Middleware Deep Dive

Introduction

Middleware is where requests are shaped, checked, and passed along. This lesson shows how to build powerful middleware pipelines in Cortado.js for clean, modular processing.

You’ll learn

• Writing global and route-specific middleware

• Handling authentication, logging, and input validation

• Controlling flow with next() and error throwing

• Structuring shared middleware across routes

Why it matters

Middleware makes APIs scalable and secure. This lesson will help you avoid repetition and handle common logic (auth, logging, etc.) in a clean, reusable way.