AI Prompt Engineering Expert

Instead of: "Build a complete authentication system"

Use:
1. "Create a User schema with Zod validation for email and password"
2. "Implement password hashing with bcrypt in the user service"
3. "Create JWT token generation and verification utilities"
4. "Build login API endpoint with proper error handling"
5. "Add authentication middleware for protected routes"

"Write unit tests for a UserService class that:
1. Creates users with valid email/password
2. Rejects invalid emails (test@, @example, etc.)
3. Enforces password minimum length of 8 characters
4. Handles duplicate email errors
5. Uses Jest with proper mocking of the database

Then implement the UserService to make all tests pass."

"Design the architecture for a multi-tenant SaaS application:
1. Define clear separation between tenants
2. Implement row-level security in PostgreSQL
3. Use discriminated unions in TypeScript for tenant context
4. Show the folder structure and main abstractions
5. Then we'll implement each piece step by step"

"Refactor this Express.js route handler:
[paste code]

Goals:
- Extract business logic into service layer
- Add proper error handling with custom error classes
- Implement request validation with Zod
- Add TypeScript types for all parameters
- Keep the route handler thin (< 10 lines)"

"Context refresh: We're building a Next.js 15 e-commerce app with:
- App Router and React Server Components
- Supabase for database and auth
- Stripe for payments
- Current status: Authentication is complete, now adding product catalog

Next task: Create product listing page with filters..."

Iteration 1: "Create basic product card component"
Iteration 2: "Add image optimization with next/image"
Iteration 3: "Include loading skeleton states"
Iteration 4: "Add error boundaries for failed image loads"
Iteration 5: "Implement responsive design for mobile"

"Create a Next.js 15 Server Component for user dashboard:
- Fetch user data with Supabase client
- Use Suspense for streaming
- Implement proper error boundaries
- Add TypeScript types from Supabase schema
- Follow Next.js App Router conventions
- Include loading.tsx and error.tsx files"

"Build a REST API endpoint for creating blog posts:
- Use Express.js with TypeScript
- Validate input with Zod schema
- Authenticate with JWT middleware
- Store in PostgreSQL with Prisma
- Return proper HTTP status codes (201, 400, 401, 500)
- Include comprehensive error handling
- Add request logging"

"Write a Prisma query that:
- Fetches posts with author info
- Includes comment count (no N+1 queries)
- Filters by published status
- Sorts by creation date descending
- Paginates with cursor-based pagination
- Returns TypeScript-typed results"

"I'm getting this error:
[paste full error stack]

Context:
- Next.js 15 with App Router
- Happens when navigating to /dashboard
- User is authenticated
- Works in development but fails in production

Here's the relevant code:
[paste minimal reproduction]

Analyze the error and suggest fixes."

"This React component re-renders too frequently:
[paste component code]

Problems:
- Re-renders on every keystroke in parent
- Fetches data unnecessarily
- No memoization

Optimize using useMemo, useCallback, and React.memo where appropriate."

"Review this authentication code for security issues:
[paste code]

Check for:
- SQL injection vulnerabilities
- XSS attack vectors
- CSRF protection
- Secure password storage
- JWT implementation best practices
- Input validation gaps"

"Add comprehensive documentation to this module:
[paste code]

Include:
- JSDoc comments for all functions
- TypeScript type annotations
- Usage examples in comments
- Edge case explanations
- Performance considerations
- Error handling documentation"

"Context: I'm building a real-time chat app with WebSocket.

Instruction: Implement reconnection logic that:
- Retries with exponential backoff
- Maintains message queue during disconnection
- Syncs missed messages on reconnect
- Shows connection status to user"

"Build a image carousel component with these constraints:
- No external libraries (vanilla React only)
- Support touch gestures on mobile
- Lazy load images
- Accessible (keyboard navigation, ARIA labels)
- Max bundle size: 5KB gzipped"

"Here are two examples of API error responses in our system:

Example 1: [JSON structure]
Example 2: [JSON structure]

Now create error responses for:
1. Invalid authentication token
2. Resource not found
3. Rate limit exceeded"

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