How do you implement API versioning effectively?

Mid ASP.NET Web API Published: Nov 22, 2025

Quick Answer API versioning effectively: choose strategy (URL path is most common: /api/v1/). Use Microsoft.AspNetCore.Mvc.Versioning package. [ApiVersion("1.0")] on controllers, [MapToApiVersion] on actions. Maintain old versions as long as clients use them. Track version usage via analytics. Deprecate with advance notice and a sunset date. Never break an existing version without a major version bump.

Answer

API versioning ensures backward compatibility and predictable updates.

Common approaches:

URL versioning: /api/v1/resource
Query versioning: ?api-version=1.0
Header versioning: api-version: 1.0

Use the Microsoft.AspNetCore.Mvc.Versioning package and decorate controllers with [ApiVersion("1.0")].

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How do you implement API versioning effectively?

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