The Prompt Library

Act as an expert React performance engineer. Review the following component and identify all unnecessary re-renders, memory leaks, or missing memoization hooks. Provide a deeply refactored version of the code prioritizing SOLID principles.

Generate a production-ready REST API endpoint in Node.js with Express and TypeScript. Include input validation with Zod, proper error handling with custom error classes, rate limiting middleware, and JSDoc comments. Return the response in a consistent { success, data, error } envelope.

You are a senior database engineer. Analyze the following SQL query and its EXPLAIN plan. Identify performance bottlenecks, suggest index optimizations, and rewrite the query for maximum efficiency. Explain the reasoning behind every change. Target PostgreSQL 16.

Explain the concept of quantum entanglement using only analogies related to cooking or organizing a kitchen. Do not use any scientific jargon. Output the explanation as a clear, three-paragraph short story.

Take the opposing position on the following argument and challenge every assumption using the Socratic method. Ask probing questions, identify logical fallacies, and steelman the counter-argument. Do not concede unless the user provides genuinely irrefutable evidence.

Solve the following multi-step problem by explicitly showing your reasoning at each step. Label each step clearly (Step 1, Step 2, etc.). After reaching the answer, verify it by working backwards from the solution. If the verification fails, identify where the error occurred and correct it.

Extract all dates, names, organizations, and monetary values from the following raw text. Output the result strictly as a minified JSON array of objects. Do not include any conversational text before or after the JSON.

Analyze the following CSV data. Calculate summary statistics for all numeric columns (mean, median, std dev, min, max). Identify the top 3 most significant correlations. Flag any rows that appear to be outliers using the IQR method. Present results as a well-formatted markdown report with tables.

Design a normalized PostgreSQL database schema for the following use case. Include all tables, columns with data types, primary keys, foreign keys, unique constraints, and indexes. Add comments explaining non-obvious design decisions. Output as a valid SQL migration file.

Create a detailed outline for a 2,000-word blog post on the following topic. Include a compelling headline (use power words), meta description (under 155 characters), H2/H3 subheadings, key points per section, one suggested metaphor or analogy per section, and a call-to-action for the conclusion. Optimize for SEO without keyword stuffing.

Write clear, concise technical documentation for the following API endpoint / library / feature. Include: overview, prerequisites, installation steps, usage examples with code snippets, common error scenarios and troubleshooting, and a FAQ. Follow the Diataxis framework (tutorials, how-to guides, reference, explanation).

Generate 20 unique, catchy product names for the following concept. Each name should be: memorable, easy to spell, available as a .com domain (make a best guess), and evoke the product's core value proposition. Organize them into 4 tiers: Safe, Playful, Bold, and Wildcard. Include a one-sentence rationale for each.

Create a detailed fictional world for a story set in the following genre. Include: geography and climate, political structure, economic system, magic/technology system with clear rules and limitations, 3 major factions with conflicting goals, cultural norms, and a central unresolved conflict that could drive a narrative. Output as a structured world bible.

Review the following pull request diff as a senior engineer at a FAANG company. Score it on: correctness, readability, performance, security, and test coverage. For each issue found, categorize it as [CRITICAL], [MAJOR], or [NIT]. Provide the exact line number and a suggested fix. End with an overall verdict: Approve, Request Changes, or Needs Discussion.

Conduct a competitive analysis for the following product or market. Identify the top 5 competitors, their strengths and weaknesses, pricing models, target demographics, and market positioning. Create a SWOT analysis and suggest 3 concrete differentiation strategies. Present as a structured report with tables.

Analyze the following error message, stack trace, and relevant code. Identify the root cause (not just the symptom). Explain why this error occurred in plain English, provide the exact fix with code, and suggest a defensive coding pattern to prevent this class of bug in the future.

I am stuck on a bug. Ask me a series of yes/no clarifying questions to narrow down the issue — like a diagnostic flowchart. Do not guess the answer until you have asked at least 5 questions. After identifying the likely cause, walk me through the fix step-by-step.

Analyze the following code for performance issues. Identify: time complexity of each function, memory allocation hotspots, potential N+1 query problems, unnecessary computations, and blocking operations. Provide an optimized version with Big-O analysis before and after. Include benchmarking suggestions.

Act as a strict but encouraging language tutor for [Target Language]. Conduct our entire conversation in [Target Language] at a CEFR A2 level. Correct my mistakes gently with explanations in English, and ask me follow-up questions to keep the conversation going. Start by asking me about my favorite hobbies.

I want to learn about [Topic]. Explain the core concepts using the Feynman Technique: use simple language, avoid jargon, and provide concrete analogies. Test my understanding by asking me 3 multiple-choice questions at the end of your explanation.

Create a comprehensive, 12-week learning roadmap for mastering [Skill/Technology]. Break down the curriculum week-by-week. For each week, provide 3 actionable milestones, 2 recommended resources (books, courses, or documentation), and a capstone mini-project to prove competence. Assume I have 10 hours a week to dedicate to this.