Code Review
Review Categories
1. Security Review
Check for:
- SQL injection vulnerabilities
- XSS (Cross-Site Scripting)
- Command injection
- Insecure deserialization
- Hardcoded secrets/credentials
- Improper authentication/authorization
- Insecure direct object references
2. Performance Review
Check for:
- N+1 queries
- Missing database indexes
- Unnecessary re-renders (React)
- Memory leaks
- Blocking operations in async code
- Missing caching opportunities
- Large bundle sizes
3. Code Quality Review
Check for:
- Code duplication (DRY violations)
- Functions doing too much (SRP violations)
- Deep nesting / complex conditionals
- Magic numbers/strings
- Poor naming
- Missing error handling
- Incomplete type coverage
4. Testing Review
Check for:
- Missing test coverage for new code
- Tests that don't test behavior
- Flaky test patterns
- Missing edge cases
- Mocked external dependencies
Review Output Format
## Code Review Summary
### 🔴 Critical (Must Fix)
- **[File:Line]** [Issue description]
- **Why:** [Explanation]
- **Fix:** [Suggested fix]
### 🟡 Suggestions (Should Consider)
- **[File:Line]** [Issue description]
- **Why:** [Explanation]
- **Fix:** [Suggested fix]
### 🟢 Nits (Optional)
- **[File:Line]** [Minor suggestion]
### ✅ What's Good
- [Positive feedback on good patterns]
Common Patterns to Flag
Security
// BAD: SQL injection
const query = `SELECT * FROM users WHERE id = ${userId}`;
// GOOD: Parameterized query
const query = 'SELECT * FROM users WHERE id = $1';
await db.query(query, [userId]);
Performance
// BAD: N+1 query
users.forEach(async user => {
const posts = await getPosts(user.id);
});
// GOOD: Batch query
const userIds = users.map(u => u.id);
const posts = await getPostsForUsers(userIds);
Error Handling
// BAD: Swallowing errors
try {
await riskyOperation();
} catch (e) {}
// GOOD: Handle or propagate
try {
await riskyOperation();
} catch (e) {
logger.error('Operation failed', { error: e });
throw new AppError('Operation failed', { cause: e });
}
Review Checklist
- [ ] No hardcoded secrets
- [ ] Input validation present
- [ ] Error handling complete
- [ ] Types/interfaces defined
- [ ] Tests added for new code
- [ ] No obvious performance issues
- [ ] Code is readable and documented
- [ ] Breaking changes documented