Changelog Maintenance

Overview

Create and maintain structured changelogs that document all notable changes to your project, following industry best practices like Keep a Changelog and Semantic Versioning.

When to Use

• Version history documentation
• Release notes generation
• Breaking changes tracking
• Migration guide creation
• Deprecation notices
• Security patch documentation
• Feature announcements
• Bug fix tracking

CHANGELOG.md Template

````markdown

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

• New feature or capability that has been added
• Can be multiple items

Changed

• Changes in existing functionality
• Updates to how features work

Deprecated

• Features that will be removed in upcoming releases
• Include timeline for removal

Removed

• Features that have been removed
• Previously deprecated features

Fixed

• Bug fixes
• Security patches

Security

• Security vulnerabilities that have been fixed
• Important security updates

[2.1.0] - 2025-01-15

Added

• Added OAuth2 authentication support for GitHub and Google
• New dashboard widget system for customizable layouts
• Bulk operations API for processing multiple records
• Export to Excel functionality with custom templates
• Dark mode theme support across all pages
• WebSocket support for real-time notifications
• GraphQL API alongside existing REST endpoints
• Internationalization support for 10 new languages

- Spanish, French, German, Italian, Portuguese - Japanese, Korean, Chinese (Simplified/Traditional), Arabic

Changed

• Updated user profile page with improved layout and performance
• Migrated from REST to GraphQL for main API endpoints
• Improved error messages with more context and suggestions
• Refactored authentication system for better security
• Updated dependencies to latest versions

- React 18.2.0 → 19.0.0 - Node.js 16.x → 18.x (minimum required version) - PostgreSQL 13 → 14

• Changed default pagination from 20 to 50 items
• Improved search algorithm for 3x faster results

Deprecated

• REST API v1 endpoints (will be removed in v3.0.0)

- Use GraphQL API or REST API v2 instead - Migration guide: [docs/migration-v1-to-v2.md](docs/migration-v1-to-v2.md)

• Legacy authentication tokens (remove by 2025-06-01)

- Replace with JWT tokens

• Old configuration format in config.json

- Use new YAML format in config.yaml

Removed

• Removed deprecated /api/users/list endpoint

- Use /api/v2/users instead

• Removed support for Internet Explorer 11

- Minimum browser versions: Chrome 90+, Firefox 88+, Safari 14+, Edge 90+

• Removed jQuery dependency (now pure JavaScript)
• Removed old dashboard widgets (replaced with new widget system)

Fixed

• Fixed race condition in order processing causing duplicate charges

- Affected versions: 2.0.0 - 2.0.5 - Issue: #1234

• Fixed memory leak in WebSocket connections
• Fixed incorrect timezone handling in date pickers
• Fixed CSV export not including all columns
• Fixed CSRF vulnerability in form submissions (CVE-2025-12345)
• Fixed accessibility issues in navigation menu

- Now fully keyboard navigable - Screen reader friendly

• Fixed mobile responsive issues on iPad Pro
• Fixed SQL injection vulnerability in search (CVE-2025-12346)

- Security Impact: High - Affected Versions: 2.0.0 - 2.0.9 - Recommended Action: Upgrade immediately

Security

• CRITICAL: Fixed SQL injection in user search (CVE-2025-12346)

- Impact: Allows unauthorized database access - Affected: v2.0.0 to v2.0.9 - Action: Upgrade to v2.1.0 immediately

• Fixed XSS vulnerability in comment rendering (CVE-2025-12347)
• Updated all dependencies with known security vulnerabilities
• Implemented rate limiting on all API endpoints
• Added CSRF protection to all forms
• Enabled Content Security Policy headers

[2.0.5] - 2025-01-08

Fixed

• Hotfix: Critical bug causing data loss in export functionality
• Fixed authentication issues with LDAP integration
• Resolved performance degradation with large datasets

Security

• Patched authentication bypass vulnerability (CVE-2025-12344)

[2.0.0] - 2025-01-01

Added

• Complete UI redesign with modern look and feel
• New REST API v2 with better performance
• User roles and permissions system
• Audit logging for all administrative actions
• Email templates customization
• Two-factor authentication (2FA)
• API rate limiting
• Database backup automation

Changed

• BREAKING: Changed API response format from XML to JSON

- All API consumers must update their integration - See migration guide: [docs/api-v1-to-v2.md](docs/api-v1-to-v2.md)

• BREAKING: Renamed database tables for consistency

- user → users - order → orders - Run migration script: npm run migrate:v2

• BREAKING: Changed authentication from session-based to JWT

- Existing sessions will be invalidated - Users need to log in again

• Improved database query performance by 50%
• Updated minimum Node.js version to 16.x

Removed

• BREAKING: Removed support for Node.js 12 and 14
• BREAKING: Removed deprecated configuration options

- USEOLDAUTH - Use JWT authentication - LEGACY_MODE - No longer supported

Migration Guide

From v1.x to v2.0:

1. Update Node.js to version 16 or higher
2. Update your API integration:

```javascript // Old (v1) fetch("/api/users/list") .then((res) => res.text()) .then((xml) => parseXML(xml));

// New (v2) fetch("/api/v2/users") .then((res) => res.json()) .then((data) => console.log(data)); `` ```

