API-first is a development approach where an Application Programming Interface (API) is designed and developed *before* any applications that will use it. This means that the API is treated as a product itself, with careful consideration given to its usability, consistency, and developer experience. It commonly involves using specifications like OpenAPI (Swagger) to define the API contract upfront, enabling parallel development of the API and the client applications that will consume it. API-first promotes reusability, scalability, and consistency across different applications and services.
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