API Backward Compatibility: Safe Changes, Breaking Changes, and Migration
Maintain API backward compatibility: identify safe vs. breaking changes in JSON responses, use additive versioning, and communicate deprecations clearly.
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Tags: api, compatibility, data
API Backward Compatibility: Safe Changes, Breaking Changes, and Migration Backward compatibility means existing clients continue to work correctly after you deploy a change. Without it, every API release is a coordination exercise — you need every consumer to update simultaneously, or you break them. At scale, that is impossible. Understanding the precise boundary between safe and breaking changes, implementing deprecation patterns that give consumers time to migrate, and using consumer-driven contract tests to detect regressions before production — these are the practical skills this guide covers. Breaking Changes: A Precise Catalog Removing or renaming a field The most common cause of client breakage. Clients that reference fail when you rename it to . The safe migration is to add first…
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