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Can you help me build a REST API with Express.js? I need endpoints for user authentication including JWT tokens, and CRUD operations for a blog post system.

I'd be happy to help you build a REST API with Express.js! Let me break this down into a well-structured project. Here's the authentication setup with JWT:

server.js
const express = require('express'); const jwt = require('jsonwebtoken'); const bcrypt = require('bcryptjs'); const app = express(); app.use(express.json()); // Auth middleware const authMiddleware = (req, res, next) => { const token = req.header('Authorization'); if (!token) return res.status(401).json({ error: 'Access denied' }); try { const verified = jwt.verify( token, process.env.JWT_SECRET ); req.user = verified; next(); } catch(err) { res.status(400).json({ error: 'Invalid token' }); } };

Now let's add the blog post CRUD routes with proper validation:

routes/posts.js
const router = express.Router(); // GET all posts router.get('/api/posts', async (req, res) => { const posts = await Post.find() .populate('author', 'name email') .sort({ createdAt: -1 }); res.json(posts); }); // POST create new post router.post('/api/posts', authMiddleware, async (req, res) => { const post = new Post({ title: req.body.title, content: req.body.content, author: req.user._id }); await post.save(); res.status(201).json(post); });

This setup gives you a solid foundation with:

• JWT Authentication — secure token-based auth with middleware
• Password Hashing — bcrypt for secure password storage
• RESTful Routes — clean CRUD operations for blog posts
• Input Validation — protects against malformed requests

Want me to add rate limiting, pagination, or error handling middleware next?

Yes, add rate limiting and error handling middleware. Also, can you show the pagination helper?

Great choices! Let me add all three. First, here's the rate limiting setup using express-rate-limit:

middleware/rateLimiter.js
const rateLimit = require('express-rate-limit'); const apiLimiter = rateLimit({ windowMs: 15 * 60 * 1000, // 15 min max: 100, message: { error: 'Too many requests', retryAfter: '15 minutes' } }); module.exports = { apiLimiter };

And the pagination helper with cursor-based support:

utils/pagination.js
const paginate = async (model, query, opts) => { const page = parseInt(opts.page) || 1; const limit = parseInt(opts.limit) || 20; const skip = (page - 1) * limit; const [data, total] = await Promise.all([ model.find(query).skip(skip).limit(limit), model.countDocuments(query) ]); return { data, pagination: { page, limit, total, pages: Math.ceil(total / limit), hasNext: page * limit < total, hasPrev: page > 1 } }; };
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