API Docs Writer

API Docs Writer

Generate complete API documentation by analyzing route handler source code.

Workflow

1. Find all API routes Search for API route files:

   • Next.js: app/api/**/route.ts
   • Express: files with router.get/post/put/delete
   • FastAPI: files with @app.get/post/put/delete

2. Analyze each route For every endpoint, extract:

   • HTTP method (GET, POST, PUT, DELETE)
   • URL path and path parameters
   • Query parameters
   • Request body schema (from TypeScript types or validation)
   • Response schema (from return statements)
   • Authentication requirements
   • Error responses

3. Generate documentation using this format for each endpoint:

### [METHOD] /api/path

[One-line description]

**Authentication:** Required / None

**Request**

| Parameter | Type   | In    | Required | Description |
|-----------|--------|-------|----------|-------------|
| id        | string | path  | yes      | Resource ID |

**Request Body**
\`\`\`json
{
  "field": "value"
}
\`\`\`

**Response (200)**
\`\`\`json
{
  "data": { ... }
}
\`\`\`

**Error Responses**
| Status | Description |
|--------|-------------|
| 401    | Unauthorized |
| 404    | Not found   |

4. Write the output Create or update the docs file (e.g., docs/API.md or API_REFERENCE.md).

Rules

• Include curl examples for each endpoint
• Show both success and error response examples
• Group endpoints by resource/domain
• Note any rate limits or special headers required
• Include authentication details (Bearer token, API key, cookies)
• Link to related endpoints where relevant