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HTML / CSS / JS

// routes/api/v1/posts.js
const express = require('express');
const router  = express.Router();

// Response helpers
const ok      = (res, data, status = 200) => res.status(status).json({ data });
const fail    = (res, message, status = 400) =>
    res.status(status).json({ error: { message } });

// In-memory store (replace with DB)
let posts = [{ id: 1, title: 'Hello World', body: 'First post.' }];
let nextId = 2;

router.get('/',      (req, res) => ok(res, posts));
router.get('/:id',   (req, res) => {
    const post = posts.find(p => p.id === +req.params.id);
    if (!post) return fail(res, 'Post not found', 404);
    ok(res, post);
});
router.post('/',     (req, res) => {
    const { title, body } = req.body;
    if (!title) return fail(res, 'title is required', 422);
    const post = { id: nextId++, title, body };
    posts.push(post);
    ok(res, post, 201);
});
router.patch('/:id', (req, res) => {
    const post = posts.find(p => p.id === +req.params.id);
    if (!post) return fail(res, 'Post not found', 404);
    Object.assign(post, req.body);
    ok(res, post);
});
router.delete('/:id', (req, res) => {
    posts = posts.filter(p => p.id !== +req.params.id);
    res.status(204).end();
});

module.exports = router;