Use this 28-page MS Word template to document your REST/Web APIs. This template pack includes detailed examples, guidelines, and screenshots.
You also get a 16 page How to Write API Document tutorial that explains how to write each section in your API reference documentation. It includes helpful explanatory text that walks you through the process of documenting each section in the API, including the parameters, endpoints, requests, responses, and endpoints.
You can change everything in the document – text, images, and tables. There are no special plug-ins, macros, or installation files.