Most developers use ChatGPT wrong.
They type "fix this code" and wonder why the output is garbage. The difference between a useless AI response and one that saves you 2 hours? The prompt.
After testing hundreds of prompts on real codebases, here are the 15 that actually changed how I work.
1. Deep Code Review
Review this code for bugs, security issues, performance problems,
and readability. For each issue found, explain: (1) what's wrong,
(2) why it matters, (3) the fix with corrected code.
Prioritize by severity.
Code:
[paste code]
Why it works: The "prioritize by severity" instruction forces the AI to think critically instead of listing trivial issues. I ran this on a simple function and it caught a SQL injection I missed.
2. Stack Trace Decoder
Explain this error stack trace in plain English. Identify:
(1) the root cause, (2) which line in MY code triggered it
(not library code), (3) the fix, (4) how to prevent it.
Stack trace:
[paste error]
Why it works: "Not library code" is the magic phrase. Without it, AI explains the framework internals instead of YOUR bug.
3. Rubber Duck Debugger
I'm stuck on a bug. Let me describe what's happening, and ask
me targeted questions to help me find the root cause. Don't give
me the answer immediately — guide me through the debugging
process like a senior engineer would.
Problem: [describe]
Why it works: Instead of giving you a possibly wrong answer, it asks questions that help YOU find the bug. Like pair programming with a patient senior dev.
4. README Generator
Generate a professional README.md for this project. Include:
project title, description, features list, installation steps,
usage examples with code, configuration options, API reference
(if applicable), contributing guidelines, and license.
Project context: [describe what it does]
Tech stack: [list technologies]
Why it works: One prompt, complete README. Saves 30-60 minutes every time.
5. Unit Test Generator
Write comprehensive unit tests for this function/class. Include:
happy path, edge cases, error cases, boundary values, and
null/undefined inputs. Use [testing framework].
Aim for >90% branch coverage.
Code:
[paste code]
Why it works: "Branch coverage" forces the AI to think about code paths, not just obvious test cases.
6. Security Audit
Perform a security audit on this code. Check for: SQL injection,
XSS, CSRF, authentication bypass, insecure deserialization,
sensitive data exposure, broken access control, and dependency
vulnerabilities. Rate each finding by severity
(Critical/High/Medium/Low).
Code:
[paste code]
Why it works: The severity rating makes the output actionable. I ran this on production code and found 3 Medium issues missed in code review.
7. PR Description Generator
Write a pull request description for these changes:
[describe changes or paste diff summary]
Include: Summary (what and why), Changes (bullet list),
Testing (what was tested), Screenshots (if UI),
Checklist (tests pass, docs updated, no breaking changes).
Why it works: Never write a PR description manually again. Consistent format every time.
8. Dockerfile Optimizer
Optimize this Dockerfile for: smaller image size, faster builds,
better caching, and security. Show the optimized version with
comments explaining each improvement.
Current Dockerfile:
[paste]
Why it works: Most Dockerfiles are bloated. This prompt typically cuts image size by 40-60%.
9. API Contract Designer
Design a RESTful API for: [describe the feature]
For each endpoint provide: method, path, request/response
schemas (JSON), status codes, pagination strategy,
authentication requirements, and rate limiting recommendations.
Why it works: Gets you from idea to API spec in 2 minutes instead of 2 hours.
10. Error Message Translator
I got this error: "[paste error message]"
Context: [language/framework], [what I was trying to do]
Explain: (1) what this error means in simple terms,
(2) the 3 most common causes, (3) how to fix each one,
(4) how to prevent it.
Why it works: Giving context about what you were doing helps the AI narrow down the actual cause instead of listing generic possibilities.
11. Database Schema Designer
Design a database schema for: [describe the domain]
Requirements: [list key features]
Provide: (1) table definitions with columns and types,
(2) relationships and foreign keys, (3) indexes for common
queries, (4) the SQL CREATE statements, (5) example queries
for the top 5 use cases.
Why it works: The "example queries" part validates the schema design immediately.
12. Git Commit Message Writer
Write a clear, conventional commit message for these changes:
[describe what changed and why]
Format: type(scope): subject
Body: what and why (not how)
Footer: breaking changes, issue references
Types: feat, fix, docs, style, refactor, test, chore
Why it works: Consistent commit history without the mental overhead.
13. Code Smell Detector
Identify all code smells in this code. For each smell, name
the pattern (God Object, Feature Envy, Long Method, etc.),
explain why it's problematic, and show the refactored version.
Code:
[paste code]
Why it works: Naming the specific anti-pattern forces the AI to apply real software engineering principles, not just cosmetic suggestions.
14. Technical Spec Writer
Write a technical specification for: [describe feature]
Include: Overview, Goals/Non-Goals, Technical Approach,
Data Model Changes, API Changes, Migration Plan,
Testing Strategy, Rollout Plan, Open Questions.
Why it works: The Goals/Non-Goals section is crucial — it prevents scope creep before you write a single line of code.
15. Input Validation Generator
Generate comprehensive input validation for these fields:
[list fields with expected types/formats]
Include: type checking, length limits, format validation (regex),
sanitization, and clear error messages.
Use [language/framework].
Why it works: Input validation is tedious but critical. This generates production-ready validation in seconds.
The Pattern You Should Notice
Every prompt above has three things in common:
- Context — tells the AI what you're working with
- Structure — tells the AI exactly what format you want
- Specificity — "review for bugs, security, and performance" beats "fix this"
Master these three principles and any prompt you write will produce 10x better results.
Want More?
These 15 are from my collection of 60 developer-specific prompts covering code review, debugging, documentation, architecture, testing, security, DevOps, productivity, and career.
Free starter kit (10 prompts): https://aiwondershop.gumroad.com/l/qwvhyp
Full vault (60 prompts): https://aiwondershop.gumroad.com/l/ai-prompt-vault
