---
title: "Chapter 4: OpenAPI spec and generated reference docs"
date: 2026-10-03
description: "Download PDF The OpenAPI specification provides a standard way to describe REST APIs, and includes elements such as paths, operations, parameters, and schemas. Tools like Stoplight,..."
canonical_url: https://idratherbewriting.com/learnapidoc/restapispecifications
---

> For AI agents: a documentation index is available at https://idratherbewriting.com/llms.txt. Markdown versions of all pages are available by appending .md to any page URL.

# Chapter 4: OpenAPI spec and generated reference docs

[Download PDF](https://www.buymeacoffee.com/learnapidoc/e/146076)

The OpenAPI specification provides a standard way to describe REST APIs, and includes elements such as paths, operations, parameters, and schemas. Tools like Stoplight, Swagger UI, SwaggerHub, and Redocly can generate interactive API reference documentation from the OpenAPI spec. In this chapter, you follow a tutorial for using Stoplight, a visual editor, to create an OpenAPI specification file and publish the documentation. As you work with the OpenAPI spec, you learn about “spec-first development,” a philosophy of creating the spec before developers write API code, as well as other challenges, such as integrating the reference output and conceptual documentation in a seamless experience.

- [Overview of REST API specification formats](https://idratherbewriting.com/learnapidoc/pubapis_rest_specification_formats.html)
- [Introduction to the OpenAPI specification](https://idratherbewriting.com/learnapidoc/pubapis_openapi_intro.html)
- [Stoplight: Visual modeling tools for creating your spec](https://idratherbewriting.com/learnapidoc/pubapis_stoplight.html)
- [Getting started tutorial: Using Stoplight to create an OpenAPI specification document](https://idratherbewriting.com/learnapidoc/pubapis_openapis_quickstart_stoplight.html)
- [Swagger UI tutorial](https://idratherbewriting.com/learnapidoc/pubapis_swagger.html)
- [SwaggerHub introduction and tutorial](https://idratherbewriting.com/learnapidoc/pubapis_swaggerhub_smartbear.html)
- [Swagger UI Demo](https://idratherbewriting.com/learnapidoc/pubapis_swagger_demo.html)
- [Integrating Swagger UI with the rest of your docs](https://idratherbewriting.com/learnapidoc/pubapis_combine_swagger_and_guide.html)
- [Redocly tutorial -- authoring and publishing API docs with Redocly's command-line tools](https://idratherbewriting.com/learnapidoc/pubapis_redocly.html)
- [Redoc Community Edition Basic Demo](https://idratherbewriting.com/learnapidoc/pubapis_redoc.html)
- [Document360 for API docs](https://idratherbewriting.com/learnapidoc/pubapis_document360.html)