JavaScript Code Review Checklist: Key Steps for Better Code

Happy New Year 2025! Start the year strong by focusing on clean, efficient, and maintainable JavaScript code. Code reviews are key to guaranteeing quality, reducing bugs, and improving long-term project success.

This checklist highlights essential areas such as styling, error handling, performance, security, and accessibility, providing actionable steps for effective reviews.

1. Style and Formatting

Consistent style and formatting make code easier to read and maintain.

• Follow a style guide like Airbnb or Google
• Use tools like Prettier for automated formatting
• Stick to clear naming conventions (camelCase for variables, PascalCase for classes)

2. Readability and Maintainability

Readable code is easier to understand and work with.

• Keep functions and modules focused on a single responsibility
• Add clear comments and documentation (e.g., JSDoc)
• Avoid duplicate code (follow the DRY principle)

3. Error Handling

Good error handling prevents crashes and improves user experience.

• Use try-catch blocks for critical operations
• Create custom error classes for clarity
• Provide clear and helpful error messages

4. Performance Optimization

Efficient code improves application speed and responsiveness.

• Use optimized loops and array methods
• Implement lazy loading for better load times
• Manage async operations effectively

5. Security Best Practices

Security is essential to protect data and maintain trust.

• Validate and sanitize user inputs
• Use HTTPS for secure data transmission
• Keep dependencies up to date

6. Testing Strategy

Testing ensures your code works as expected.

• Write unit tests for individual functions
• Run integration tests for module interactions
• Aim for good test coverage

7. Version Control Best Practices

Good version control keeps collaboration smooth.

• Write clear and descriptive commit messages
• Follow a branching strategy like Gitflow
• Review code changes before merging

8. Dependency Management

Dependencies need regular maintenance to avoid risks.

• Keep lock files (e.g., package-lock.json) updated
• Remove unused dependencies
• Ensure third-party licenses align with your project

9. Accessibility Considerations

Accessible applications reach a wider audience.

• Use semantic HTML elements
• Apply ARIA attributes when necessary
• Ensure smooth keyboard navigation

Conclusion

A well-structured code review process guarantees better code quality, improved collaboration, and a more maintainable codebase. Use this checklist to guide your reviews and set your team up for success in 2025.

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Let’s make this year your most successful yet!