> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://cla-demo.postmansolutions.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://cla-demo.postmansolutions.com/_mcp/server.

# Introduction

**Zod** is a TypeScript-first validation library that provides runtime validation.

* Runtime validation of API request and response payloads.
* Generating TypeScript types directly from validation schemas.
* Custom error messages and complex validation logic.
* Not natively compatible with OpenAPI/Swagger generation

**JSON Schema** is used to define the structure, types, and constraints of JSON data.

* Validating request and response payloads in APIs.
* Generating OpenAPI/Swagger documentation.
* Limited control over custom error messages