⚡ TL;DR: The rule that keeps clients alive: you can add fields, never remove or rename them. Make changes additive, version only for true breaks, run side-by-side with a real deprecation policy, and let contract testing catch breakage before users do. Contents The day one field rename took down...
Source: [Dev.to](https://dev.to/sri2614/api-design-evolution-versioning-49f3)