Defending Your Domain: Schema Validation and Global Error Handling In my previous post , I shared how Clean Architecture allowed me to swap my database layer in minutes. But architecture isn't just about being able to change parts; it's about protecting your system from the outside world. Today, I added a "bouncer" to my API: Schema Validation . The Problem: Silent Failures Without validation, your Use Case might receive an empty name, a fake email, or a message that is too short. This leads to corrupted data in your database and unexpected "Internal Server Errors" (500) that give no clue to the user about what went wrong. The Solution: Zod + Global Error Handler I chose Zod for schema validation because it's type-safe, extremely popular in the modern Node.js ecosystem, and integrates perfectly with JavaScript. 1. Defining the Contract Instead of just accepting any object, I defined exactly what a Feedback should look like.…