What you'll learn

Requirements change, new features emerge, and business logic evolves — but your API clients expect stability. Breaking changes lead to integration failures, client frustration, and costly emergency fixes. In this course, Designing and Evolving ASP.NET Core 10 Web APIs, you'll gain the ability to design Web APIs that evolve safely over time without breaking existing clients. First, you'll explore the principles of API contracts, learning to distinguish between contractual elements that require versioning and implementation details that can change freely. Next, you'll discover backward-compatible evolution techniques using additive changes, optional fields, and deprecation patterns, as well as how to design versioning strategies that balance stability and maintainability. Finally, you'll learn how to use OpenAPI as a governance tool to detect breaking changes before production and identify common anti-patterns that lead to brittle APIs. When you're finished with this course, you'll have the skills and knowledge of API evolution design needed to build ASP.NET Core Web APIs that adapt gracefully to changing requirements while maintaining backward compatibility and client trust.