs this. Same middleware. JSON of req.user.

src/routes/me.ts

import { Router } from "express";
import { requireAuth, type AuthedRequest } from "../middleware/auth.ts";

const router = Router();

router.get("/me", requireAuth, (req: AuthedRequest, res) => {
  res.json({ user: req.user });
});

export default router;

curl http://localhost:4000/me \
  -H "Authorization: Bearer $TOKEN"

If that returns the user, auth works. You can smile for two seconds.