Web Development Best Practices: Code Quality and Maintenance
Web development best practices increase code quality, maintainability, and team efficiency. This guide covers code organization, naming conventions, testing, and documentation best practices.
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Project Structure and Organization
Feature-based structure: Separate folder for each feature. Common folders like components/, pages/, hooks/, utils/, services/.
Colocation: Keep related files together. Button component with Button test and Button style in same folder.
Naming convention: File names kebab-case (user-profile.tsx), component names PascalCase (UserProfile), function names camelCase (getUserProfile).
Import ordering: External (react, next) → Internal (components, utils) → Relative (./, ../). Automatic sorting with ESLint import/order.
Barrel exports: Export from folder with index.ts. Clean imports like import { Button, Input } from '@/components'.
Code Quality
DRY (Don't Repeat Yourself): Extract repeated code as function/component. But avoid premature abstraction.
SOLID principles: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion.
KISS (Keep It Simple, Stupid): Prefer simple solution. Avoid over-engineering.
YAGNI (You Aren't Gonna Need It): Don't add feature that's not needed now. Add when needed.
Code review: Every change should go through review. Constructive feedback. Knowledge sharing with pair programming.
Testing Best Practices
Test pyramid: Unit test (many), integration test (medium), E2E test (few). Each level has different purpose and cost.
Unit test: Function and component tests. Jest, Vitest. Fast and isolated. Isolate dependencies with mocks.
Integration test: Test multiple modules working together. API endpoints, database queries.
E2E test: Test user flows. Playwright, Cypress. Slow but high confidence. For critical flows (login, checkout).
Test coverage: Target 80%+ coverage. But don't force 100% coverage. Quality > quantity.
Documentation Best Practices
README: Project description, installation, usage, contributing. First impression and onboarding.
Code comments: Explain 'why' not 'what'. Comment for complex logic. Prefer self-documenting code.
API documentation: OpenAPI/Swagger. Every endpoint, parameter, response, and error code documented.
Architecture Decision Records (ADR): Document architectural decisions. Why was this technology chosen?
Changelog: Document changes of each release. Semantic versioning (major.minor.patch).
Performance Best Practices
Image optimization: WebP/AVIF format, lazy loading, responsive images, CDN.
Code splitting: Route-based and component-based splitting. Reduce bundle size with lazy loading.
Caching: HTTP cache headers, Service Worker, CDN caching. Long TTL for static assets.
Minification: CSS, JS, HTML minification. Gzip/Brotli compression.
Monitoring: Lighthouse, Web Vitals, RUM. Detect performance regressions.
Security Best Practices
Input validation: Validate all user inputs. Server-side validation is mandatory.
XSS prevention: textContent instead of innerHTML. React/Vue automatic escaping. CSP header.
CSRF protection: CSRF tokens. SameSite cookie attribute.
Authentication: JWT or session-based. Secure, HttpOnly, SameSite cookies.
Dependency security: npm audit, Snyk, Dependabot. Up-to-date and secure dependencies.
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