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🌟 What Are the Types of Middleware in Express.js?

Middleware in Express.js is categorized into different types based on its functionality and execution flow:

✅ 1. Built-in Middleware – Predefined middleware like express.json() for parsing JSON and express.static() for serving static files.

✅ 2. Application-Level Middleware – Custom middleware functions that run during the request-response cycle (e.g., logging, authentication).

✅ 3. Router-Level Middleware – Middleware applied to specific routes using Express Router().

✅ 4. Third-Party Middleware – Pre-built middleware like cors, helmet, and morgan for security, logging, and more.

✅ 5. Error-Handling Middleware – Special middleware with (err, req, res, next) to handle application errors.

💡 Middleware makes Express.js flexible, powerful, and easy to customize! 🎉

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