TLDR
API-FIRST is an approach of defining your API specification before jumping into the development phase. With an API-first approach, instead of starting with code, you could start with design, planning, mocks, and tests. The specification is shared internally, as a general to-do list for the project teams to work on independently. With no dependency on other departments, frontend and backend teams can work together, simultaneously, towards a mutual goal. By doing so, the application life cycle is trimmed, saving cost and time. And since you already have a defined spec, it can easily be used as the basis for your customer documentation after publication.via the TL;DR App
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