API Versioning

Create version change files that transform API data between versions.

Core Concept

Always build latest format, transform backwards automatically.

User on V1.2 ← transformResponse ← Latest (V2.0)
User on V1.2 → transformRequest  → Latest (V2.0)

• Response transforms: Go BACKWARDS (new → old). User expects old format.
• Request transforms: Go FORWARDS (old → new). Handler expects latest format.

Version Flow