Code ReviewChecklistPull RequestReview ChecklistSoftware Quality

Code Review Checklist: Pull Request Guidelines

Code review checklist for logic, security, performance, tests, documentation and best practices.

schutzgeist

July 5, 2026

Updated July 5, 2026

4 min read

Code Review Checklist

A structured checklist helps you conduct code reviews consistently and efficiently. This article provides a comprehensive checklist covering every aspect of a pull request.

In a Nutshell

Code review checklist: verify logic, security, performance, tests, documentation, and architecture. Keep PRs small, write clear descriptions, and offer constructive feedback—these are the keys to success.

Overview

Code review checklists are structured lists of review points that ensure all relevant aspects of a pull request are examined systematically. They help reviewers maintain consistent quality standards and guide authors toward the most important changes. A solid checklist covers functional correctness, security, performance, test coverage, documentation, and architecture.

The Checklist

1. PR Description and Context

Clear description: What changed and why?
Issue link: Ticket or task is referenced
Testing strategy: How was this tested?
Screenshots: Included for UI changes
Breaking changes: Documented if present

2. Logic and Functionality

Correctness: Does the code do what it should?
Edge cases: Boundary and error cases handled
Error handling: Exceptions handled appropriately
Input validation: All inputs validated
Resource cleanup: Files and connections closed properly

3. Security

SQL injection: Parameterized queries used
XSS: User input escaped
Authentication: Only authorized access allowed
Secrets: No credentials or sensitive data in code
Input validation: All inputs validated

4. Performance

Database queries: N+1 problems avoided
Caching: Applied where appropriate
Algorithm: Efficient algorithm chosen
Memory leaks: No memory leaks
Async operations: Non-blocking I/O used

5. Code Style and Readability

Naming: Meaningful variable and function names
Functions: Small, single responsibility
Comments: Explain “why,” not “what”
Duplication: DRY principle followed
Linter: No linter errors

6. Tests

Unit tests: New logic covered
Integration tests: API endpoints tested
Edge cases: Tests for boundary conditions
Coverage: Test coverage adequate
Flaky tests: No unreliable tests

7. Documentation

README: Updated if needed
API docs: API changes documented
Inline docs: Complex functions documented
Changelog: Updated
Migration guide: Breaking changes documented

8. Architecture and Design

SOLID: Principles followed
Cohesion: Related code in same module
Coupling: Loose coupling between modules
Abstraction: Correct level of abstraction
Scalability: Design scales with requirements

9. Git Practices

Commit messages: Conventional commits
Branch name: Descriptive branch name
Commits: Logically grouped commits
Merge strategy: Consistent rebase or merge
WIP commits: No work-in-progress commits in final PR

10. CI/CD

Example Review

## Code Review: JWT Authentication

### ✅ Strengths
- Clean separation of auth logic and controller
- Comprehensive unit tests
- Detailed PR description

### ⚠️ Improvements
- Secret should be read from environment variables
- Token validation could be moved to a service
- Integration tests missing for API endpoints

### ❏ Questions
- Why was JWT chosen over OAuth2?
- Is token refresh flow implemented?

### ✏️ Changes Required
- [ ] Read secret from ENV
- [ ] Add integration tests

Prioritization

Priority	Category	Focus
Critical	Security, Logic	Blocks merge
High	Performance, Tests	Should be fixed
Medium	Style, Documentation	Can be addressed later
Low	Nitpicks	Optional

Key Takeaways

Use a structured checklist for consistent reviews
Cover logic, security, performance, tests, and documentation
Prioritize: Critical > High > Medium > Low
Integrate CI/CD as a quality gate
Document breaking changes

FAQ

1. What is a code review checklist?

A structured list of review points that ensures consistent code reviews.

2. What categories should a checklist include?

Logic, security, performance, tests, documentation, architecture, Git practices, and CI/CD.

3. How should feedback be prioritized?

Critical > High > Medium > Low. Critical issues block the merge.

4. What counts as critical?

Security vulnerabilities, logic errors, and missing tests.

5. What should a PR description contain?

What changed, why it changed, how it was tested, screenshots, and any breaking changes.

6. How do you review security?

Check for SQL injection, XSS, authentication issues, hardcoded secrets, and input validation.

7. How do you review performance?

Look for N+1 queries, missing caching, inefficient algorithms, memory leaks, and blocking I/O.

8. What should you check in tests?

Unit tests, integration tests, edge case coverage, overall coverage, and test stability.

9. What should be documented?

README updates, API documentation, inline documentation for complex code, changelog, and migration guides.

10. What Git practices matter?

Conventional commit messages, descriptive branch names, and logically grouped commits.

11. What should pass in CI/CD?

All checks, build, tests, linting, and security scans.

12. How long should a review take?

With a checklist, 15-30 minutes for small pull requests.

13. Should every checklist be customized?

Yes, adapt it to your project and team.

14. How should breaking changes be handled?

Document them, provide a migration guide, and update the changelog.

15. What can be automated?

Linting, security scanning, and testing via CI/CD pipelines.

Continue the Software Quality Learning Path

The next article in the Software Quality learning path covers Static Code Analysis Tools—automated tools for code quality checks like ESLint, SonarQube, and Pylint.