Light Validation

interface SimpleUser {
  id: number;
  name: string;
  surname: string;
  lastUpdate: Date;
}

// ### mion ###
// the received user by the route is already validated and deserialized
// all Date fields are already JS Date objects (not strings from JSON.parse)
export const routes: Routes = {
  updateUser: (ctx, user: SimpleUser): SimpleUser => {
    user.lastUpdate = new Date();
    return user;
  },
};

// ### Other frameworks (Express, Fastify, Hono, etc.) ###
// Use Zod schemas for validation and date coercion
const UserSchema = z.object({
  id: z.number(),
  name: z.string(),
  surname: z.string(),
  lastUpdate: z.coerce.date(),
});

app.post("/updateUser", function (req, res) {
  const user = UserSchema.parse(req.body); // Validates + deserializes dates
  user.lastUpdate = new Date();
  res.json(user);
});