api-documentation-generator

What this skill does

# API Documentation Generator Skill

Expert at creating comprehensive, developer-friendly API documentation.

## When to Activate

- "document API endpoints"
- "create API documentation for [feature]"
- "generate OpenAPI/Swagger spec"
- "write API integration guide"

## OpenAPI 3.0 Specification

```yaml
# openapi.yaml
openapi: 3.0.3
info:
  title: User Management API
  description: |
    Comprehensive API for managing users, authentication, and profiles.

    ## Features
    - User CRUD operations
    - JWT authentication
    - Role-based access control
    - Search and pagination

    ## Authentication
    Use Bearer token in Authorization header:
    ```
    Authorization: Bearer <your-jwt-token>
    ```
  version: 1.0.0
  contact:
    name: API Support
    email: [email protected]
    url: https://api.example.com/support
  license:
    name: MIT
    url: https://opensource.org/licenses/MIT

servers:
  - url: https://api.example.com/v1
    description: Production server
  - url: https://staging-api.example.com/v1
    description: Staging server
  - url: http://localhost:3000/v1
    description: Development server

tags:
  - name: Users
    description: User management operations
  - name: Authentication
    description: Authentication and authorization

paths:
  /users:
    get:
      tags: [Users]
      summary: List users
      description: Retrieve a paginated list of users with optional filtering
      operationId: getUsers
      security:
        - bearerAuth: []
      parameters:
        - name: page
          in: query
          description: Page number
          schema:
            type: integer
            minimum: 1
            default: 1
        - name: limit
          in: query
          description: Number of items per page
          schema:
            type: integer
            minimum: 1
            maximum: 100
            default: 10
        - name: search
          in: query
          description: Search query for name or email
          schema:
            type: string
        - name: role
          in: query
          description: Filter by user role
          schema:
            type: string
            enum: [user, admin, moderator]
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: object
                properties:
                  users:
                    type: array
                    items:
                      $ref: '#/components/schemas/User'
                  meta:
                    $ref: '#/components/schemas/PaginationMeta'
              example:
                users:
                  - id: 1
                    email: [email protected]
                    name: John Doe
                    role: user
                    createdAt: '2024-01-01T00:00:00Z'
                meta:
                  page: 1
                  limit: 10
                  total: 45
                  totalPages: 5
        '401':
          $ref: '#/components/responses/UnauthorizedError'

    post:
      tags: [Users]
      summary: Create user
      description: Create a new user account
      operationId: createUser
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateUserInput'
            example:
              name: Jane Doe
              email: [email protected]
              password: SecurePass123!
              role: user
      responses:
        '201':
          description: User created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '400':
          $ref: '#/components/responses/ValidationError'
        '409':
          description: Email already exists
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

  /users/{id}:
    get:
      tags: [Users]
      summary: Get user by ID
      operationId: getUserById
      security:
        - bearerAuth: []
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
          description: User ID
      responses:
        '200':
          description: User found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '404':
          $ref: '#/components/responses/NotFoundError'

    put:
      tags: [Users]
      summary: Update user
      operationId: updateUser
      security:
        - bearerAuth: []
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateUserInput'
      responses:
        '200':
          description: User updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'

    delete:
      tags: [Users]
      summary: Delete user
      operationId: deleteUser
      security:
        - bearerAuth: []
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
      responses:
        '204':
          description: User deleted
        '403':
          $ref: '#/components/responses/ForbiddenError'

components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

  schemas:
    User:
      type: object
      required: [id, email, name, role]
      properties:
        id:
          type: integer
          description: Unique user identifier
        email:
          type: string
          format: email
          description: User email address
        name:
          type: string
          description: User full name
        role:
          type: string
          enum: [user, admin, moderator]
          description: User role
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time

    CreateUserInput:
      type: object
      required: [email, name, password]
      properties:
        email:
          type: string
          format: email
        name:
          type: string
          minLength: 2
          maxLength: 100
        password:
          type: string
          minLength: 8
        role:
          type: string
          enum: [user, admin, moderator]
          default: user

    UpdateUserInput:
      type: object
      properties:
        email:
          type: string
          format: email
        name:
          type: string
        password:
          type: string
          minLength: 8
        role:
          type: string
          enum: [user, admin, moderator]

    PaginationMeta:
      type: object
      properties:
        page:
          type: integer
        limit:
          type: integer
        total:
          type: integer
        totalPages:
          type: integer

    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
        details:
          type: array
          items:
            type: string

  responses:
    UnauthorizedError:
      description: Authentication required
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'

    ForbiddenError:
      description: Insufficient permissions
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'

    NotFoundError:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'

    ValidationError:
      description: Validation failed
      content: