backend/src/middleware/parseId.js

import { BadRequestError } from "../shared/errors/index.js";

export function parseId(req, res, next) {
  const id = Number(req.params.id);
  if (!Number.isInteger(id) || id <= 0) {
    return next(new BadRequestError("invalid_id"));
  }
  req.params.id = id;
  next();
}