borders/pages/api/user/border/[id].js

import NextCors from "nextjs-cors";
import { getByDiscordId } from "../../../../lib/borders";

export default async function handler(req, res) {
  const id = req.query.id;

  await NextCors(req, res, {
    methods: ["GET", "HEAD"],
    origin: "*",
    optionsSuccessStatus: 200,
  });

  const result = await getByDiscordId(id);
  const borderUrl = result ?? "0";

  return res.status(200).send(borderUrl);
}