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API Versioning Strategies: URL, Header, and Query Parameter Approaches Compared

API versioning is one of those decisions that seems trivial — "just add /v2/" — until you have 50 clients on v1, 30 on v2, and a breaking change you need to roll out. The versioning strategy you choose affects every client integration, every SDK, and every internal team that depends on your API. This guide compares every major API versioning approach and helps you pick the least painful one.

API Versioning Strategies Compared

Strategy Example Pros Cons Best For

URI Path /api/v2/users Most visible, easy to test, easy to route, cache-friendly URL changes; "v2" in URL forever; URL pollution Public APIs, REST APIs, external consumers

Accept Header (Content Negotiation) Accept: application/vnd.api+json;version=2 Clean URLs, no URL versioning, REST purist-friendly Harder to test…