Web Development Standards¶

This guide outlines our standards for web development, covering both frontend and backend practices.

Technology Stack¶

Frontend¶

Core Technologies

Framework: Next.js
Language: TypeScript
Styling: Tailwind CSS
State Management: React Query + Zustand
Testing: Jest + React Testing Library

Backend¶

Core Technologies

Framework: NestJS
Language: TypeScript
Database: PostgreSQL
ORM: Prisma
Testing: Jest

Architecture Standards¶

Frontend Architecture¶

graph TD
    A[Pages] --> B[Components]
    B --> C[Hooks]
    C --> D[Services]
    D --> E[API Client]

Project Structure¶

Text Only

src/
├── components/        # Reusable UI components
│   ├── ui/           # Basic UI elements
│   └── features/     # Feature-specific components
├── hooks/            # Custom React hooks
├── lib/              # Utilities and helpers
├── pages/            # Next.js pages
├── services/         # API services
├── styles/           # Global styles
└── types/            # TypeScript definitions

Backend Architecture¶

graph TD
    A[Controllers] --> B[Services]
    B --> C[Repositories]
    C --> D[Database]

Project Structure¶

Text Only
1 2 3 4 5 6	`src/ ├── config/ # Configuration ├── core/ # Core modules ├── modules/ # Feature modules ├── shared/ # Shared resources └── types/ # TypeScript definitions`

Coding Standards¶

TypeScript Guidelines¶

TypeScript
// Use interfaces for objects
interface User {
  id: string;
  name: string;
  email: string;
  role: UserRole;
}

// Use enums for fixed values
enum UserRole {
  ADMIN = 'admin',
  USER = 'user',
}

// Use type for unions/intersections
type UserResponse = User | Error;

React Guidelines¶

TypeScript
// Functional components with TypeScript
interface Props {
  user: User;
  onUpdate: (user: User) => void;
}

const UserProfile: React.FC<Props> = ({ user, onUpdate }) => {
  return (
    <div>
      <h1>{user.name}</h1>
      {/* Component content */}
    </div>
  );
};

API Standards¶

RESTful Endpoints¶

TypeScript
@Controller('users')
export class UsersController {
  @Get()
  findAll(): Promise<User[]> {
    // Implementation
  }

  @Get(':id')
  findOne(@Param('id') id: string): Promise<User> {
    // Implementation
  }

  @Post()
  create(@Body() createUserDto: CreateUserDto): Promise<User> {
    // Implementation
  }
}

Response Format¶

JSON
{
  "data": {
    "id": "123",
    "name": "John Doe"
  },
  "meta": {
    "timestamp": "2025-01-28T10:00:00Z"
  },
  "error": null
}

Testing Standards¶

Frontend Testing¶

TypeScript
describe('UserProfile', () => {
  it('renders user information', () => {
    const user = {
      id: '123',
      name: 'John Doe',
      email: 'john@example.com'
    };

    render(<UserProfile user={user} />);
    expect(screen.getByText(user.name)).toBeInTheDocument();
  });
});

Backend Testing¶

TypeScript
describe('UsersService', () => {
  it('should create a user', async () => {
    const dto = {
      name: 'John Doe',
      email: 'john@example.com'
    };

    const user = await service.create(dto);
    expect(user.name).toBe(dto.name);
  });
});

Performance Standards¶

Frontend Performance¶

Lighthouse score > 90
First Contentful Paint < 1.5s
Time to Interactive < 3.5s
Bundle size < 200KB (initial)

Backend Performance¶

API response time < 100ms
Database queries < 50ms
Memory usage < 512MB
CPU usage < 70%

Security Standards¶

Frontend Security¶

HTTPS only
CSP headers
XSS prevention
CSRF protection
Secure cookie handling

Backend Security¶

Input validation
Request rate limiting
JWT authentication
Role-based access
Data encryption

Documentation Requirements¶

API Documentation¶

TypeScript
/**
 * Create a new user
 * @param createUserDto - User creation data
 * @returns Newly created user
 * @throws ValidationError if data is invalid
 */
@Post()
@ApiOperation({ summary: 'Create user' })
@ApiResponse({ status: 201, type: User })
create(@Body() createUserDto: CreateUserDto): Promise<User> {
  return this.usersService.create(createUserDto);
}

Component Documentation¶

TypeScript
/**
 * UserProfile component displays user information
 * @param user - User object containing profile data
 * @param onUpdate - Callback function when profile is updated
 * @example
 * <UserProfile user={userData} onUpdate={handleUpdate} />
 */
const UserProfile: React.FC<Props> = ...

Deployment Standards¶

Frontend Deployment¶

Build optimization
CDN usage
Cache strategies
Environment configuration
Health monitoring

Backend Deployment¶

Container orchestration
Database migrations
Environment secrets
Logging setup
Monitoring configuration

Quality Checklist¶

Frontend Checklist¶

Backend Checklist¶

Tools and Resources¶

Development Tools¶

VS Code + Extensions
Chrome DevTools
Postman/Insomnia
Docker
Git

Monitoring Tools¶

Sentry
DataDog
Grafana
Prometheus
ELK Stack

Remember to follow these standards for all web development projects. Standards are regularly updated - check back for changes.