Code Review & Development Prompts for Freelancers

Review this code for security vulnerabilities, performance issues, and best practices. Language/Framework: Node.js / Express API Code context: This is an API endpoint that handles user authentication and returns a JWT token ``` [PASTE YOUR CODE HERE] ``` Review for: 1. Security vulnerabilities (SQL injection, XSS, CSRF, insecure auth) 2. Performance issues (N+1 queries, memory leaks, blocking operations) 3. Error handling (missing try/catch, unhandled promises) 4. Code style and readability 5. Edge cases not handled For each issue found: - Severity: Critical / Warning / Suggestion - Explain WHY it's a problem (not just what's wrong) - Provide a fixed code snippet - Rate overall code quality: 1-10

Help me debug this issue. Language/Framework: React / TypeScript What should happen: When a user clicks the "Save" button, the form data should be submitted to the API and a success toast should appear What actually happens: The form submits but the success toast never appears, and the console shows "TypeError: Cannot read property 'message' of undefined" Error message: TypeError: Cannot read property 'message' of undefined at handleSubmit (Form.tsx:45) Relevant code: ``` [PASTE RELEVANT CODE] ``` Steps I've already tried: 1) Checked that the API returns a response, 2) Added console.log to handleSubmit — it fires, 3) Checked network tab — API call succeeds with 200 Help me: 1. Identify the most likely root cause 2. Explain why the error occurs 3. Provide the fix with code 4. Suggest how to prevent similar issues in the future

Generate technical documentation for a codebase I'm handing off to a client. Project: A custom WordPress plugin for managing real estate listings Tech stack: PHP, WordPress API, MySQL, JavaScript, REST API Main features: Custom post type for listings, advanced search with filters, Google Maps integration, IDX feed import, lead capture forms Generate: 1. README.md with: project overview, installation steps, configuration, folder structure 2. API documentation for 5 main endpoints (list, create, update, delete, search) 3. Database schema overview (key tables and relationships) 4. Environment variables and configuration guide 5. Troubleshooting section (common issues and fixes) 6. Deployment checklist Requirements: - Write for a mid-level developer who hasn't seen this codebase - Include code examples where helpful - Use markdown formatting - Be specific, not vague

Explain a technical concept to a non-technical client. Concept to explain: Why their website needs an SSL certificate and HTTPS, and why I'm recommending they upgrade their shared hosting to a VPS for better performance Client's technical level: Business owner with no technical background — uses "the Google" and calls the browser "the internet" Context: They asked why their website is showing "Not Secure" in the browser and why it loads slowly Requirements: - Use analogies and everyday language (no jargon) - Explain the "why it matters to their business" not just the technical what - Include the cost/benefit so they can make a decision - Suggest specific action items - Under 200 words - Tone: patient, helpful teacher - Do NOT be condescending

Write a technical proposal for a freelance development project. Client's request: Build a custom CRM for a real estate agency with 15 agents Requirements: Contact management, deal pipeline, email integration, reporting dashboard, mobile-friendly, role-based access My recommended approach: Next.js frontend, Supabase backend (PostgreSQL + Auth), hosted on Vercel, with SendGrid for email Budget range: $15,000 - $20,000 Write a technical proposal including: 1. Executive summary (non-technical, for the decision maker) 2. Proposed architecture (with diagram description) 3. Technology choices with justification (why this stack) 4. Feature breakdown (MVP vs Phase 2) 5. Timeline (phased with milestones) 6. Hosting and maintenance costs (monthly ongoing) 7. Risks and mitigations - 600-800 words - Balance technical detail with business language

Generate comprehensive unit tests for this function. Language: TypeScript Testing framework: Jest Function to test: ``` [PASTE YOUR FUNCTION HERE] ``` Generate tests covering: 1. Happy path (expected inputs → expected outputs) 2. Edge cases (empty inputs, null, undefined, boundary values) 3. Error cases (invalid inputs, API failures) 4. Type checking (wrong types passed) For each test: - Descriptive test name (describe what it tests, not how) - Arrange → Act → Assert pattern - Include mock setup if needed - Comments explaining the test's purpose