api-versioning-strategy

# API Versioning Strategy Choose and implement API versioning approaches with proper deprecation timelines. ## Versioning Methods | Method | Example | Pros | Cons | |--------|---------|------|------| | URL Path | `/api/v1/users` | Clear, cache-friendly | URL clutter | | Header | `API-Version: 1` | Clean URLs | Hidden, harder to test | | Query | `?version=1` | Easy to use | Not RESTful | ## URL Path Versioning (Recommended) ```javascript const v1Router = require('./routes/v1'); const v2Router = require('./routes/v2'); app.use('/api/v1', v1Router); app.use('/api/v2', v2Router); ``` ## Version Adapter Pattern ```javascript // Transform between versions const v1ToV2 = (v1Response) => ({ data: { type: 'user', id: v1Response.user_id, attributes: { name: v1Response.user_name, email: v1Response.email } } }); ``` ## Deprecation Headers ```javascript app.use('/api/v1', (req, res, next) => { res.setHeader('Deprecation', 'true'); res.setHeader('Sunset', 'Sat, 01 Jun 2025 00:00:00 GMT'); res.setHeader('Link', '</api/v2>; rel="successor-version"'); next(); }); ``` ## Safe vs Breaking Changes **Safe Changes** (no version bump): - Adding optional fields - Adding new endpoints - Adding optional parameters **Breaking Changes** (requires new version): - Removing fields - Changing field types - Restructuring responses - Removing endpoints ## Deprecation Timeline | Phase | Duration | Actions | |-------|----------|---------| | Deprecated | 3 m...