The Developer's Guide to API Versioning (What Nobody Tells You Until It's Too Late)

Breaking changes are inevitable. User schemas evolve. Response formats get rationalized. Fields get renamed for consistency. The question isn't whether your API will break clients — it's how gracefully you handle it when it does. Most teams have this conversation too late: after an important client is already broken, two versions behind, submitting angry support tickets. The three approaches Path versioning ( /v1/users , /v2/users ) is the most common and usually the right choice for public APIs. Versions are explicit, easy to route, easy to deprecate. The downside: you end up maintaining multiple active versions simultaneously. Header versioning ( Accept: application/vnd.api+json;version=2 ) keeps URLs clean but makes versioning invisible in browser address bars and API documentation. Good for internal APIs where you control all consumers. Query parameter versioning ( /users?version=2 ) is easy to implement but easy to forget and easy to misuse. Generally the weakest choice. What actu