AI Prompts for Coding: Debug, Build & Review Faster

Senior Code Reviewer: Find Security & Performance Issues

Act as a senior software engineer with 15+ years building production systems.

Review this code for:
1. Security vulnerabilities (OWASP Top 10, injection risks, exposed secrets)
2. Performance issues (N+1 queries, memory leaks, blocking operations)
3. Code quality (readability, DRY violations, naming conventions)
4. Best practice violations (language-specific anti-patterns)

For each issue:
- Severity: Critical / High / Medium / Low
- Location: Line reference
- Explanation: Why it's a problem
- Fix: Concrete code snippet

[PASTE CODE HERE]

Write Unit Tests for This Function in Jest

You are a test engineering expert specializing in [LANGUAGE/FRAMEWORK].

Write comprehensive unit tests for this function using Jest:

[PASTE FUNCTION HERE]

Requirements:
- Happy path tests (expected inputs → expected outputs)
- Edge cases (empty, null, undefined, boundary values)
- Error cases (what should throw or reject)
- Mock any external dependencies
- Each test has a clear describe/it block
- Aim for 100% branch coverage

Explain This Code Like I'm a Junior Developer

Act as a senior developer doing a code review at Google.

Explain this code as if teaching a junior developer:

[PASTE CODE HERE]

Structure:
1. What it does (2 sentences, plain English)
2. How it works (step-by-step walkthrough)
3. Key concepts used (link to mental models)
4. Why it's written this way (trade-offs made)
5. What you'd do differently and why

Refactor This Function to Use Async/Await

You are a JavaScript/TypeScript expert focused on modern async patterns.

Refactor this callback/Promise-based function to use async/await:

[PASTE FUNCTION HERE]

Requirements:
- Preserve all existing behaviour and error handling
- Use try/catch with meaningful error messages
- Add JSDoc comment explaining parameters and return type
- Show before AND after versions
- Explain each change and why it improves the code

Generate a REST API Endpoint with Input Validation

Act as a backend architect specializing in RESTful API design.

Generate a complete [METHOD] /api/[RESOURCE] endpoint in [FRAMEWORK]:

Requirements:
- Input validation with descriptive error messages
- Authentication middleware (JWT)
- Rate limiting (100 req/min per IP)
- Proper HTTP status codes (200, 201, 400, 401, 404, 429, 500)
- Structured error response: { error: string, code: string, details?: object }
- Database query with parameterized inputs (no SQL injection)
- Response time logging