OpenAPI Specification (OAS) or Swagger offers a standardized method for documenting APIs, allowing for consistency across different tools and reducing the need for companies to create unique standards. Keeping OAS files aligned with actual API functionality is crucial to ensure user satisfaction, which can be achieved through automatic generation from code rather than manual editing. ReadMe addresses this by providing a tool called swagger-inline that uses code comments to document APIs, generating OAS files directly from these comments. This approach helps maintain up-to-date documentation by integrating swagger-inline into npm scripts for automatic file generation and validation, thus simplifying the process of hosting or sharing API documentation. While this method isn't flawless due to the potential for outdated comments, it is generally effective, and future improvements may include auto-generating full definitions by combining express routes and mongoose models.