Introduction

Create comprehensive API documentation that developers actually want to read. Document REST APIs, GraphQL schemas, authentication flows, and endpoint specifications using Markdown, Mermaid diagrams, and AI assistance.

Modern API documentation needs to be more than just a list of endpoints. It should include interactive examples, visual flows, and clear explanations that help developers integrate quickly and correctly.

Why AutEng for API Documentation?

REST API Endpoints

Document your REST API with clear endpoint specifications including HTTP methods, URLs, parameters, and response formats.

GET /api/users/123
Authorization: Bearer <token>

{
  "user_id": "123",
  "name": "John Doe",
  "email": "john@example.com",
  "created_at": "2025-01-01T00:00:00Z"
}

GraphQL Schemas

Document GraphQL APIs with schema definitions, queries, mutations, and field-level documentation.

type User {
  id: ID!
  name: String!
  email: String!
  posts: [Post!]!
}

query GetUser($id: ID!) {
  user(id: $id) {
    id
    name
    email
    posts {
      title
      content
    }
  }
}

{
  "id": "123"
}

Authentication Flows

Visualize authentication and authorization processes with sequence diagrams. Show OAuth flows, JWT token handling, and API key management.

Rendering diagram...

Error Handling

Document error responses, status codes, and troubleshooting guides to help developers handle edge cases.

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "The request is missing required parameters",
    "details": {
      "missing_fields": ["email", "password"]
    }
  }
}

Best Practices

• Start with the basics: Document endpoints, methods, and parameters before adding advanced features
• Include real examples: Show actual request/response payloads that developers can copy
• Use sequence diagrams: Visualize complex flows like authentication and multi-step processes
• Document error cases: Show what happens when things go wrong and how to handle it
• Keep it updated: Use version history to track changes as your API evolves