REST API Versioning: A Practical Guide
What is API versioning, really? API versioning is a contract-management strategy: a way to change your API's shape — fields, behavior, response format — without breaking clients who haven't updated yet. The moment your API has more than one consumer you don't fully control — a mobile app sitting in app-store review, a partner integration, a frontend deployed separately from the backend — you can no longer just "change the API." You need a way to run two shapes of the contract simultaneously, so existing clients keep working while new clients get the updated behavior.
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