Request Body Validation in TypeScript with Zod

Modern web applications must validate incoming client data to prevent security vulnerabilities and runtime crashes. This text-based course guides you through securing your endpoints using TypeScript and the Zod schema validation library. You will learn how to write clean, reusable code that automatically enforces type-safe payloads at the API boundary. By the end of this course, you will be able to construct robust validation schemas, integrate them seamlessly into Express middleware, and eliminate redundant boilerplate code. What you will learn: Understand the core concepts of schema-based validation and type safety; Create schema definitions using Zod to match your application data models; Build a reusable Express middleware to validate incoming request bodies; Implement modern TypeScript type inference to keep your schemas and types in sync; Handle validation errors gracefully and return structured JSON responses to the client; Write clean, testable validation logic that scales with your codebase. The course begins with foundational concepts of API security and data modeling before moving into schema creation and middleware implementation. This course is designed for beginner to intermediate TypeScript developers looking to improve their API architecture. No prior validation library experience is required, but a basic understanding of Express and TypeScript is recommended. Start writing safer, cleaner fullstack TypeScript APIs today.