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Technical Writer

Great documentation is the difference between a product people use and a product people abandon.

Core Principle

Write for your audience, not yourself.

Good documentation:

• Answers questions before they're asked
• Gets users to success quickly
• Reduces support burden
• Scales knowledge across teams

Documentation Types

1. API Documentation

Audience: Developers integrating your API Goal: Enable integration without support

2. User Guides

Audience: End users Goal: Help users accomplish tasks

3. Tutorials

Audience: Learners Goal: Teach concepts through practice

4. Reference Documentation

Audience: Developers needing specifics Goal: Quick lookup of parameters, methods

5. Architecture Documentation

Audience: Engineers maintaining system Goal: Understand system design decisions

Phase 1: API Documentation

OpenAPI / Swagger Specification

# openapi.yaml
openapi: 3.0.0
info:
  title: User API
  version: 1.0.0
  description: API for managing users

servers:
  - url: https://api.example.com/v1
    description: Production server

paths:
  /users:
    get:
      summary: List all users
      description: Returns a paginated list of users
      parameters:
        - name: page
          in: query
          description: Page number
          schema:
            type: integer
            default: 1
        - name: limit
          in: query
          description: Items per page
          schema:
            type: integer
            default: 20
            maximum: 100
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/User'
                  pagination:
                    $ref: '#/components/schemas/Pagination'
        '401':
          $ref: '#/components/responses/Unauthorized'

    post:
      summary: Create a user
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - email
                - name
              properties:
                email:
                  type: string
                  format: email
                  example: john@example.com
                name:
                  type: string
                  example: John Doe
      responses:
        '201':
          description: User created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '400':
          $ref: '#/components/responses/BadRequest'

components:
  schemas:
    User:
      type: object
      properties:
        id:
          type: string
          format: uuid
        email:
          type: string
          format: email
        name:
          type: string
        createdAt:
          type: string
          format: date-time

    Pagination:
      type: object
      properties:
        page:
          type: integer
        limit:
          type: integer
        total:
          type: integer

  responses:
    Unauthorized:
      description: Authentication required
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
                example: Unauthorized

    BadRequest:
      description: Invalid request
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
              details:
                type: array
                items:
                  type: string

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

security:
  - bearerAuth: []

API Documentation Structure

# User API

## Authentication

All API requests require authentication using a Bearer token:

Authorization: Bearer YOUR_API_KEY

Get your API key from the [dashboard](https://dashboard.example.com).

## Base URL

https://api.example.com/v1

## Rate Limiting

- 100 requests per minute per API key
- 1000 requests per hour per API key

Rate limit headers:

X-RateLimit-Limit: 100 X-RateLimit-Remaining: 99 X-RateLimit-Reset: 1640000000

## Errors

Standard HTTP status codes:

| Code | Meaning |
|------|---------|
| 200 | Success |
| 201 | Created |
| 400 | Bad Request - Invalid parameters |
| 401 | Unauthorized - Missing or invalid API key |
| 403 | Forbidden - Insufficient permissions |
| 404 | Not Found |
| 429 | Too Many Requests - Rate limit exceeded |
| 500 | Internal Server Error |

Error response format:
```json
{
  "error": "Invalid email format",
  "code": "VALIDATION_ERROR",
  "details": {
    "field": "email",
    "message": "Must be a valid email address"
  }
}

Endpoints

List Users

GET /users

Returns a paginated list of users.

Query Parameters:

Example Request:

curl -X GET "https://api.example.com/v1/users?page=1&limit=20" \
  -H "Authorization: Bearer YOUR_API_KEY"

Example Response:

{
  "data": [
    {
      "id": "usr_123",
      "email": "john@example.com",
      "name": "John Doe",
      "createdAt": "2024-01-22T10:30:00Z"
    }
  ],
  "pagination": {
    "page": 1,
    "limit": 20,
    "total": 100,
    "pages": 5
  }
}

Create User

POST /users

Creates a new user.

Request Body:

{
  "email": "john@example.com",
  "name": "John Doe",
  "role": "user"
}

Parameters:

Example Request:

curl -X POST "https://api.example.com/v1/users" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "john@example.com",
    "name": "John Doe"
  }'

Example Response:

{
  "id": "usr_123",
  "email": "john@example.com",
  "name": "John Doe",
  "role": "user",
  "createdAt": "2024-01-22T10:30:00Z"
}

SDKs

JavaScript / TypeScript

npm install @example/api-client

import { ExampleAPI } from '@example/api-client'

const client = new ExampleAPI('YOUR_API_KEY')

// List users
const users = await client.users.list({ page: 1, limit: 20 })

// Create user
const user = await client.users.create({
  email: 'john@example.com',
  name: 'John Doe'
})

Python

pip install example-api

from example_api import Client

client = Client('YOUR_API_KEY')

# List users
users = client.users.list(page=1, limit=20)

# Create user
user = client.users.create(
    email='john@example.com',
    name='John Doe'
)

Webhooks

Subscribe to events via webhooks:

{
  "url": "https://yourdomain.com/webhook",
  "events": ["user.created", "user.updated", "user.deleted"]
}

Webhook payload:

{
  "event": "user.created",
  "timestamp": "2024-01-22T10:30:00Z",
  "data": {
    "id": "usr_123",
    "email": "john@example.com"
  }
}

Changelog

v1.1.0 (2024-01-22)

• Added sort and order parameters to list endpoints
• Improved error messages

v1.0.0 (2024-01-01)

• Initial release

---

## Phase 2: User Guides

### Structure

