API documentation serves as the user interface for APIs, which lack a front end, and is crucial for developers to understand and implement APIs into their code. There are two main types of API documentation: reference docs, which describe an API's schema and format, and contextual docs, which provide tutorials, authentication methods, error codes, rate limits, and pricing. The docs-as-code approach, advocated by the global technical writers' community Write the Docs, promotes treating documentation with the same tools and workflows as code, fostering collaboration between writers and developers. This method leverages the OpenAPI Specification (OAS) to define APIs in a standardized format, often using YAML or JSON, which can be transformed into interactive documentation with tools like Redocly. Redocly's tools automate the process of organizing, validating, and publishing API docs, embodying the docs-as-code philosophy to streamline documentation and enhance collaboration.