GitHub Publishes an OpenAPI Description of Its REST API

GitHub's REST API has evolved through three major revisions since its debut shortly after the site's 2008 launch. Many developers have cited it as a design influence, and the API is often treated as a reference standard across the industry. Now the company is making it easier to work with by releasing an open-source OpenAPI description of the entire REST API.

What the OpenAPI Description Provides

OpenAPI is a language-agnostic, widely adopted specification for describing HTTP APIs. It lets both humans and machines discover the interface and capabilities of an API without reading documentation first or digging into its implementation.

The GitHub description covers more than 600 operations exposed through the API. Practical uses include:

  • Visual exploration by loading the description as a Postman Collection
  • Generating mock servers and test suites programmatically
  • Creating client bindings for languages not supported by Octokit

The description is distributed in two formats. The bundled version relies on OpenAPI components for reuse and readability, and is recommended for most use cases. A fully dereferenced version is also provided for tooling that does not handle inline component references cleanly.

Current Status and Release Cadence

The project is still in beta, which the GitHub team attributes to the difficulty of describing a 12-year-old API. The description was assembled from existing JSON schemas, documented examples, contract testing, and manual effort. Updates are expected to improve both completeness and accuracy as OpenAPI becomes more central to the developer experience, both inside and outside GitHub.

The release cadence differs by platform. GitHub Enterprise Server and GitHub Private Instances receive quarterly releases, tracked with version labels such as v2.21. GitHub.com itself gets more frequent updates to the description.

Contributing

The project is open to external help. Developers interested in improving the description's completeness and accuracy or its consumption ergonomics can consult the contributing guide. Issues should be reported on the repository's issue tracker.

The work stems from earlier efforts to describe the API by Gregor Martynus, the Docs Engineering team's extensive OpenAPI work for documentation, and validation provided by Will Roden through the octo-go project, with contributions from Redoc.ly along the way.