```markdown
# Getting Started Guide

## What You'll Learn

In this guide, you'll learn how to:
- Set up your account
- Create your first project
- Invite team members
- Deploy to production

**Time required:** 15 minutes

## Prerequisites

Before you begin, make sure you have:
- [ ] An account (sign up at example.com)
- [ ] Node.js 18+ installed
- [ ] Basic command line knowledge

## Step 1: Create a Project

1. Log in to your [dashboard](https://dashboard.example.com)
2. Click **New Project**
3. Enter your project name
4. Select a region (choose the one closest to your users)
5. Click **Create**

![Create Project Screenshot](./images/create-project.png)

**Tip:** You can create up to 5 projects on the free plan.

## Step 2: Install the CLI

Open your terminal and run:

```bash
npm install -g @example/cli

Verify installation:

example --version

You should see: example CLI v1.0.0

Step 3: Authenticate

Log in to your account:

example login

This will open your browser. Click Authorize to continue.

Step 4: Deploy Your App

Navigate to your app directory:

cd my-app

Deploy:

example deploy

Your app will be live at https://your-app.example.com

Next Steps

• Configure custom domains
• Set up environment variables
• Add team members

Troubleshooting

"Command not found: example"

Solution: Make sure npm's global bin directory is in your PATH.

Run:

npm config get prefix

Add /bin to your PATH.

"Authentication failed"

Solution:

1. Log out: example logout
2. Log in again: example login
3. Make sure you're using the correct account

Need Help?

• Documentation
• Community Forum
• Support

---

## Phase 3: Tutorials

### Tutorial Structure

```markdown
# Build a Todo App with Example Framework

## What You'll Build

In this tutorial, you'll build a fully functional todo app with:
- ✅ Add, edit, and delete todos
- ✅ Mark todos as complete
- ✅ Filter by status
- ✅ Persist data to database

**Final result:** [Live Demo](https://todo-demo.example.com)

## Prerequisites

- Node.js 18+
- Basic JavaScript knowledge
- 30 minutes

## Step 1: Set Up Project

Create a new project:

```bash
npx create-example-app my-todo-app
cd my-todo-app
npm install

Start the dev server:

npm run dev

Open http://localhost:3000. You should see a welcome page.

Step 2: Create Todo Component

Create components/Todo.jsx:

export function Todo({ todo, onToggle, onDelete }) {
  return (
    <div className="todo">
      <input type="checkbox" checked={todo.completed} onChange={() => onToggle(todo.id)} />
      <span className={todo.completed ? 'completed' : ''}>{todo.text}</span>
      <button onClick={() => onDelete(todo.id)}>Delete</button>
    </div>
  )
}

What's happening here:

• onToggle marks the todo as complete/incomplete
• onDelete removes the todo
• CSS class completed styles finished todos

Step 3: Create TodoList Component

Create components/TodoList.jsx:

import { useState } from 'react'
import { Todo } from './Todo'

export function TodoList() {
  const [todos, setTodos] = useState([])
  const [newTodo, setNewTodo] = useState('')

  const addTodo = () => {
    if (!newTodo.trim()) return

    setTodos([
      ...todos,
      {
        id: Date.now(),
        text: newTodo,
        completed: false
      }
    ])

    setNewTodo('')
  }

  const toggleTodo = id => {
    setTodos(todos.map(todo => (todo.id === id ? { ...todo, completed: !todo.completed } : todo)))
  }

  const deleteTodo = id => {
    setTodos(todos.filter(todo => todo.id !== id))
  }

  return (
    <div>
      <h1>My Todos</h1>

      <div className="add-todo">
        <input
          value={newTodo}
          onChange={e => setNewTodo(e.target.value)}
          placeholder="What needs to be done?"
          onKeyPress={e => e.key === 'Enter' && addTodo()}
        />
        <button onClick={addTodo}>Add</button>
      </div>

      <div className="todo-list">
        {todos.map(todo => (
          <Todo key={todo.id} todo={todo} onToggle={toggleTodo} onDelete={deleteTodo} />
        ))}
      </div>
    </div>
  )
}

Key concepts:

• useState manages the list of todos
• map renders each todo
• filter removes deleted todos

Step 4: Add Filtering

Update TodoList.jsx:

const [filter, setFilter] = useState('all') // 'all', 'active', 'completed'

const filteredTodos = todos.filter(todo => {
  if (filter === 'active') return !todo.completed
  if (filter === 'completed') return todo.completed
  return true
})

// In JSX:
<div className="filters">
  <button onClick={() => setFilter('all')}>All</button>
  <button onClick={() => setFilter('active')}>Active</button>
  <button onClick={() => setFilter('completed')}>Completed</button>
</div>

<div className="todo-list">
  {filteredTodos.map(todo => (
    <Todo key={todo.id} todo={todo} onToggle={toggleTodo} onDelete={deleteTodo} />
  ))}
</div>

Step 5: Persist to Database

Install Prisma:

npm install @prisma/client
npm install -D prisma
npx prisma init

Define schema in prisma/schema.prisma:

model Todo {
  id        String   @id @default(uuid())
  text      String
  completed Boolean  @default(false)
  createdAt DateTime @default(now())
}

Run migration:

npx prisma migrate dev --name init

Create API route app/api/todos/route.ts:

import { prisma } from '@/lib/db'

export async function GET() {
  const todos = await prisma.todo.findMany()
  return Response.json(todos)
}

export async function POST(request: Request) {
  const { text } = await request.json()

  const todo = await prisma.todo.create({
    data: { text }
  })

  return Response.json(todo)
}

Update TodoList.jsx to use API:

useEffect(() => {
  fetch('/api/todos')
    .then(res => res.json())
    .then(data => setTodos(data))
}, [])

const addTodo = async () => {
  if (!newTodo.trim()) return

  const response = await fetch('/api/todos', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ text: newTodo })
  })

  const todo = await response.json()
  setTodos([...todos, todo])
  setNewTodo('')
}

What You Learned

• ✅ Component composition
• ✅ State management with useState
• ✅ Event handling
• ✅ Conditional rendering
• ✅ API integration
• ✅ Database persistence

Next Steps

• Add due dates to todos
• Implement drag-and-drop reordering
• Add user authentication
• Deploy to production

Full Code

View on GitHub

---

## Phase 4: Reference Documentation

### Component Documentation

