Complete Code Review Checklist - Best Practices Guide

Why Use a Code Review Checklist?

Code reviews are one of the most effective ways to catch bugs, improve code quality, and share knowledge across your team. However, without a structured approach, it's easy to miss critical issues or spend too much time on minor details.

This checklist provides a systematic framework for reviewing code, ensuring you cover all important aspects while keeping reviews efficient and actionable.

The Code Review Checklist

1. Functionality & Logic

Does the code do what it's supposed to do?

Are all acceptance criteria met?

Are edge cases handled properly?

Is error handling comprehensive and appropriate?

Are there any obvious bugs or logic errors?

Does the code handle null/undefined values safely?

2. Code Quality & Readability

Is the code easy to understand?

Are variable and function names descriptive?

Is the code properly formatted and consistent?

Are there clear comments for complex logic?

Is the code DRY (Don't Repeat Yourself)?

Are functions and methods focused and single-purpose?

Is the code complexity reasonable (not overly nested)?

3. Security

Are user inputs validated and sanitized?

Is sensitive data encrypted or properly protected?

Are SQL queries parameterized (no SQL injection)?

Is authentication and authorization properly implemented?

Are there any hardcoded credentials or secrets?

Is HTTPS used for all sensitive communications?

Are file uploads validated and restricted?

4. Performance

Are database queries efficient (no N+1 queries)?

Are large datasets paginated?

Is caching used appropriately?

Are expensive operations avoided in loops?

Are resources (files, connections) properly closed?

Is lazy loading used where appropriate?

5. Testing

Are there tests for new functionality?

Do all tests pass?

Is test coverage adequate (aim for 80%+)?

Are edge cases tested?

Are error scenarios tested?

Are integration tests included where needed?

6. Documentation

Is the PR description clear and complete?

Are complex algorithms or logic documented?

Is API documentation updated (if applicable)?

Are breaking changes clearly documented?

Is the README updated if needed?

7. Architecture & Design

Does the code follow project conventions?

Is the design pattern appropriate?

Are dependencies minimized?

Is the code modular and reusable?

Does it fit well with existing architecture?

Are there any architectural red flags?

8. Error Handling & Logging

Are errors caught and handled gracefully?

Are user-facing error messages helpful?

Is appropriate logging in place?

Are sensitive data excluded from logs?

Is the error handling consistent across the codebase?

9. Dependencies & Libraries

Are new dependencies necessary and justified?

Are dependencies up to date and well-maintained?

Are there any known security vulnerabilities?

Is the bundle size impact acceptable?

Are licenses compatible with your project?

10. Git & Version Control

Are commits atomic and well-described?

Is the branch up to date with main/master?

Are there any merge conflicts?

Is the commit history clean?

Are debugging statements and console.logs removed?

How to Use This Checklist

For Reviewers

Start with the big picture: Understand what the PR is trying to accomplish before diving into details
Prioritize critical issues: Focus on security, functionality, and breaking changes first
Be constructive: Suggest improvements rather than just pointing out problems
Ask questions: If something is unclear, ask for clarification rather than assuming
Automate what you can: Use tools like CodeRaptor to catch common issues automatically

For Code Authors

Self-review first: Go through this checklist before requesting a review
Provide context: Write a clear PR description explaining what and why
Keep PRs small: Smaller PRs are easier to review thoroughly
Respond promptly: Address feedback quickly to keep momentum
Learn from feedback: Use review comments to improve future code

Automate Your Code Review Checklist

While this checklist is comprehensive, manually checking every item on every PR is time-consuming. CodeRaptor can automatically check many of these items for you:

Security vulnerabilities (SQL injection, XSS, etc.)
Performance issues (N+1 queries, inefficient loops)
Code quality problems (complexity, duplication)
Common bugs and logic errors
Missing error handling
Coding standard violations

This frees up reviewers to focus on architecture, business logic, and high-level design decisions that require human judgment.

Ready to automate your code reviews?

CodeRaptor automatically checks your code against this checklist and more, giving you instant feedback on every PR.

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