1. Run database migrations:

``bash npm run migrate:v2 ``

1. Update environment variables:

```env # Remove USEOLDAUTH=true LEGACY_MODE=true

# Add JWTSECRET=your-secret-key JWTEXPIRES_IN=7d ```

[1.5.2] - 2024-12-15

Fixed

• Fixed pagination bug on user list page
• Resolved timezone issues in reports
• Fixed email notification delays

[1.5.0] - 2024-12-01

Added

• New reporting dashboard
• Custom fields for user profiles
• Webhook support for integrations

Changed

• Improved search performance
• Updated UI components library

[1.0.0] - 2024-10-01

Added

• Initial release
• User management
• Basic API
• Authentication and authorization
• Database migrations
• Unit and integration tests

[Unreleased]: https://github.com/user/repo/compare/v2.1.0...HEAD [2.1.0]: https://github.com/user/repo/compare/v2.0.5...v2.1.0 [2.0.5]: https://github.com/user/repo/compare/v2.0.0...v2.0.5 [2.0.0]: https://github.com/user/repo/compare/v1.5.2...v2.0.0 [1.5.2]: https://github.com/user/repo/compare/v1.5.0...v1.5.2 [1.5.0]: https://github.com/user/repo/compare/v1.0.0...v1.5.0 [1.0.0]: https://github.com/user/repo/releases/tag/v1.0.0

````

Release Notes Template

# Release Notes - Version 2.1.0

**Release Date:** January 15, 2025

**Download:** [v2.1.0](https://github.com/user/repo/releases/tag/v2.1.0)

## 🎉 Highlights

- **OAuth2 Authentication**: Sign in with GitHub and Google
- **GraphQL API**: New GraphQL endpoint alongside REST API
- **Dark Mode**: Full dark mode support across all pages
- **Real-time Notifications**: WebSocket-powered live updates
- **10 New Languages**: Expanded internationalization support

## 📦 What's New

### OAuth2 Authentication

You can now sign in using your GitHub or Google account. Configure OAuth in Settings > Authentication.

// Enable OAuth in your config { "auth": { "providers": ["github", "google"], "github": { "clientId": "your-client-id", "clientSecret": "your-client-secret" } } } ````

GraphQL API

Access your data with GraphQL for more efficient queries:

query GetUser {
  user(id: "123") {
    id
    name
    email
    orders {
      id
      total
      items {
        product {
          name
          price
        }
      }
    }
  }
}

Endpoint: https://api.example.com/graphql Documentation: GraphQL API Docs

Dark Mode

Enable dark mode in Settings > Appearance or use system preferences.


🔧 Improvements

• 3x Faster Search: Improved search algorithm
• Better Error Messages: More helpful error messages with suggestions
• Enhanced Performance: 50% faster page loads
• Mobile Improvements: Better responsive design for tablets

🐛 Bug Fixes

• Fixed race condition in order processing
• Fixed memory leak in WebSocket connections
• Fixed timezone handling in date pickers
• Fixed accessibility issues in navigation

🔒 Security Updates

• CRITICAL: Fixed SQL injection vulnerability (CVE-2025-12346)

- Impact: High - Allows unauthorized database access - Action: Upgrade immediately if using v2.0.0 - v2.0.9

• Fixed XSS vulnerability in comment rendering (CVE-2025-12347)
• Updated dependencies with security patches

📋 Breaking Changes

Deprecated APIs (Removal in v3.0.0)

The following REST API v1 endpoints are deprecated and will be removed in v3.0.0:

Timeline: These endpoints will continue working until June 2025.

Updated Dependencies

• Node.js: Minimum version is now 18.x (was 16.x)
• React: Upgraded to 19.0.0
• PostgreSQL: Minimum version is now 14 (was 13)

📖 Documentation

• [Full Changelog](CHANGELOG.md)
• [API Migration Guide](docs/api-migration.md)
• [Upgrade Guide](docs/upgrade-guide.md)
• API Documentation

🔄 Upgrading

From v2.0.x

# Backup your database first
pg_dump your_database > backup.sql

# Pull latest version
git pull origin main

# Install dependencies
npm install

# Run migrations
npm run migrate

# Restart application
npm start

From v1.x

Please see the [v1 to v2 Migration Guide](docs/v1-to-v2-migration.md) for detailed upgrade instructions.

🙏 Contributors

Thanks to all contributors who made this release possible:

• @contributor1 - OAuth2 implementation
• @contributor2 - GraphQL API
• @contributor3 - Dark mode
• @contributor4 - Performance improvements

📞 Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Documentation: docs.example.com
• Email: [email protected]

🔜 What's Next?

Coming in v2.2.0:

• Advanced analytics dashboard
• Plugin system for extensibility
• Mobile apps (iOS and Android)
• Improved team collaboration features

Stay tuned!

## Semantic Versioning Guide

Version: MAJOR.MINOR.PATCH

MAJOR version: Incompatible API changes MINOR version: Add functionality (backwards-compatible) PATCH version: Backwards-compatible bug fixes

Examples:

• 1.0.0 → 1.0.1: Bug fixes
• 1.0.1 → 1.1.0: New features (backwards-compatible)
• 1.1.0 → 2.0.0: Breaking changes

## Best Practices

### ✅ DO
- Follow Keep a Changelog format
- Use Semantic Versioning
- Document breaking changes prominently
- Include migration guides
- Link to relevant issues/PRs
- Categorize changes (Added, Changed, Fixed, etc.)
- Include security fixes in separate section
- Date all releases (YYYY-MM-DD format)
- Link to release tags
- Document deprecations with timelines
- Include upgrade instructions
- Mention contributors

### ❌ DON'T
- Skip documenting breaking changes
- Forget to update changelog before release
- Mix multiple types in one category
- Use vague descriptions
- Skip dates on releases
- Forget semantic versioning
- Hide security issues

## Resources

- [Keep a Changelog](https://keepachangelog.com/)
- [Semantic Versioning](https://semver.org/)
- [Conventional Commits](https://www.conventionalcommits.org/)
- [Release Drafter](https://github.com/release-drafter/release-drafter)