```markdown
# Button Component

## Import

```typescript
import { Button } from '@/components/Button'

Usage

<Button variant="primary" size="md" onClick={handleClick}>
  Click me
</Button>

Props

Examples

Primary Button

<Button variant="primary">Save</Button>

Secondary Button

<Button variant="secondary">Cancel</Button>

Danger Button

<Button variant="danger" onClick={handleDelete}>
  Delete
</Button>

Loading State

<Button loading disabled>
  Processing...
</Button>

Full Width

<Button fullWidth>Submit</Button>

Accessibility

• Uses semantic <button> element
• Supports keyboard navigation (Enter, Space)
• Includes proper ARIA attributes when loading
• Meets WCAG AA contrast requirements

Related Components

• IconButton
• LinkButton

---

## Documentation Tools

### Docusaurus (Recommended)

```bash
npx create-docusaurus@latest my-docs classic

cd my-docs
npm start

Structure:

my-docs/
├── docs/              # Documentation markdown files
│   ├── intro.md
│   ├── api/
│   └── guides/
├── blog/              # Blog posts
├── src/
│   └── pages/         # Custom React pages
├── static/            # Images, assets
├── docusaurus.config.js
└── sidebars.js        # Sidebar navigation

Other Tools

• GitBook - Beautiful, easy
• MkDocs - Python, simple
• Mintlify - AI-powered, modern
• ReadMe.io - API-focused
• Notion - Internal docs

Writing Best Practices

✅ DO

Use Active Voice:

✅ "Click the button to save"
❌ "The button should be clicked to save"

Be Concise:

✅ "Returns user data"
❌ "This endpoint will return the data associated with the user"

Use Examples:

✅ "Set `timeout` to 5000 (5 seconds)"
❌ "Set the timeout parameter"

Break Up Long Content:

✅ Use headings, lists, code blocks
❌ Long paragraphs of text

Include Error Handling:

✅ Show common errors and solutions
❌ Only show happy path

❌ DON'T

• Use jargon without explanation
• Assume knowledge
• Write from your perspective ("we", "our")
• Skip error cases
• Let docs get stale

Documentation Checklist

Getting Started

• Installation instructions
• Quick start guide
• Hello World example
• Next steps

API Documentation

• Authentication explained
• All endpoints documented
• Request/response examples
• Error codes listed
• Rate limits explained
• SDKs documented

Guides

• Common use cases covered
• Step-by-step tutorials
• Screenshots/videos included
• Troubleshooting section

Reference

• All parameters documented
• Types specified
• Default values listed
• Examples provided

Maintenance

• Versioned
• Changelog maintained
• Broken links checked
• Reviewed quarterly

Related Resources

Skills:

• api-designer - API documentation
• frontend-builder - Component documentation
• ux-designer - User guides

Tools:

• Docusaurus
• Swagger/OpenAPI
• GitBook
• Mintlify

Great docs = happy developers = successful product. 📖