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title: Document your APIs with Fern
updated: 2026-03-01T00:00:00.000Z
max-toc-depth: 2
topictype: concept
ux: v12
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Fern is a docs-as-code platform that generates a comprehensive documentation site from your Postman Collection. When you publish, Fern automatically creates your API reference. From there, you can add guides, tutorials, and other content to build a complete documentation site.

![Example Fern Docs site: Cohere](https://assets.postman.com/postman-docs/v12/fern/cohere-docs-site.png)

## How Fern works

When you publish a Postman Collection with Fern, your documentation is deployed to a live site backed by a GitHub repository that your team owns. You get full edit rights and ownership, with the flexibility to customize your site after publishing.

Fern documentation includes:

* **API reference** — Automatically generated from your collection with request details, sample code, and an interactive API explorer where users can make real API calls.
* **Guides and tutorials** — Add overview pages, get started guides, and other content alongside your API reference.
* **AI-powered features** — Intelligent search with Ask Fern, plus Fern Writer to help draft and update content
* **Custom branding** — Configure your site name, colors, logo, custom domain, and more.

## Get started with Fern

To publish your collection documentation with Fern, see [Document a collection with Fern](/docs/collaborating-in-postman/publishing-your-api/fern/document-a-collection).

After publishing, you can manage your documentation through the [Fern Dashboard](https://buildwithfern.com/learn/dashboard/getting-started/overview). From your collection in Postman, you can also edit published documentation or unpublish your site.