Structured Express API

import { Router } from "express";
import { z } from "zod";
import { HttpError } from "../middleware.js";
import { deleteNote, getNote, listNotes, saveNote } from "../store.js";

export const notesRouter = Router();

const NoteInput = z.object({
  title: z.string().trim().min(1).max(120),
  body: z.string().max(10_000).default(""),
  tags: z.array(z.string().trim().min(1).max(30)).max(10).default([]),
});

const Query = z.object({ q: z.string().optional(), tag: z.string().optional() });

notesRouter.get("/", (req, res) => {
  const parsed = Query.safeParse(req.query);
  if (!parsed.success) throw new HttpError(400, "Invalid query");
  res.json({ notes: listNotes(parsed.data) });
});

notesRouter.get("/:id", (req, res) => {
  const note = getNote(req.params.id);
  if (!note) throw new HttpError(404, "Note not found");
  res.json({ note });
});

notesRouter.post("/", (req, res) => {
  const parsed = NoteInput.safeParse(req.body);
  if (!parsed.success) return res.status(400).json({ error: "Validation failed", details: parsed.error.flatten() });
  res.status(201).json({ note: saveNote(parsed.data) });
});

notesRouter.put("/:id", (req, res) => {
  if (!getNote(req.params.id)) throw new HttpError(404, "Note not found");
  const parsed = NoteInput.safeParse(req.body);
  if (!parsed.success) return res.status(400).json({ error: "Validation failed", details: parsed.error.flatten() });
  res.json({ note: saveNote(parsed.data, req.params.id) });
});

notesRouter.delete("/:id", (req, res) => {
  if (!deleteNote(req.params.id)) throw new HttpError(404, "Note not found");
  res.status(204).end();
});