Evolve Without Breaking Clients

The pressure A product manager wants to rename customer_id to account_id in Monday’s response because it reads better. Three mobile clients parse the old field and cannot all ship this week. The shortcut will be copied into client code. Decision path Choose additive API evolution unless the contract truly requires a new version. An API contract includes required fields, response meanings, status behavior, auth requirements, pagination rules, and error shapes. Versioning is expensive because every supported version doubles documentation, tests, SDK behavior, monitoring, and support paths. Mature API teams reserve version changes for breaking changes and use additive evolution for…

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