In software engineering, documentation is often overlooked but plays a crucial role in helping users understand and utilize an API effectively. Good API documentation helps users maximize the value of the software, prevents misuse, and contributes to establishing a strong user base. However, keeping documentation up-to-date can be challenging. To simplify this process, various API documentation tools are available, such as SwaggerUI, ReDoc, ReadMe, apiDoc, Postman, and Bump.sh. These tools offer features like automatic generation of documentation based on an OpenAPI Specification (OAS), customization options, community support, and pricing plans to suit different needs.