🎁 FREE: 5 AI Prompts Every Developer Needs in 2026
Stop wasting time writing mediocre AI prompts. Here are 5 battle-tested prompts that actually work — copy, paste, and get results.
These prompts are designed for developers who use Claude, GPT-4, or any other LLM daily.
---
1. CODE REVIEW PROMPT
Review this code for:1. Bugs and potential runtime errors2. Security vulnerabilities (injection, XSS, data exposure)3. Performance issues (N+1 queries, memory leaks, unnecessary re-renders)4. Code style and readability improvements
Code: [PASTE YOUR CODE HERE]
Format your response as:- CRITICAL: issues that must be fixed- WARNING: issues that should be fixed- SUGGESTION: nice-to-have improvements
Why it works: Forces the AI to categorize issues by severity, so you fix the most important things first.
---
2. DEBUG ASSISTANT PROMPT
I have a bug in my [LANGUAGE/FRAMEWORK] application.
Expected behavior: [WHAT SHOULD HAPPEN]Actual behavior: [WHAT ACTUALLY HAPPENS]Error message (if any): [ERROR]
Relevant code: [PASTE CODE]
Steps I've already tried:- [STEP 1]- [STEP 2]
Help me debug this step-by-step. Start with the most likely cause.
Why it works: Provides structured context so the AI doesn't ask 10 follow-up questions.
---
3. ARCHITECTURE DECISION PROMPT
I need to choose an architecture for:- Project type: [web app / mobile app / API / microservice]- Expected scale: [users, requests/sec]- Team size: [number]- Timeline: [weeks/months]
Compare these approaches:1. [Option A]2. [Option B]
For each, provide: Pros and cons, when to use vs. when to avoid, implementation complexity (1-10), long-term maintenance cost (1-10).
Give your recommendation with reasoning.
Why it works: Gets you a structured comparison instead of a generic "it depends" answer.
---
4. UNIT TEST GENERATOR PROMPT
Write comprehensive unit tests for this function/class:
[PASTE CODE]
Requirements:- Test framework: [Jest / pytest / XCTest / etc.]- Cover: happy path, edge cases, error cases- Use descriptive test names (should_returnX_when_Y format)- Include at least one test for boundary conditions- Mock external dependencies
Why it works: Specifying coverage requirements ensures thorough tests, not just one happy-path test.
---
5. LEGACY CODE EXPLAINER PROMPT
Explain this code as if I'm a mid-level developer joining the team:
[PASTE CODE]
Provide:1. High-level summary (2-3 sentences)2. Step-by-step walkthrough of the logic3. Why it was likely written this way4. Potential issues or technical debt5. How to safely modify or extend it
Why it works: The "joining the team" framing produces practical, team-oriented explanations.
---
WANT 100+ MORE PROMPTS?
Check out my AI Agent Toolkit — 8 ready-made AI agents with system prompts, tools, and workflows:https://boosty.to/swiftuidev
More digital tools for developers and freelancers:https://pease163.github.io/digital-products/
---
Created by Daniil Kornilov — iOS Developer & Digital Product CreatorTwitter: @peasee163 | GitHub: Pease163
These prompts are designed for developers who use Claude, GPT-4, or any other LLM daily.
---
1. CODE REVIEW PROMPT
Review this code for:1. Bugs and potential runtime errors2. Security vulnerabilities (injection, XSS, data exposure)3. Performance issues (N+1 queries, memory leaks, unnecessary re-renders)4. Code style and readability improvements
Code: [PASTE YOUR CODE HERE]
Format your response as:- CRITICAL: issues that must be fixed- WARNING: issues that should be fixed- SUGGESTION: nice-to-have improvements
Why it works: Forces the AI to categorize issues by severity, so you fix the most important things first.
---
2. DEBUG ASSISTANT PROMPT
I have a bug in my [LANGUAGE/FRAMEWORK] application.
Expected behavior: [WHAT SHOULD HAPPEN]Actual behavior: [WHAT ACTUALLY HAPPENS]Error message (if any): [ERROR]
Relevant code: [PASTE CODE]
Steps I've already tried:- [STEP 1]- [STEP 2]
Help me debug this step-by-step. Start with the most likely cause.
Why it works: Provides structured context so the AI doesn't ask 10 follow-up questions.
---
3. ARCHITECTURE DECISION PROMPT
I need to choose an architecture for:- Project type: [web app / mobile app / API / microservice]- Expected scale: [users, requests/sec]- Team size: [number]- Timeline: [weeks/months]
Compare these approaches:1. [Option A]2. [Option B]
For each, provide: Pros and cons, when to use vs. when to avoid, implementation complexity (1-10), long-term maintenance cost (1-10).
Give your recommendation with reasoning.
Why it works: Gets you a structured comparison instead of a generic "it depends" answer.
---
4. UNIT TEST GENERATOR PROMPT
Write comprehensive unit tests for this function/class:
[PASTE CODE]
Requirements:- Test framework: [Jest / pytest / XCTest / etc.]- Cover: happy path, edge cases, error cases- Use descriptive test names (should_returnX_when_Y format)- Include at least one test for boundary conditions- Mock external dependencies
Why it works: Specifying coverage requirements ensures thorough tests, not just one happy-path test.
---
5. LEGACY CODE EXPLAINER PROMPT
Explain this code as if I'm a mid-level developer joining the team:
[PASTE CODE]
Provide:1. High-level summary (2-3 sentences)2. Step-by-step walkthrough of the logic3. Why it was likely written this way4. Potential issues or technical debt5. How to safely modify or extend it
Why it works: The "joining the team" framing produces practical, team-oriented explanations.
---
WANT 100+ MORE PROMPTS?
Check out my AI Agent Toolkit — 8 ready-made AI agents with system prompts, tools, and workflows:https://boosty.to/swiftuidev
More digital tools for developers and freelancers:https://pease163.github.io/digital-products/
---
Created by Daniil Kornilov — iOS Developer & Digital Product CreatorTwitter: @peasee163 | GitHub: Pease163
ai prompts
developer tools
free
coding