OpenAPI

Manual Setup

Install the required packages.

npm install fumadocs-openapi shiki

Generate Styles

Please note that you must have Tailwind CSS v4 configured.

Tailwind CSS

@import 'tailwindcss';
@import 'fumadocs-ui/css/neutral.css';
@import 'fumadocs-ui/css/preset.css';
@import 'fumadocs-openapi/css/preset.css';

Configure Pages

Create an OpenAPI instance on the server. Fumadocs OpenAPI renders the pages on server-side.

lib/source.ts

import { createOpenAPI, attachFile } from 'fumadocs-openapi/server';
import { loader } from 'fumadocs-core/source';
 
export const source = loader({
  pageTree: {
    // adds a badge to each page item in page tree
    attachFile,
  },
});
 
export const openapi = createOpenAPI({
  // options
});

Add APIPage to your MDX Components, so that you can use it in MDX files.

mdx-components.tsx

import defaultComponents from 'fumadocs-ui/mdx';
import { APIPage } from 'fumadocs-openapi/ui';
import { openapi } from '@/lib/source';
import type { MDXComponents } from 'mdx/types';
 
export function getMDXComponents(components?: MDXComponents): MDXComponents {
  return {
    ...defaultComponents,
    APIPage: (props) => <APIPage {...openapi.getAPIPageProps(props)} />,
    ...components,
  };
}

It is a React Server Component.

Generate Files

You can generate MDX files directly from your OpenAPI schema.

Create a script:

scripts/generate-docs.mjs

import { generateFiles } from 'fumadocs-openapi';
 
void generateFiles({
  input: ['./unkey.json'], // the OpenAPI schemas
  output: './content/docs',
  // we recommend to enable it
  // make sure your endpoint description doesn't break MDX syntax.
  includeDescription: true,
});

Only OpenAPI 3.0 and 3.1 are supported.

Generate docs with the script:

node ./scripts/generate-docs.mjs

Features

The official OpenAPI integration supports:

Basic API endpoint information
Interactive API playground
Example code to send request (in different programming languages)
Response samples and TypeScript definitions
Request parameters and body generated from schemas

Demo

View demo.