How to Use TypeSpec for Documenting and Modeling APIs

TypeSpec is an open-source declarative language developed by Microsoft designed to describe and model APIs. It offers a modern syntax close to TypeScript, enabling the automatic generation of OpenAPI, JSON Schema, or Protobuf specifications, along with server and client code. TypeSpec emphasizes clarity, reusability, productivity, consistency, and scalability in API design and integrates with tooling like Visual Studio Code. Unlike traditional tools like Swagger, TypeSpec writes API designs in a domain-specific language first, then generates all necessary artifacts, maintaining high standards for large-scale API design. The guide also compares TypeSpec with other API documentation tools, highlights best practices for structuring TypeSpec projects, and offers complete examples of using TypeSpec to create and manage APIs.