development.md

Development Guide

Development Environment Setup

Required Tools

• Node.js >= 18.0.0
• MongoDB >= 5.0
• Git
• npm or yarn
• VS Code or Zed (recommended)

VS Code Extensions

• ESLint
• Prettier
• MongoDB for VS Code
• REST Client
• GitLens

Code Style Guide

JavaScript Style Guide

1. Variables

   • Use const for values that won't be reassigned
   • Use let for values that will be reassigned
   • Never use var
   • Use meaningful variable names

2. Functions

   • Use arrow functions for callbacks
   • Use regular functions for methods
   • Use async/await for asynchronous operations

3. Objects

   • Use object destructuring
   • Use object shorthand notation
   • Use computed property names when appropriate

4. Arrays

   • Use array destructuring
   • Use array methods (map, filter, reduce)
   • Use spread operator for array operations

Naming Conventions

1. Files

   • Use kebab-case for file names
   • Use .js extension for JavaScript files
   • Use .test.js for test files

2. Variables and Functions

   • Use camelCase for variables and functions
   • Use PascalCase for classes and components
   • Use UPPER_CASE for constants

3. Database

   • Use snake_case for database fields
   • Use plural form for collection names
   • Use singular form for model names

Testing

Unit Tests

• Test individual functions and components
• Mock external dependencies
• Use Jest for testing framework
• Aim for high test coverage

Integration Tests

• Test API endpoints
• Test database operations
• Test authentication flows
• Test error handling

Running Tests

# Run all tests
npm test

# Run tests with coverage
npm run test:coverage

# Run specific test file
npm test -- path/to/test.js

# Run tests in watch mode
npm test -- --watch

Database

Schema Design

• Use Mongoose schemas
• Define indexes for frequently queried fields
• Use appropriate data types
• Add validation rules

Migrations

• Use migrations for schema changes
• Version control migration files
• Test migrations before applying

Seeding

• Create seed data for development
• Include test cases
• Document seed data structure

API Development

Endpoint Structure

• Use RESTful conventions
• Version APIs
• Use appropriate HTTP methods
• Include proper status codes

Request Validation

• Validate all inputs
• Use Joi for validation
• Return clear error messages
• Handle edge cases

Response Format

{
  "success": true,
  "data": {},
  "meta": {
    "page": 1,
    "limit": 10,
    "total": 100
  }
}

Error Handling

Error Types

• ValidationError
• AuthenticationError
• AuthorizationError
• NotFoundError
• DatabaseError

Error Response Format

{
  "success": false,
  "error": {
    "code": "ERROR_CODE",
    "message": "Error message",
    "details": {}
  }
}

Logging

Log Levels

• ERROR: For errors that need immediate attention
• WARN: For potentially harmful situations
• INFO: For general operational information
• DEBUG: For detailed debugging information

Log Format

{
  "timestamp": "2024-01-01T00:00:00.000Z",
  "level": "info",
  "message": "Operation completed",
  "context": {
    "userId": "123",
    "operation": "create_report"
  }
}

Performance Optimization

Database

• Use appropriate indexes
• Implement pagination
• Use lean queries when possible
• Cache frequently accessed data

API

• Implement rate limiting
• Use compression
• Enable caching headers
• Optimize response payload

Security

Authentication

• Use JWT for authentication
• Implement refresh tokens
• Secure password storage
• Rate limit login attempts

Authorization

• Use role-based access control
• Validate permissions
• Sanitize user inputs
• Prevent SQL injection

Deployment

Environment Variables

• Use .env for local development
• Use environment variables in production
• Never commit sensitive data
• Document all required variables

Build Process

• Use production build
• Minify assets
• Optimize images
• Enable compression

Monitoring

• Set up error tracking
• Monitor performance
• Track user activity
• Set up alerts